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At least 217 records · Page 12
All sourcesNASA NTRSDOE OSTI
NASA NTRS1998

Luminescence of Eu(3+) doped SiO2 Thin Films and Glass Prepared by Sol-gel Technology

Trivalent europium ions are an important luminophore for lighting and display. The emission of (5)D0 to (7)F2 transition exhibits a red color at about 610 nm, which is very attractive and fulfills the requirement for most red-emitting phosphors including lamp and cathode ray phosphorescence materials. Various EU(3+) doped phosphors have been developed, and luminescence properties have been extensively studied. On the other hand, sol-gel technology has been well developed by chemists. In recent years, applications of this technology to optical materials have drawn a great attention. Sol-gel technology provides a unique way to obtain homogeneous composition distribution and uniform doping, and the processing temperature can be very low. In this work, EU(3+) doped SiO2 thin films and glasses were prepared by sol-gel technology and their spectroscopic properties were investigated.

Castro, Lymari↗
NASA NTRS2005

Electrical and Optical Property of Ferroelectric BaTiO3:Eu

We studied various electrical and optical properties of Europium (1 atomic %) incorporated BaTiO3 film on n-Si(100) substrate. The thin film structure was analyzed by X-ray diffraction. Film thickness and optical refractive index were measured with an ellipsometer. P-E hysteresis measurement shows the remnant polarization of 37 micro C/sq cm in BaTiO3:Eu film. C-V measurements on the pure BaTiO3 film show recovery of capacitance across sweeping voltage ranges with a narrow transition zone due to the polarization change. On the other hand, C-V and I-V measurements on the BaTiO3:Eu film show that Europium incorporation increases positively charged states in the BaTiO3 layer such that BaTiO3:Eu/n-Si interface behaves like a leaky p-n junction.

Park, Yeonjoon↗
DOE OSTI2020

Materials Data on Eu(CdSb)2 by Materials Project

EuCd2Sb2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Eu2+ is bonded to six equivalent Sb3- atoms to form EuSb6 octahedra that share corners with twelve equivalent CdSb4 tetrahedra, edges with six equivalent EuSb6 octahedra, and edges with six equivalent CdSb4 tetrahedra. All Eu–Sb bond lengths are 3.33 Å. Cd2+ is bonded to four equivalent Sb3- atoms to form CdSb4 tetrahedra that share corners with six equivalent EuSb6 octahedra, corners with six equivalent CdSb4 tetrahedra, edges with three equivalent EuSb6 octahedra, and edges with three equivalent CdSb4 tetrahedra. The corner-sharing octahedra tilt angles range from 15–56°. There are three shorter (2.91 Å) and one longer (3.00 Å) Cd–Sb bond lengths. Sb3- is bonded to three equivalent Eu2+ and four equivalent Cd2+ atoms to form a mixture of distorted edge and corner-sharing SbEu3Cd4 pentagonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(CoP)2 by Materials Project

EuCo2P2 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu2+ is bonded in a body-centered cubic geometry to eight equivalent P3- atoms. All Eu–P bond lengths are 3.11 Å. Co2+ is bonded to four equivalent P3- atoms to form a mixture of corner and edge-sharing CoP4 tetrahedra. All Co–P bond lengths are 2.21 Å. P3- is bonded in a 8-coordinate geometry to four equivalent Eu2+ and four equivalent Co2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(FeP)2 by Materials Project

EuFe2P2 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu2+ is bonded in a body-centered cubic geometry to eight equivalent P3- atoms. All Eu–P bond lengths are 3.13 Å. Fe2+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing FeP4 tetrahedra. All Fe–P bond lengths are 2.20 Å. P3- is bonded in a 4-coordinate geometry to four equivalent Eu2+ and four equivalent Fe2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(SiPd)2 by Materials Project

EuPd2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu2+ is bonded to eight equivalent Si4- atoms to form EuSi8 hexagonal bipyramids that share corners with sixteen equivalent PdSi4 tetrahedra, edges with four equivalent EuSi8 hexagonal bipyramids, edges with eight equivalent PdSi4 tetrahedra, and faces with four equivalent EuSi8 hexagonal bipyramids. All Eu–Si bond lengths are 3.25 Å. Pd3+ is bonded to four equivalent Si4- atoms to form PdSi4 tetrahedra that share corners with eight equivalent EuSi8 hexagonal bipyramids, corners with four equivalent PdSi4 tetrahedra, edges with four equivalent EuSi8 hexagonal bipyramids, and edges with four equivalent PdSi4 tetrahedra. All Pd–Si bond lengths are 2.48 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Eu2+, four equivalent Pd3+, and one Si4- atom. The Si–Si bond length is 2.42 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(MnAs)2 by Materials Project

