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DOE OSTI2020

Materials Data on Y2SiO5 by Materials Project

Y2SiO5 crystallizes in the monoclinic C2/c space group. The structure is three-dimensional. there are two inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in a 7-coordinate geometry to seven O2- atoms. There are a spread of Y–O bond distances ranging from 2.22–2.70 Å. In the second Y3+ site, Y3+ is bonded to six O2- atoms to form distorted YO6 octahedra that share corners with four equivalent SiO4 tetrahedra and edges with two equivalent YO6 octahedra. There are a spread of Y–O bond distances ranging from 2.23–2.32 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with four equivalent YO6 octahedra. The corner-sharing octahedra tilt angles range from 43–66°. There are a spread of Si–O bond distances ranging from 1.63–1.66 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded in a 3-coordinate geometry to two Y3+ and one Si4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to three Y3+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Y3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded to four Y3+ atoms to form edge-sharing OY4 tetrahedra. In the fifth O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent Y3+ and one Si4+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2020

Materials Data on Y2SiO5 by Materials Project

Y2SiO5 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Y3+ sites. In the first Y3+ site, Y3+ is bonded in a 8-coordinate geometry to eight O2- atoms. There are a spread of Y–O bond distances ranging from 2.27–2.65 Å. In the second Y3+ site, Y3+ is bonded to seven O2- atoms to form distorted YO7 hexagonal pyramids that share corners with two equivalent SiO4 tetrahedra, edges with six equivalent YO7 hexagonal pyramids, and an edgeedge with one SiO4 tetrahedra. There are a spread of Y–O bond distances ranging from 2.25–2.57 Å. Si4+ is bonded to four O2- atoms to form SiO4 tetrahedra that share corners with two equivalent YO7 hexagonal pyramids and an edgeedge with one YO7 hexagonal pyramid. There are a spread of Si–O bond distances ranging from 1.61–1.67 Å. There are five inequivalent O2- sites. In the first O2- site, O2- is bonded to four Y3+ atoms to form a mixture of edge and corner-sharing OY4 tetrahedra. In the second O2- site, O2- is bonded in a 4-coordinate geometry to three equivalent Y3+ and one Si4+ atom. In the third O2- site, O2- is bonded in a 4-coordinate geometry to three Y3+ and one Si4+ atom. In the fourth O2- site, O2- is bonded in a 1-coordinate geometry to two equivalent Y3+ and one Si4+ atom. In the fifth O2- site, O2- is bonded in a 1-coordinate geometry to three equivalent Y3+ and one Si4+ atom.

36 MATERIALS SCIENCE↗

DOE OSTI2024

Proton Quenching in Rare-Earth Inorganic Scintillators: GAGG:Ce and YSO:Ce

Scintillator detectors are an integral component of radiation detection systems for a variety of applications such as medical imaging, accelerator diagnostics, and space science. Typically, a scintillator detector’s response is characterized using gamma sources to understand the detection response to different types of radiation, including charged particle detection. However, there exists a nonlinearity of the amount of light produced from an incident gamma ray of specific energy and the light produced from an incident charged particle of the same energy. This important effect, known as quenching, must be accounted for to interpret energies from charged particles incident on detectors. In this article, we present results of quenching parameterization for two types of cerium-doped inorganic scintillators, Y2SiO5:Ce (YSO:Ce) and Gd3Al2Ga3O12:Ce (GAGG:Ce). We measured the light output from incident proton energies from 1 to 25 MeV using a 3-MV tandem accelerator and two reactions: Au(p,p)Au and 3He(d,p)⁴He. Using gamma-ray sources to calibrate the detectors, we compared the measured electron-equivalent energy versus the incident energy expected. Using an adaptation of the Birks semi-empirical formula, we extracted the Birks parameter (kB) to understand quenching. For one of the GAGG:Ce samples, the kB parameter of 0.0072 [g cm-2 MeV-1] is comparable to a similar study where the value of kB was 0.0065 [g cm-2 MeV-1]. For YSO:Ce, no other kB values were found in the literature. Three different types of GAGG:Ce were used to collect measurements of kB as a function of dopant concentration.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