Raman study of phonon modes in bismuth pyrochlores

被引：91

作者：

Arenas, D. J. ^{[1
,2
]}

Gasparov, L. V. ^{[1
]}

Qiu, Wei ^{[3
]}

Nino, J. C. ^{[3
]}

Patterson, Charles H. ^{[4
]}

Tanner, D. B. ^{[2
]}

机构：

[1] Univ N Florida, Dept Phys, Jacksonville, FL 32224 USA

[2] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[3] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

[4] Trinity Coll Dublin, Sch Phys, Dublin 2, Ireland

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 21期

基金：

爱尔兰科学基金会; 美国国家科学基金会;

关键词：

X-RAY-DIFFRACTION; DIELECTRIC-RELAXATION; VIBRATIONAL-SPECTRA; SOLID-SOLUTIONS; FORCE-FIELD; TEMPERATURE; SCATTERING; SPECTROSCOPY; OXIDES;

D O I：

10.1103/PhysRevB.82.214302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The Raman spectra of the cubic bismuth pyrochlores Bi3/2Zn0.92Nb3/2O6.92, Bi3/2ZnTa3/2O7, Bi3/2MgNb3/2O7, and Bi3/2MgTa3/2O7 have been measured at room temperature. The frequencies of the Raman modes, obtained from first-principles calculations, for Bi2Ti2O7 are presented for comparison. The spectra of the four samples are similar and agree well with the first-principles calculations. Each bismuth pyrochlore shows more than the six modes expected for the ideal pyrochlore structure. The analysis shows that many of the additional modes could be explained as the relaxation of the selection rules due to the displacive disorder. The Raman modes are assigned by reference to spectra of other pyrochlore materials, comparison to infrared data, and the ab initio calculations.

引用

页数：8

共 45 条

[1]

[Anonymous], CRYSTAL06 USERS MANU

[2]

[Anonymous], 1999, MOL SPECTROSCOPY

[3] Static disorder from lone-pair electrons in Bi2-xMxRu2O7-y (M=Cu, Co; x=0, 0.4) pyrochlores [J].

Avdeev, M ;

Haas, MK ;

Jorgenson, JD ;

Cava, RJ .

JOURNAL OF SOLID STATE CHEMISTRY, 2002, 169 (01) :24-34

[4] Lattice dynamical study of optical modes in Tl2Mn2O7 and In2Mn2O7 pyrochlores -: art. no. 054434 [J].

Brown, S ;

Gupta, HC ;

Alonso, JA ;

Martínez-Lope, MJ .

PHYSICAL REVIEW B, 2004, 69 (05)

[5] Vibrational spectra and force field calculation of A2Mn2O7 (A = Y, Dy, Er, Yb) pyrochlores [J].

Brown, S ;

Gupta, HC ;

Alonso, JA ;

Martinez-Lope, MJ .

JOURNAL OF RAMAN SPECTROSCOPY, 2003, 34 (03) :240-243

[6] Infrared study of the phonon modes in bismuth pyrochlores [J].

Chen, MH ;

Tanner, DB ;

Nino, JC .

PHYSICAL REVIEW B, 2005, 72 (05)

[7] Double subtractive spectrometer as a tunable high-resolution broad-bandpass optical filter [J].

Dunstan, DJ ;

Frogley, MD .

REVIEW OF SCIENTIFIC INSTRUMENTS, 2002, 73 (11) :3742-3746

[8]

FENNIE CJ, ARXIV07121846

[9] Structure and stability of Cd2Nb2O7 and Cd2Ta2O7 explored by ab initio calculations [J].

Fischer, Michael ;

Malcherek, Thomas ;

Bismayer, Ulrich ;

Blaha, Peter ;

Schwarz, Karlheinz .

PHYSICAL REVIEW B, 2008, 78 (01)

[10] RAMAN-ACTIVE RESONANCE MODES, OVERTONES, AND ANHARMONICITY IN NACL-CU [J].

GANGULY, BN ;

KLEIN, MV ;

KIRBY, RD ;

MONTGOME.GP .

PHYSICAL REVIEW LETTERS, 1972, 28 (05) :307-&

← 1 2 3 4 5 →