EuMn2As2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Eu2+ is bonded to six equivalent As3- atoms to form EuAs6 octahedra that share corners with twelve equivalent MnAs4 tetrahedra, edges with six equivalent EuAs6 octahedra, and edges with six equivalent MnAs4 tetrahedra. All Eu–As bond lengths are 3.04 Å. Mn2+ is bonded to four equivalent As3- atoms to form MnAs4 tetrahedra that share corners with six equivalent EuAs6 octahedra, corners with six equivalent MnAs4 tetrahedra, edges with three equivalent EuAs6 octahedra, and edges with three equivalent MnAs4 tetrahedra. The corner-sharing octahedra tilt angles range from 21–50°. There are one shorter (2.42 Å) and three longer (2.45 Å) Mn–As bond lengths. As3- is bonded in a 7-coordinate geometry to three equivalent Eu2+ and four equivalent Mn2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(AlSi)2 by Materials Project

EuAl2Si2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Eu2+ is bonded to six equivalent Si4- atoms to form EuSi6 octahedra that share corners with twelve equivalent AlSi4 tetrahedra, edges with six equivalent EuSi6 octahedra, and edges with six equivalent AlSi4 tetrahedra. All Eu–Si bond lengths are 3.07 Å. Al3+ is bonded to four equivalent Si4- atoms to form AlSi4 tetrahedra that share corners with six equivalent EuSi6 octahedra, corners with six equivalent AlSi4 tetrahedra, edges with three equivalent EuSi6 octahedra, and edges with three equivalent AlSi4 tetrahedra. The corner-sharing octahedra tilt angles range from 21–52°. There are three shorter (2.53 Å) and one longer (2.59 Å) Al–Si bond lengths. Si4- is bonded to three equivalent Eu2+ and four equivalent Al3+ atoms to form a mixture of distorted edge and corner-sharing SiEu3Al4 pentagonal bipyramids.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(Sb3Ru)4 by Materials Project

EuRu4Sb12 crystallizes in the cubic Im-3 space group. The structure is three-dimensional. Eu2+ is bonded to twelve equivalent Sb1- atoms to form EuSb12 cuboctahedra that share faces with eight equivalent RuSb6 octahedra. All Eu–Sb bond lengths are 3.54 Å. Ru+2.50+ is bonded to six equivalent Sb1- atoms to form RuSb6 octahedra that share corners with six equivalent RuSb6 octahedra and faces with two equivalent EuSb12 cuboctahedra. The corner-sharing octahedral tilt angles are 55°. All Ru–Sb bond lengths are 2.65 Å. Sb1- is bonded in a 2-coordinate geometry to one Eu2+, two equivalent Ru+2.50+, and two equivalent Sb1- atoms. Both Sb–Sb bond lengths are 2.99 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(FeP3)4 by Materials Project

EuFe4P12 crystallizes in the cubic Im-3 space group. The structure is three-dimensional. Eu2+ is bonded to twelve equivalent P1- atoms to form EuP12 cuboctahedra that share faces with eight equivalent FeP6 octahedra. All Eu–P bond lengths are 3.00 Å. Fe+2.50+ is bonded to six equivalent P1- atoms to form FeP6 octahedra that share corners with six equivalent FeP6 octahedra and faces with two equivalent EuP12 cuboctahedra. The corner-sharing octahedral tilt angles are 60°. All Fe–P bond lengths are 2.25 Å. P1- is bonded in a distorted bent 120 degrees geometry to one Eu2+, two equivalent Fe+2.50+, and two equivalent P1- atoms. There are one shorter (2.29 Å) and one longer (2.35 Å) P–P bond lengths.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(FeAs)2 by Materials Project

EuFe2As2 is alpha bismuth trifluoride-derived structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu2+ is bonded in a body-centered cubic geometry to eight equivalent As3- atoms. All Eu–As bond lengths are 3.19 Å. Fe2+ is bonded to four equivalent As3- atoms to form a mixture of corner and edge-sharing FeAs4 tetrahedra. All Fe–As bond lengths are 2.31 Å. As3- is bonded in a 4-coordinate geometry to four equivalent Eu2+ and four equivalent Fe2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(SiRh)2 by Materials Project

