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|Title:||Raman spectrum of ferroelectric PbDPO4: Comparison with PbHPO4|
|Source:||Ohno, N.,Lockwood, D.J.,Kuok, M.H. (1986). Raman spectrum of ferroelectric PbDPO4: Comparison with PbHPO4. The Journal of Chemical Physics 84 (12) : 6599-6608. ScholarBank@NUS Repository.|
|Abstract:||The Raman spectrum of ferroelectric PbDPO4 (T c≃450 K) has been measured at temperatures between 10 and 484 K in the frequency region 8-3000 cm-1. Mode assignments have been made by comparison with similar Raman measurements on PbHPO4 (T c≃310 K). It is found that the lattice modes and PO4 internal modes are scarcely affected by the isotope change, although the high-frequency hydrogen modes do show the expected shift to lower frequency in the deuterium compound. The overall similarities in the spectra of the two compounds both above and below Tc indicate that PbDPO4 has an acentric crystal structure above Tc, as was recently discovered for PbHPO4. The Raman data indicate the phase transitions in PbDPO4 and PbHPO4 are of the order-disorder type. © 1986 American Institute of Physics.|
|Source Title:||The Journal of Chemical Physics|
|Appears in Collections:||Staff Publications|
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