Vibrational spectra of monazite-type rare-earth orthophosphates

被引：132
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.
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页码：224 / 230
页数：7
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