Vibrational spectra of monazite-type rare-earth orthophosphates

被引：134

作者：

Silva, E. N.

Ayala, A. P.

Guedes, I.

Paschoal, C. W. A.

Moreira, R. L.

Loong, C. -K.

Boatner, L. A.

机构：

[1] Univ Fed Ceara, Dept Fis, BR-60455970 Fortaleza, Ceara, Brazil

[2] Univ Fed maranhao, CCET, Dept Fis, BR-65085580 Maranhao, Brazil

[3] Univ Fed Minas Gerais, ICEx, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil

[4] Argonne Natl Lab, Div Intense Pulsed Neutron Source, Argonne, IL 60439 USA

[5] Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA

来源：

OPTICAL MATERIALS | 2006年 / 29卷 / 2-3期

关键词：

RPO4; Raman scattering; infrared spectroscopy; monazite;

D O I：

10.1016/j.optmat.2005.09.001

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The room-temperature vibrational spectra of the monazite-type rare-earth orthophosphates (RPO4, R = La, Ce, Pr, Nd, Sm, Eu. and Gd) have been investigated using polarized Raman and infrared spectroscopies. As in the case of the previously reported Raman results, we also observe 22 peaks, while only 18 A(g)/B-g vibrations are predicted by group theoretical analysis. Through a careful review of the combined Raman-IR modes, in conjunction with the measured generalized phonon density of states of LaPO4 by neutron spectroscopy and a comparison with the corresponding data for the xenotime RPO4 members, we have obtained a self-consistent assignment of the Raman and IR modes. We also discuss on the possible origins of the previously unidentified "extra" peaks. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：224 / 230

页数：7

共 17 条

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