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At least 415 records · Page 23
All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on Ho4RuBr5 by Materials Project

Ho4RuBr5 crystallizes in the tetragonal P4_2/nnm space group. The structure is three-dimensional. there are three inequivalent Ho sites. In the first Ho site, Ho is bonded to three equivalent Ru and three Br atoms to form a mixture of corner and edge-sharing HoRu3Br3 octahedra. The corner-sharing octahedra tilt angles range from 2–15°. There are two shorter (2.81 Å) and one longer (2.83 Å) Ho–Ru bond lengths. There are one shorter (3.06 Å) and two longer (3.19 Å) Ho–Br bond lengths. In the second Ho site, Ho is bonded to one Ru and five Br atoms to form distorted HoRuBr5 octahedra that share corners with three HoRu3Br3 octahedra and edges with eight HoRuBr5 octahedra. The corner-sharing octahedra tilt angles range from 2–15°. The Ho–Ru bond length is 2.68 Å. There are a spread of Ho–Br bond distances ranging from 2.90–3.22 Å. In the third Ho site, Ho is bonded to one Ru and five Br atoms to form distorted HoRuBr5 octahedra that share a cornercorner with one HoRu3Br3 octahedra and edges with eight HoRuBr5 octahedra. The corner-sharing octahedral tilt angles are 14°. The Ho–Ru bond length is 2.70 Å. There are a spread of Ho–Br bond distances ranging from 2.92–3.19 Å. Ru is bonded to six Ho atoms to form distorted edge-sharing RuHo6 octahedra. There are four inequivalent Br sites. In the first Br site, Br is bonded in a distorted see-saw-like geometry to four Ho atoms. In the second Br site, Br is bonded in a distorted see-saw-like geometry to four Ho atoms. In the third Br site, Br is bonded in a 3-coordinate geometry to three Ho atoms. In the fourth Br site, Br is bonded in a 3-coordinate geometry to three Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho2Ge5Rh3 by Materials Project

Ho2Rh3Ge5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. Ho is bonded in a 8-coordinate geometry to six Rh and ten Ge atoms. There are a spread of Ho–Rh bond distances ranging from 3.17–3.58 Å. There are a spread of Ho–Ge bond distances ranging from 3.04–3.40 Å. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded in a 9-coordinate geometry to four equivalent Ho and five Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.41–2.57 Å. In the second Rh site, Rh is bonded in a 6-coordinate geometry to four equivalent Ho and six Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.50–2.75 Å. There are four inequivalent Ge sites. In the first Ge site, Ge is bonded in a 4-coordinate geometry to four equivalent Ho and four equivalent Rh atoms. In the second Ge site, Ge is bonded in a 5-coordinate geometry to four equivalent Ho, three Rh, and four Ge atoms. There are two shorter (2.69 Å) and two longer (2.95 Å) Ge–Ge bond lengths. In the third Ge site, Ge is bonded in a 2-coordinate geometry to four equivalent Ho, three Rh, and four Ge atoms. Both Ge–Ge bond lengths are 2.69 Å. In the fourth Ge site, Ge is bonded in a 9-coordinate geometry to four equivalent Ho, three Rh, and two Ge atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho2Si5Rh3 by Materials Project

Ho2Rh3Si5 crystallizes in the orthorhombic Ibam space group. The structure is three-dimensional. Ho is bonded in a 1-coordinate geometry to seven Rh and ten Si atoms. There are a spread of Ho–Rh bond distances ranging from 3.08–3.40 Å. There are a spread of Ho–Si bond distances ranging from 2.97–3.21 Å. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded in a 6-coordinate geometry to four equivalent Ho and six Si atoms. There are four shorter (2.44 Å) and two longer (2.59 Å) Rh–Si bond lengths. In the second Rh site, Rh is bonded in a 5-coordinate geometry to five equivalent Ho and five Si atoms. There are a spread of Rh–Si bond distances ranging from 2.35–2.42 Å. There are three inequivalent Si sites. In the first Si site, Si is bonded in a 2-coordinate geometry to four equivalent Ho, three Rh, and two equivalent Si atoms. Both Si–Si bond lengths are 2.51 Å. In the second Si site, Si is bonded in a 9-coordinate geometry to four equivalent Ho, three Rh, and two equivalent Si atoms. In the third Si site, Si is bonded in a 4-coordinate geometry to four equivalent Ho and four equivalent Rh atoms.

