Crystal structures and thermal expansion of Yb2Si2O7-Gd2Si2O7 solid solutions

被引：11

作者：

Stokes, Jamesa L. ^{[1
]}

Harder, Bryan J. ^{[1
]}

Wiesner, Valerie L. ^{[2
]}

Wolfe, Douglas E. ^{[3
,4
,5
,6
,7
]}

机构：

[1] NASA Glenn Res Ctr, Cleveland, OH 44135 USA

[2] NASA Langley Res Ctr, Hampton, VA 23666 USA

[3] Penn State Univ, Appl Res Lab, University Pk, PA 16802 USA

[4] Penn State Univ, Mat Sci & Engn Dept, University Pk, PA 16802 USA

[5] Penn State Univ, Ken & Mary Alice Lindquist Nucl Engn Dept, University Pk, PA 16802 USA

[6] Penn State Univ, Engn Sci & Mech Dept, University Pk, PA 16802 USA

[7] Penn State Univ, Addit Mfg & Design Dept, University Pk, PA 16802 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2022年 / 312卷

基金：

美国国家航空航天局;

关键词：

Rare earth; Silicates; Phase stability; Thermal expansion; Yb2Si2O7; Gd2Si2O7; RARE-EARTH DISILICATES; POWDER DIFFRACTION; POLYMORPHISM; PHOTOLUMINESCENCE; OPTIMIZATION; STABILITY; ALPHA; BETA; GD;

D O I：

10.1016/j.jssc.2022.123166

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Solid solutions within the Yb2Si2O7-Gd2Si2O7 system were synthesized by a solid state reaction route and characterized for their structural and thermal properties. Incorporation of Gd2Si2O7 into Yb2Si2O7 resulted in multiple phase transformations, with the solid solutions exhibiting the monoclinic beta-RE2Si2O7, monoclinic gamma-RE2Si2O7, and orthorhombic delta-RE2Si2O7 crystal structures. The stability of crystal structures with additions of Gd2Si2O7 are attributed to space filling and minimization of molar volume. The thermal expansion coefficients (CTE) of the beta and gamma structures were largely unchanged by the addition of Gd2Si2O7 to the lattice, although the orthorhombic Yb2Si2O7-Gd2Si2O7 solid solution exhibited slightly less anisotropy in CTE of the lattice directions (25 degrees C-1500 degrees C) than undoped orthorhombic delta-Gd2Si2O7.

引用

页数：9

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[2]

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[3]

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[4]

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