Structures, phase transitions and microwave dielectric properties of the 6H perovskites Ba3BSb2O9, B=Mg, Ca, Sr, Ba

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dc.contributor.authorLing, CDen_AU
dc.contributor.authorRowda, Ben_AU
dc.contributor.authorAvdeev, Men_AU
dc.contributor.authorPullar, Ren_AU
dc.date.accessioned2009-06-16T03:32:54Zen_AU
dc.date.accessioned2010-04-30T05:03:54Zen_AU
dc.date.available2009-06-16T03:32:54Zen_AU
dc.date.available2010-04-30T05:03:54Zen_AU
dc.date.issued2009-03en_AU
dc.date.statistics2009-03en_AU
dc.description.abstractWe present a complete temperature-composition phase diagram for Ba3BSb2O9, B = Mg, Ca, Sr, Ba, along with their electrical behavior as a function of B. These compounds have long been recognized as 6H-type perovskites, but (with the exception of B = Mg) their exact Structures and properties were unknown clue to their low symmetries, temperature-dependent phase transitions, and difficulties in synthesizing pure samples. The full range of possible space group symmetries is observed, from ideal hexagonal P6(3)/mmc to monoclinic C2/c to triclinic P1. Direct second-order transitions between these phases are plausible according to group theory, and no evidence was seen for my further intermediate phases. The phase diagram with respect to temperature and the effective ionic radius Of B is remarkably symmetrical for B = Mg, Ca, and Sr. For B = Ba, a first-order phase transition to a locally distorted phase allows a metastable hexagonal phase to persist to lower temperatures than expected before decomposing around 600 K. Electrical measurements revealed that dielectric permittivity corrected for porosity does not change significantly as a function of B and is in a good agreement with the values predicted by the Clausius-Mossotti equation. © 2008, Elsevier Ltd.en_AU
dc.identifier.citationLing, C. D., Rowda, B., Avdeev, M., & Pullar, R. (2009). Structures, phase transitions and microwave dielectric properties of the 6H perovskites Ba3BSb2O9, B=Mg, Ca, Sr, Ba. Journal of Solid State Chemistry, 182(3), 479-483. doi:10.1016/j.jssc.2008.11.026en_AU
dc.identifier.govdoc1255en_AU
dc.identifier.issn0022-4596en_AU
dc.identifier.issue3en_AU
dc.identifier.journaltitleJournal of Solid State Chemistryen_AU
dc.identifier.pagination479-483en_AU
dc.identifier.urihttp://dx.doi.org/10.1016/j.jssc.2008.11.026en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1370en_AU
dc.identifier.volume182en_AU
dc.language.isoenen_AU
dc.publisherElsevieren_AU
dc.subjectPhase transformationsen_AU
dc.subjectDielectric propertiesen_AU
dc.subjectPerovskitesen_AU
dc.subjectX-ray diffractionen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectThermal gravimetric analysisen_AU
dc.titleStructures, phase transitions and microwave dielectric properties of the 6H perovskites Ba3BSb2O9, B=Mg, Ca, Sr, Baen_AU
dc.typeJournal Articleen_AU
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