36 MATERIALS SCIENCE↗
NASA NTRS1993

Coherent laser radar at 2 microns using solid-state lasers

Coherent laser radar systems using 2-micron Tm- and Tm, Ho-doped solid-state lasers are useful for the remote range-resolved measurement of atmospheric winds, aerosol backscatter, and DIAL measurements of atmospheric water vapor and CO2 concentrations. Recent measurements made with a 2-micron coherent laser radar system, advances in the laser technology, and atmospheric propagation effects on 2-micron coherent lidar performance are described.

Henderson, Sammy W.↗
DOE OSTI2023

Systematic study of short- and long-range correlations in RE 3 TaO 7 weberite-type compounds by neutron total scattering and X-ray diffraction

The atomic structures of the lanthanide tantalates, Ln 3 TaO 7 , series (Ln = Pr, Tb, Dy, Ho, Tm, Yb) were systematically investigated using total scattering techniques. High-energy X-ray and neutron diffraction analysis revealed that the long-range structures can be grouped into three distinct families: (1) ordered Cmcm (Ln = Pr), (2) ordered Ccmm (Ln = Tb, Dy, Ho), and (3) disordered, defect-fluorite Fm$\bar{3}$m (Ln = Ho, Tm, Yb). These findings help to clarify the symmetry discrepancy for the already reported long-range structures in the literature. The short-range analysis of neutron total scattering data via pair distribution functions reveals a high degree of structural heterogeneity across length scales for all compounds, with distinct local atomic arrangements that are not fully captured by the average, long-range structure. The short-range structures at the level of coordination polyhedra are better captured by a set of alternative non-centrosymmetric structural models: (1) C2cm, (2) C222 1 , and (3) C2mm. This establishes a short-range multiferroic character for weberite-type tantalates because ferroelectric interactions compete with magnetic correlations. These ferroelectric interactions are particularly pronounced for the disordered compounds Tm 3 TaO 7 and Yb 3 TaO 7 . In conclusion, the structural differences among the three families are the result of changes in TaO 6 polyhedral tilt (transition between families 1 and 2) and dipolar interactions of off-centered Ta cations (transition between families 2 and 3).

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on K3HoSi3O10 by Materials Project

K3HoSi3O10 crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent K sites. In the first K site, K is bonded in a 1-coordinate geometry to eleven O atoms. There are a spread of K–O bond distances ranging from 2.67–3.32 Å. In the second K site, K is bonded in a 7-coordinate geometry to seven O atoms. There are a spread of K–O bond distances ranging from 2.75–3.07 Å. Ho is bonded to six O atoms to form HoO6 octahedra that share corners with six SiO4 tetrahedra. There are a spread of Ho–O bond distances ranging from 2.20–2.31 Å. There are two inequivalent Si sites. In the first Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent HoO6 octahedra and a cornercorner with one SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 37–42°. There are a spread of Si–O bond distances ranging from 1.61–1.68 Å. In the second Si site, Si is bonded to four O atoms to form SiO4 tetrahedra that share corners with two equivalent HoO6 octahedra and corners with two equivalent SiO4 tetrahedra. The corner-sharing octahedra tilt angles range from 7–53°. There are a spread of Si–O bond distances ranging from 1.60–1.68 Å. There are six inequivalent O sites. In the first O site, O is bonded in a 2-coordinate geometry to two equivalent K, one Ho, and one Si atom. In the second O site, O is bonded in a 2-coordinate geometry to three K, one Ho, and one Si atom. In the third O site, O is bonded in a 4-coordinate geometry to two K, one Ho, and one Si atom. In the fourth O site, O is bonded in a 3-coordinate geometry to one K, one Ho, and one Si atom. In the fifth O site, O is bonded in a 2-coordinate geometry to two K and two Si atoms. In the sixth O site, O is bonded in a distorted single-bond geometry to four K and one Si atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho5(Ge5Rh2)2 by Materials Project

