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Issue 29, 2009
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Synthesis, structure and properties of the hexagonal perovskite, h-BaTi1−xHoxO3−x/2

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Abstract

The crystal structure of hexagonal (h)-BaTi0.85Ho0.15O2.925 has been determined using neutron powder diffraction data. The structure is derived from that of h-BaTiO3 and contains Ho3+, the largest cation known to be accommodated by the B site in h-BaTiO3. Ti and Ho are disordered over the B1 octahedral sites and the structure may be regarded as intermediate between those of h-BaTiO3 and Ba3Sr(Nb,Ta)2O9. h-BaTi0.85Ho0.15O2.925 forms as a long-lived but metastable, intermediate phase before transforming, slowly, to the thermodynamically stable cubic polymorph of the same composition; its formation is an example of Ostwald's rule of successive reactions. It is an electrical insulator with relative permittivity of ∼50.

Graphical abstract: Synthesis, structure and properties of the hexagonal perovskite, h-BaTi1−xHoxO3−x/2

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Publication details

The article was received on 23 Dec 2008, accepted on 01 May 2009 and first published on 11 Jun 2009


Article type: Paper
DOI: 10.1039/B822785C
Citation: J. Mater. Chem., 2009,19, 5201-5206

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    Synthesis, structure and properties of the hexagonal perovskite, h-BaTi1−xHoxO3−x/2

    Y. Liu, E. E. McCabe, D. C. Sinclair and A. R. West, J. Mater. Chem., 2009, 19, 5201
    DOI: 10.1039/B822785C

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