In a simple cubic perovskite like SrTiO 3 , all oxygens are equivalent Each makes two bonds to Ti 4 and four to Sr 2 , as shown in a bond graph below (a) Draw a comparable bond graph for a 1 1 ordered perovskite Ba 2 ScTaO 6 that obeys Paulingsrule of parsimony (b) Use the bond graph to estimate th...

In a simple cubic perovskite like SrTiO 3 , all oxygens are equivalent. Each makes two bonds

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In a simple cubic perovskite like SrTiO₃, all oxygens are equivalent. Each makes two bonds to Ti⁴⁺ and four to Sr²⁺, as shown in a bond graph below.

Ti 0 Sr 0

(a) Draw a comparable bond graph for a 1:1 ordered perovskite Ba₂ScTaO₆ that obeys Pauling’srule of parsimony.

(b) Use the bond graph to estimate the Ba–O, Sc–O, and Ta–O bond valences.

(c) Draw a comparable bond graph for the 1:2 ordered perovskite Ba₃ZnTa₂O₉ and determine the minimum number of chemical environments needed for oxygen is this structure. For each such type of oxygen, determine the number of bonds it makes to each cation.

(d) What are the bond valences for Ba–O, Zn–O, and Ta–O? What are the bond-valence sums for each type of oxygen?

(e) Based on your answers to parts (b) and (d), do the oxygen bond valences suggest a bonding instability that might trigger an SOJT distortion of the Ta⁵⁺ ions? Explain your reasoning.

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a Parsimony rule suggests that all oxygens are equivalent This is possible with each O ...View the full answer

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Related Book For answer-question

Solid State Materials Chemistry

ISBN: 9780521873253

1st Edition

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

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Question Posted: Jan 23, 2024 10:04 AM

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