Ho5(Rh2Ge5)2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. there are three inequivalent Ho sites. In the first Ho site, Ho is bonded in a 8-coordinate geometry to four equivalent Rh and twelve Ge atoms. All Ho–Rh bond lengths are 3.22 Å. There are eight shorter (2.98 Å) and four longer (3.36 Å) Ho–Ge bond lengths. In the second Ho site, Ho is bonded in a 12-coordinate geometry to four equivalent Rh and ten Ge atoms. All Ho–Rh bond lengths are 3.33 Å. There are a spread of Ho–Ge bond distances ranging from 3.24–3.35 Å. In the third Ho site, Ho is bonded to four equivalent Rh and eight Ge atoms to form face-sharing HoGe8Rh4 cuboctahedra. All Ho–Rh bond lengths are 3.12 Å. There are a spread of Ho–Ge bond distances ranging from 2.93–3.14 Å. Rh is bonded in a 5-coordinate geometry to five Ho and five Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.45–2.58 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to six Ho, two equivalent Rh, and one Ge atom. The Ge–Ge bond length is 2.47 Å. In the second Ge site, Ge is bonded in a 2-coordinate geometry to five Ho, two equivalent Rh, and one Ge atom. The Ge–Ge bond length is 2.54 Å. In the third Ge site, Ge is bonded in a 2-coordinate geometry to four Ho and two equivalent Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho5(Ge5Ir2)2 by Materials Project

Ho5(Ir2Ge5)2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. there are three inequivalent Ho sites. In the first Ho site, Ho is bonded in a 8-coordinate geometry to four equivalent Ir and twelve Ge atoms. All Ho–Ir bond lengths are 3.23 Å. There are eight shorter (2.97 Å) and four longer (3.36 Å) Ho–Ge bond lengths. In the second Ho site, Ho is bonded to four equivalent Ir and eight Ge atoms to form distorted face-sharing HoGe8Ir4 cuboctahedra. All Ho–Ir bond lengths are 3.13 Å. There are a spread of Ho–Ge bond distances ranging from 2.91–3.10 Å. In the third Ho site, Ho is bonded in a 12-coordinate geometry to four equivalent Ir and ten Ge atoms. All Ho–Ir bond lengths are 3.31 Å. There are a spread of Ho–Ge bond distances ranging from 3.27–3.38 Å. Ir is bonded in a 10-coordinate geometry to five Ho and five Ge atoms. There are a spread of Ir–Ge bond distances ranging from 2.46–2.59 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to six Ho, two equivalent Ir, and one Ge atom. The Ge–Ge bond length is 2.47 Å. In the second Ge site, Ge is bonded in a 2-coordinate geometry to five Ho, two equivalent Ir, and one Ge atom. The Ge–Ge bond length is 2.52 Å. In the third Ge site, Ge is bonded in a 2-coordinate geometry to four Ho, two equivalent Ir, and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.88 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho5(Ge5Os2)2 by Materials Project

Ho5(Os2Ge5)2 crystallizes in the tetragonal P4/mbm space group. The structure is three-dimensional. there are three inequivalent Ho sites. In the first Ho site, Ho is bonded in a 8-coordinate geometry to four equivalent Os and twelve Ge atoms. All Ho–Os bond lengths are 3.27 Å. There are eight shorter (2.98 Å) and four longer (3.38 Å) Ho–Ge bond lengths. In the second Ho site, Ho is bonded to four equivalent Os and eight Ge atoms to form distorted face-sharing HoGe8Os4 cuboctahedra. All Ho–Os bond lengths are 3.12 Å. There are a spread of Ho–Ge bond distances ranging from 2.88–3.11 Å. In the third Ho site, Ho is bonded in a 12-coordinate geometry to four equivalent Os and ten Ge atoms. All Ho–Os bond lengths are 3.30 Å. There are a spread of Ho–Ge bond distances ranging from 3.29–3.39 Å. Os is bonded in a 10-coordinate geometry to five Ho and five Ge atoms. There are a spread of Os–Ge bond distances ranging from 2.44–2.61 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to six Ho, two equivalent Os, and one Ge atom. The Ge–Ge bond length is 2.52 Å. In the second Ge site, Ge is bonded in a 2-coordinate geometry to five Ho, two equivalent Os, and one Ge atom. The Ge–Ge bond length is 2.58 Å. In the third Ge site, Ge is bonded in a 2-coordinate geometry to four Ho, two equivalent Os, and two equivalent Ge atoms. Both Ge–Ge bond lengths are 2.94 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho3(GaNi3)2 by Materials Project

