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Infrared and Raman spectra of solid solutions Ti1−xZrxO2 (x⩽0.1)

1994; Elsevier BV; Volume: 55; Issue: 4 Linguagem: Inglês

10.1016/0022-3697(94)90231-3

1879-2553

T. Hirata, Masahiro Kitajima, Kazutaka G. Nakamura, E. Asari,

Advanced ceramic materials synthesis

Infrared and Raman spectra of solid solutions Ti1−xZrxO2 (x⩽0.1) have been measured as a function of the concentration x at room temperature. The Eg mode at 448cm1̄ for rutile (TiO2) noticeably softened and broadened with increasing x, while the Alg mode at 613 cm1̄ remained unchanged in frequency but broadened slightly. The disorder induced Raman band(broad) at 235 cm1̄ showed a decrease in frequency with x. Moreover, the infrared-active Eu, modes at 398 cm1̄ and 516 cm1̄ softened with x in the solid solutions. X-ray diffraction confirmed that the lattice parameters, a and c, almost linearly increase with x in Ti1−xZrxO2, altering the positional parameter of the oxygen anions in TiO6. It turned out that the concentration dependence of optical modes for Ti1−xZrxO2 is associated with the force constant change of the six cation-anion bonds based on the octahedral distortions of TiO6, as Ti4+ is replaced by Zr4+ with a larger ion radius than Ti4+.