Use the ClausiusMossotti expression to estimate the dielectric permittivities of the cubic perovskites BaZrO 3 (a =

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Use the Clausius–Mossotti expression to estimate the dielectric permittivities of the cubic perovskites BaZrO3 (a = 4.19 Å), KTaO3 (a = 3.99 Å), and SrTiO3 (a = 3.90 Å). Compare your estimates to the observed values in Table 8.1. How does the divergence between calculated and observed values correlate with the tendency for the octahedral cations to undergo SOJT distortions? What does this tell you about compositions for which the Clausius–Mossotti equation can reliably be used?

Table 8.1

Substance Air Teflon C (diamond) Si NaF MgO SiO CaF2 Pbl HO Er 1.0006 2 6 12 5 10 4 7 21 80 Substance SnO ZrO

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Solid State Materials Chemistry

ISBN: 9780521873253

1st Edition

Authors: Patrick M. Woodward, Pavel Karen, John S. O. Evans, Thomas Vogt

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