Ho3(Ni3Ga)2 crystallizes in the cubic Im-3m space group. The structure is three-dimensional. Ho is bonded in a 12-coordinate geometry to eight equivalent Ni and four equivalent Ga atoms. There are four shorter (2.74 Å) and four longer (3.03 Å) Ho–Ni bond lengths. All Ho–Ga bond lengths are 3.15 Å. Ni is bonded in a 12-coordinate geometry to four equivalent Ho, six equivalent Ni, and two equivalent Ga atoms. There are four shorter (2.56 Å) and two longer (2.85 Å) Ni–Ni bond lengths. Both Ni–Ga bond lengths are 2.48 Å. Ga is bonded to six equivalent Ho and six equivalent Ni atoms to form a mixture of face and corner-sharing GaHo6Ni6 cuboctahedra.

36 MATERIALS SCIENCE↗
NASA NTRS2015

Advances in High Energy Solid-State Pulsed 2-Micron Lidar Development for Ground and Airborne Wind, Water Vapor and CO2 Measurements

NASA Langley Research Center has a long history of developing 2-micron lasers. From fundamental spectroscopy research, theoretical prediction of new materials, laser demonstration and engineering of lidar systems, it has been a very successful program spanning around two decades. Successful development of 2-micron lasers has led to development of a state-of-the-art compact lidar transceiver for a pulsed coherent Doppler lidar system for wind measurement with an unprecedented laser pulse energy of 250 millijoules in a rugged package. This high pulse energy is produced by a Ho:Tm:LuLiF laser with an optical amplifier. While the lidar is meant for use as an airborne instrument, ground-based tests were carried out to characterize performance of the lidar. Atmospheric measurements will be presented, showing the lidar's capability for wind measurement in the atmospheric boundary layer and free troposphere. Lidar wind measurements are compared to a balloon sonde, showing good agreement between the two sensors. Similar architecture has been used to develop a high energy, Ho:Tm:YLF double-pulsed 2-micron Integrated Differential Absorption Lidar (IPDA) instrument based on direct detection technique that provides atmospheric column CO2 measurements. This instrument has been successfully used to measure atmospheric CO2 column density initially from a ground mobile lidar trailer, and then it was integrated on B-200 plane and 20 hours of flight measurement were made from an altitude ranging 1500 meters to 8000 meters. These measurements were compared to in-situ measurements and National Oceanic and Atmospheric Administration (NOAA) airborne flask measurement to derive the dry mixing ratio of the column CO2 by reflecting the signal by various reflecting surfaces such as land, vegetation, ocean surface, snow and sand. The lidar measurements when compared showed a very agreement with in-situ and airborne flask measurement. NASA Langley Research Center is currently developing a triple-pulsed 2-micron Integrated Differential Absorption Lidar (IPDA) instrument for simultaneous measurement of water vapor and carbon-dioxide column density measurement from an air-borne platform. This presentation will give an overview of the 2 decades of 2-micron coherent and direction detection of laser/lidar development at NASA Langley Research Center and will present the ground and airborne wind and column CO2 measurement intercomparison with in-situ, balloon and flask measurements.

Singh, Upendra N.↗
DOE OSTI2026

Crystal Structures, Optical Behavior, and Magnetic Properties in Hydrated Lanthanide Iron Sulfates

Single crystals of LnFe(SO 4 ) 3 (H 2 O) 2 (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm; compounds 1–11) and LnFe(SO 4 ) 3 (H 2 O) (Ln = Tm, Yb, Lu; compounds 12–14) were synthesized under hydrothermal conditions. Single-crystal X-ray diffraction (SCXRD) analysis revealed that the dihydrated compounds (1–11) crystallize in centrosymmetric (CS) structures, with the lanthanide ions adopting eight-coordinate geometries. In contrast, the monohydrated compounds (12–14) exhibit noncentrosymmetric (NCS) structures, where the lanthanide ions are seven-coordinated. Vibrating sample magnetometry (VSM) confirmed that compounds 2, 4, and 7–11 are paramagnetic below 400 K, with compound 8 displaying the highest magnetic susceptibility. Compounds 1, 5, 6, 13, and 14 show a sharp increase in magnetic susceptibility at Néel temperatures ( T N ) of approximately 72, 76, 70, 58, and 56 K, respectively, indicating antiferromagnetic ordering. High-temperature magnetic susceptibility measurements further support the presence of antiferromagnetic transitions in these compounds. Second harmonic generation (SHG) measurements showed that the noncentrosymmetric Yb (compound 13) and Lu (compound 14) compounds exhibit SHG intensities of 0.3× and 1.6× that of potassium dihydrogen phosphate (KDP), respectively.

