Two pressure-induced structural phase transitions in TiOCl

被引：4

作者：

Ebad-Allah, J. ^{[1
]}

Schoenleber, A. ^{[2
]}

van Smaalen, S. ^{[2
]}

Hanfland, M. ^{[3
]}

Klemm, M. ^{[1
]}

Horn, S. ^{[1
]}

Glawion, S. ^{[4
]}

Sing, M. ^{[4
]}

Claessen, R. ^{[4
]}

Kuntscher, C. A. ^{[1
]}

机构：

[1] Univ Augsburg, D-86135 Augsburg, Germany

[2] Univ Bayreuth, Lab Crystallog, D-95440 Bayreuth, Germany

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

[4] Univ Wurzburg, D-97074 Wurzburg, Germany

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 13期

关键词：

EXTERNAL-PRESSURE; TIOBR;

D O I：

10.1103/PhysRevB.82.134117

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We studied the crystal structure of TiOCl up to pressures of p = 25 GPa at room temperature by x-ray powder-diffraction measurements. Two pressure-induced structural phase transitions are observed: at p(c1) approximate to 15 GPa emerges an 2a x 2b x c superstructure with b-axis unique monoclinic symmetry (space group P2(1)/m). At p(c2) approximate to 22 GPa, all lattice parameters of the monoclinic phase show a pronounced anomaly. A fraction of the sample persists in the ambient orthorhombic phase (space group Pmmn) over the whole pressure range.

引用

页数：5

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