Pressure-induced isostructural phase transformation in γ-B28

被引：25

作者：

Zarechnaya, Evgeniya ^{[2
]}

Dubrovinskaia, Natalia ^{[1
,3
]}

Caracas, Razvan ^{[4
]}

Merlini, Marco ^{[5
]}

Hanfland, Michael ^{[6
]}

Filinchuk, Yaroslav ^{[6
]}

Chernyshov, Dmitry ^{[6
]}

Dmitriev, Vladimir ^{[6
]}

Dubrovinsky, Leonid ^{[2
]}

机构：

[1] Heidelberg Univ, Inst Geowissensch, D-69120 Heidelberg, Germany

[2] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany

[3] Univ Bayreuth, Inst Phys, Lehrstuhl Kristallographie, D-95440 Bayreuth, Germany

[4] Ecole Normale Super Lyon, Lab Sci Terre, CNRS, F-69364 Lyon 07, France

[5] Univ Milan, Dipartimento Sci Terra, I-20133 Milan, Italy

[6] ESRF, F-38043 Grenoble, France

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 18期

关键词：

X-RAY-DIFFRACTION; ORTHORHOMBIC BORON; LATTICE-DYNAMICS; TRANSITION; CRYSTALS; ELEMENTS; COLLAPSE;

D O I：

10.1103/PhysRevB.82.184111

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Isostructural phase transformations (ISPhTs) so far were reported only for heavy elements and their compounds with complex electronic and/or magnetic structures. Studies of one of the lightest elemental material, high-pressure boron gamma-B-28, by means of in situ single-crystal x-ray diffraction and Raman spectroscopy reveal abrupt changes in the compressional behavior and Raman spectra at 40 GPa. Combined experimental and ab initio theoretical analysis of the structural and vibrational properties of gamma-B-28 suggests that the ISPhT under compression is due to the changes in the polarity of the covalent bonds between the boron atoms in the complex quasimolecular structure of gamma-B-28.

引用

页数：11

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