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Raman spectra of Pb1–3x Bi2x MoO4 (x ⩽ 0.06) and their 18O-substituted systems

✍ Scribed by Isao Kanesaka; Masaru Kirishiki; Ikuya Matsuura

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
363 KB
Volume
23
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

A new band at 896 cm^−1^ is ascribed to a local mode, v~1~, due to a molybdate ion occupying a cation vacancy. Local modes for v~3~ and v~4~ were also found at ca. 800 and 397 cm^−1^, respectively. The relative intensity for translational modes at 71 and 59 cm^−1^ varied considerably with x. This was explained in terms of a decrease in primitive cells with two Pb^2+^ ions. The band decomposition was carried out for the v~1~ region in ^18^O‐substituted systems. The equilibrium distribution for isotopic species, [Mo^16^O~4‐n~^18^O~n~]^2−^ (n=0‐4). was found approximately in the system with x = 0.01 after annealing, whereas the discrepancy between the observed and equilibrium distributions increased with increase in x. These observations show that a molybdate ion interacting strongly with a Bi^3+^ ion and a cation vacancy is inactive for ^18^O‐substitution.

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