Synthesis and crystal structure of CuZrTiO5—A new crystal structure type |
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Authors: | Ulrike Troitzsch Anthony C. Willis |
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Affiliation: | a Research School of Earth Sciences, Australian National University, Canberra ACT 0200, Australia b Research School of Chemistry, Australian National University, Canberra ACT 0200, Australia |
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Abstract: | A new compound, CuZrTiO5, was synthesized as strongly pleochroic green crystals from the oxides between 995 and 1010 °C, 1 atm. Its crystal structure was determined by single crystal XRD, resulting in R (F2>2σ(F2))=0.032 and wR (all data)=0.079). CuZrTiO5 is orthorhombic, space group P212121, a=3.5871(3) Å, b=6.6968(4) Å, c=14.6679(9) Å, V=352.35(4) Å3, Z=4. The structure is topologically similar to In2TiO5 but differs in space group and cation coordination. CuZrTiO5 has relatively regular TiO6 polyhedra, but coordination is 7+1 for Zr, and 4+2 for Cu due to the Jahn-Teller effect. Ordering of the long Cu-O bonds causes reduction in symmetry relative to In2TiO5. Layers of Cu alternate with Ti+Zr on (001), giving rise to a distinct cleavage. Bond valence sums on Ti and Zr are far from ideal, which appears due to the limited ability of this structural topology to avoid close next-nearest neighbour distances. |
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Keywords: | CuZrTiO5 Synthesis Crystal structure In2TiO5 Polyhedral distortion Bond valence |
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