anions↗
DOE OSTI2020

Cooperative Ru(4 d )–Ho(4 f ) magnetic ordering and phase coexistence in the 6 H perovskite multiferroic Ba 3 HoRu 2 O 9

We report cooperative magnetic orderings in a 6H-perovskite multiferroic system, Ba 3 HoRu 2 O 9 , via comprehensive neutron powder diffraction measurements. This system undergoes long-range antiferromagnetic ordering at T N1 ~ 50 K with a propagation wave vector of K 1 = (0.5 0 0), a transition temperature much higher than the previously reported one at ~10 K (T N2 ). Both Ru and Ho-moments order simultaneously below T N1 , followed by spin-reorientations at lower temperatures, demonstrating strong Ru(4d)-Ho(4f) magnetic correlation. Below T N1 another magnetic phase with a propagation wave vector K 2 = (0.25 0.25 0) emerges and coexists with the one associated with K 1 , which is rarely observed and suggests complex magnetism due to phase competition in the magnetic ground state. Here, we argue that the exchange-striction arising from the up-up-down-down spin structure associated with K 2 below T N2 may be responsible for the small ferroelectric polarization reported previously in this compound.

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND↗
DOE OSTI2020

Materials Data on Ho11(In3Ge2)2 by Materials Project

Ho11(In3Ge2)2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. there are four inequivalent Ho sites. In the first Ho site, Ho is bonded in a 7-coordinate geometry to four equivalent In and three Ge atoms. There are two shorter (3.35 Å) and two longer (3.43 Å) Ho–In bond lengths. There are a spread of Ho–Ge bond distances ranging from 3.06–3.21 Å. In the second Ho site, Ho is bonded in a 5-coordinate geometry to four In and three Ge atoms. There are two shorter (3.07 Å) and two longer (3.33 Å) Ho–In bond lengths. All Ho–Ge bond lengths are 2.99 Å. In the third Ho site, Ho is bonded in a 7-coordinate geometry to three In and four Ge atoms. There are one shorter (3.27 Å) and two longer (3.44 Å) Ho–In bond lengths. There are two shorter (2.82 Å) and two longer (3.33 Å) Ho–Ge bond lengths. In the fourth Ho site, Ho is bonded in a 9-coordinate geometry to eight In and one Ge atom. There are four shorter (3.34 Å) and four longer (3.43 Å) Ho–In bond lengths. The Ho–Ge bond length is 3.52 Å. There are two inequivalent In sites. In the first In site, In is bonded in a 10-coordinate geometry to eight Ho and two In atoms. There are one shorter (2.93 Å) and one longer (3.05 Å) In–In bond lengths. In the second In site, In is bonded in a 11-coordinate geometry to seven Ho and four In atoms. Both In–In bond lengths are 2.96 Å. There are three inequivalent Ge sites. In the first Ge site, Ge is bonded in a 8-coordinate geometry to eight Ho atoms. In the second Ge site, Ge is bonded in a 9-coordinate geometry to nine Ho atoms. In the third Ge site, Ge is bonded in a 8-coordinate geometry to eight Ho atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho3(GeRh)2 by Materials Project

Ho3(RhGe)2 crystallizes in the orthorhombic Pbcm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded in a 9-coordinate geometry to four equivalent Rh and five Ge atoms. There are two shorter (3.02 Å) and two longer (3.05 Å) Ho–Rh bond lengths. There are a spread of Ho–Ge bond distances ranging from 2.99–3.30 Å. In the second Ho site, Ho is bonded in a 7-coordinate geometry to four equivalent Rh and five Ge atoms. There are a spread of Ho–Rh bond distances ranging from 2.90–3.13 Å. There are a spread of Ho–Ge bond distances ranging from 2.98–3.34 Å. Rh is bonded in a 9-coordinate geometry to six Ho and three Ge atoms. There are a spread of Rh–Ge bond distances ranging from 2.54–2.60 Å. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded in a 9-coordinate geometry to seven Ho and two equivalent Rh atoms. In the second Ge site, Ge is bonded in a 12-coordinate geometry to eight Ho and four equivalent Rh atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Ho5(GeSb)2 by Materials Project

