Crystal structure under pressure of geometrically frustrated pyrochlores

被引：17

作者：

Apetrei, A.

Mirebeau, I. ^{[1
]}

Goncharenko, I.

Crichton, W. A.

机构：

[1] CE Saclay, CEA, CNRS, Lab Leon Brillouin, F-91191 Gif Sur Yvette, France

[2] European Synchrotron Radiat Facil, F-38043 Grenoble, France

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2007年 / 19卷 / 37期

关键词：

D O I：

10.1088/0953-8984/19/37/376208

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We have studied by x-ray synchrotron diffraction under high pressure five pyrochlore compounds: Tb2Ti2O7 (up to 42 GPa), Tb2Sn2O7 and Tb2Mo2O7 (up to 35 GPa), Gd2Mo2O7 and (Tb0.8La0.2)(2)Mo2O7 (up to 10GPa). At ambient pressure all compounds crystallize in the cubic F d(3) over bar m symmetry group. This structure is stable for all compounds in the investigated pressure range. All three compounds having Mo as transition metal are described by the same equation of state, with the same bulk modulus B-0 = 149. The bulk modulus is smaller in the Mo pyrochlores than in the Ti and Sn ones, in contrast with a priori expectations.

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页数：10

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