Abstract
A complex perovskite oxide HoBa 2SbO 6 in the Ho–Ba–Hf–O, rare-earth based oxide system, has been synthesised and sintered as a single phase material. The structure, microstructure, quantitative elemental analysis and magnetic properties of this material have been studied by X-ray diffraction, scanning electron microscopy (SEM), energy dispersive X-ray (EDX) techniques and magnetic susceptibility measurements. Significant presence of superstructure reflection lines in the XRD spectra of HoBa 2SbO 6 reveals that it is an ordered complex perovskite oxide. Magnetic susceptibility measurements show that HoBa 2SbO 6 presents a paramagnetic behaviour at low temperature (5–300 K). Microstructure and EDX analysis show that sintered HoBa 2SbO 6 has homogeneous surface morphology with uniform particle size (1–2 μm) distribution and there is no evidence of impurity in the single phase sintered HoBa 2SbO 6. The chemical stability of HoBa 2SbO 6 with YBa 2Cu 3O 7− δ superconductor was studied. This study shows that HoBa 2SbO 6 is chemically compatible with YBa 2Cu 3O 7− δ and it did not have deleterious effect on the superconducting transition temperature of YBa 2Cu 3O 7− δ . Also, HoBa 2SbO 6 melts congruently and single crystals could be grown from the melt. In view of these favourable characteristics, HoBa 2SbO 6 could be used as a potential substrate material for YBa 2Cu 3O 7− δ superconductor film.
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