EuRh2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu2+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Eu–Si bond lengths are 3.20 Å. Rh3+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing RhSi4 tetrahedra. All Rh–Si bond lengths are 2.41 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Eu2+, four equivalent Rh3+, and one Si4- atom. The Si–Si bond length is 2.62 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(MnP)2 by Materials Project

EuMn2P2 crystallizes in the trigonal P-3m1 space group. The structure is three-dimensional. Eu2+ is bonded to six equivalent P3- atoms to form EuP6 octahedra that share corners with twelve equivalent MnP4 tetrahedra, edges with six equivalent EuP6 octahedra, and edges with six equivalent MnP4 tetrahedra. All Eu–P bond lengths are 2.95 Å. Mn2+ is bonded to four equivalent P3- atoms to form MnP4 tetrahedra that share corners with six equivalent EuP6 octahedra, corners with six equivalent MnP4 tetrahedra, edges with three equivalent EuP6 octahedra, and edges with three equivalent MnP4 tetrahedra. The corner-sharing octahedra tilt angles range from 27–48°. There are one shorter (2.21 Å) and three longer (2.26 Å) Mn–P bond lengths. P3- is bonded in a 7-coordinate geometry to three equivalent Eu2+ and four equivalent Mn2+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(SiIr)2 by Materials Project

EuIr2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu2+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Eu–Si bond lengths are 3.19 Å. Ir3+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing IrSi4 tetrahedra. All Ir–Si bond lengths are 2.42 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Eu2+, four equivalent Ir3+, and one Si4- atom. The Si–Si bond length is 2.59 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(SiAg)2 by Materials Project

EuAg2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu3+ is bonded to eight equivalent Si4- atoms to form EuSi8 hexagonal bipyramids that share corners with sixteen equivalent AgSi4 tetrahedra, edges with four equivalent EuSi8 hexagonal bipyramids, edges with eight equivalent AgSi4 tetrahedra, and faces with four equivalent EuSi8 hexagonal bipyramids. All Eu–Si bond lengths are 3.27 Å. Ag+2.50+ is bonded to four equivalent Si4- atoms to form AgSi4 tetrahedra that share corners with eight equivalent EuSi8 hexagonal bipyramids, corners with four equivalent AgSi4 tetrahedra, edges with four equivalent EuSi8 hexagonal bipyramids, and edges with four equivalent AgSi4 tetrahedra. All Ag–Si bond lengths are 2.63 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Eu3+, four equivalent Ag+2.50+, and one Si4- atom. The Si–Si bond length is 2.32 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(CuSi)2 by Materials Project

EuCu2Si2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu3+ is bonded in a distorted body-centered cubic geometry to eight equivalent Si4- atoms. All Eu–Si bond lengths are 3.13 Å. Cu+2.50+ is bonded to four equivalent Si4- atoms to form a mixture of edge and corner-sharing CuSi4 tetrahedra. All Cu–Si bond lengths are 2.41 Å. Si4- is bonded in a 9-coordinate geometry to four equivalent Eu3+, four equivalent Cu+2.50+, and one Si4- atom. The Si–Si bond length is 2.41 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(Mo3S4)2 by Materials Project

EuMo6S8 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Eu2+ is bonded in a body-centered cubic geometry to eight S2- atoms. There are two shorter (2.81 Å) and six longer (3.11 Å) Eu–S bond lengths. Mo+2.33+ is bonded to five S2- atoms to form a mixture of edge and corner-sharing MoS5 square pyramids. There are a spread of Mo–S bond distances ranging from 2.41–2.59 Å. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a 4-coordinate geometry to one Eu2+ and three equivalent Mo+2.33+ atoms. In the second S2- site, S2- is bonded in a 5-coordinate geometry to one Eu2+ and four equivalent Mo+2.33+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Eu(NiP)2 by Materials Project

EuNi2P2 crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Eu2+ is bonded in a distorted body-centered cubic geometry to eight equivalent P3- atoms. All Eu–P bond lengths are 3.04 Å. Ni2+ is bonded to four equivalent P3- atoms to form a mixture of edge and corner-sharing NiP4 tetrahedra. All Ni–P bond lengths are 2.30 Å. P3- is bonded in a 9-coordinate geometry to four equivalent Eu2+, four equivalent Ni2+, and one P3- atom. The P–P bond length is 2.41 Å.

36 MATERIALS SCIENCE↗