期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 80, 期 3, 页码 607-610出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-003-2244-z
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Raman modes of bismuth-layered perovskite Bi4-xLaxTi3O12 ceramic samples were studied as a function of La content from x = 0.00 to 0.75. In the low-wavenumber region ( 35 similar to 150 cm(-1)), the rigid mode was found to be insensitive to La substitution, while the compositional change caused a frequency upshift of one of the soft modes. In the high-wavenumber region, the results indicated that a structure transition from orthorhombic to tetragonal may occur above x = 0.75, since the B-2g and B-3g modes showed evidence of coalescence into E-g modes with increasing La content. Raman spectra of Bi3.25Nd0.75Ti3O12 and Bi3.25Sm0.75Ti3O12 are presented and compared with Bi4-xLaxTi3O12.
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