Ho5(GeSb)2 crystallizes in the orthorhombic Cmce space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to three equivalent Ge and three equivalent Sb atoms to form distorted HoGe3Sb3 pentagonal pyramids that share corners with three equivalent HoGe4Sb2 octahedra, corners with ten equivalent HoGe3Sb3 pentagonal pyramids, edges with seven equivalent HoGe3Sb3 pentagonal pyramids, faces with two equivalent HoGe4Sb2 octahedra, and faces with two equivalent HoGe3Sb3 pentagonal pyramids. The corner-sharing octahedra tilt angles range from 36–42°. There are a spread of Ho–Ge bond distances ranging from 2.93–3.08 Å. There are a spread of Ho–Sb bond distances ranging from 3.12–3.18 Å. In the second Ho site, Ho is bonded to four equivalent Ge and two equivalent Sb atoms to form HoGe4Sb2 octahedra that share corners with four equivalent HoGe4Sb2 octahedra, corners with twelve equivalent HoGe3Sb3 pentagonal pyramids, and faces with eight equivalent HoGe3Sb3 pentagonal pyramids. The corner-sharing octahedral tilt angles are 48°. There are two shorter (3.05 Å) and two longer (3.07 Å) Ho–Ge bond lengths. Both Ho–Sb bond lengths are 3.09 Å. Ge is bonded in a 8-coordinate geometry to eight Ho atoms. Sb is bonded to seven Ho atoms to form a mixture of distorted edge and corner-sharing SbHo7 pentagonal bipyramids.

36 MATERIALS SCIENCE↗
NASA NTRS1992

Tm,Ho:YAG laser with tunable range of 2.08-2.12 microns and its applications to spectroscopy

In recent advanced lasers, 2 micron solid-state lasers such as Tm:YAG and Ho:YAG lasers are very attractive for laser radar remote sensing technologies because of eye safety, realizations of all solid-state laser pumped by diode laser and smaller dimension, tunability of lasing wavelength, possibility of coherent detection, etc. Featuring these advantages, 2 micron lasers have been candidated as laser transmitters for use in water vapor Differential Absorption Lidar (DIAL), laser altimeter, Doppler wind sensor, Mie lidar, etc. Characterization of a tunable Cr, Tm, Ho:YAG laser and its applications to spectroscopy concerning absorption and reflectance are reported.

Asai, Kazuhiro↗
DOE OSTI2020

Materials Data on Ho2(Ga3Rh)3 by Materials Project

Ho2(RhGa3)3 crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. Ho is bonded in a 11-coordinate geometry to eleven Ga atoms. There are a spread of Ho–Ga bond distances ranging from 3.02–3.14 Å. There are two inequivalent Rh sites. In the first Rh site, Rh is bonded in a 8-coordinate geometry to eight Ga atoms. There are a spread of Rh–Ga bond distances ranging from 2.58–2.65 Å. In the second Rh site, Rh is bonded in a 8-coordinate geometry to eight Ga atoms. There are a spread of Rh–Ga bond distances ranging from 2.56–2.64 Å. There are four inequivalent Ga sites. In the first Ga site, Ga is bonded in a 2-coordinate geometry to two equivalent Ho, two equivalent Rh, and six Ga atoms. There are four shorter (2.75 Å) and two longer (2.77 Å) Ga–Ga bond lengths. In the second Ga site, Ga is bonded in a 3-coordinate geometry to three equivalent Ho, three Rh, and five Ga atoms. There are a spread of Ga–Ga bond distances ranging from 2.77–2.94 Å. In the third Ga site, Ga is bonded in a 3-coordinate geometry to two equivalent Ho, three Rh, and five Ga atoms. There are one shorter (2.80 Å) and two longer (2.82 Å) Ga–Ga bond lengths. In the fourth Ga site, Ga is bonded in a 10-coordinate geometry to two equivalent Ho, two equivalent Rh, and six Ga atoms. The Ga–Ga bond length is 2.74 Å.

36 MATERIALS SCIENCE↗