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The disordered structures and low temperature dielectric relaxation properties of two misplaced-displacive cubic pyrochlores found in the Bi 2 O 3 - M II O-Nb 2 O 5 ( M = Mg, Ni) systems

Nguyen, Hai Binh; Noren, Lasse; Liu, Yun; Withers, Raymond; Wei, Xiayong; Elcombe, Margaret M

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The disordered structures and low temperature dielectric relaxation properties of Bi1.667Mg0.70Nb1.52O7 (BMN) and Bi1.67Ni0.75Nb1.50O7 (BNN) misplaced-displacive cubic pyrochlores found in the Bi2O3-MIIO-Nb2O5 (M=Mg, Ni) systems are reported. As for other recently reported Bi-pyrochlores, the metal ion vacancies are found to be confined to the pyrochlore A site. The B2O6 octahedral sub-structure is found to be fully occupied and well-ordered. Considerable displacive disorder, however, is found...[Show more]

dc.contributor.authorNguyen, Hai Binh
dc.contributor.authorNoren, Lasse
dc.contributor.authorLiu, Yun
dc.contributor.authorWithers, Raymond
dc.contributor.authorWei, Xiayong
dc.contributor.authorElcombe, Margaret M
dc.date.accessioned2015-12-10T22:12:08Z
dc.identifier.issn0022-4596
dc.identifier.urihttp://hdl.handle.net/1885/49498
dc.description.abstractThe disordered structures and low temperature dielectric relaxation properties of Bi1.667Mg0.70Nb1.52O7 (BMN) and Bi1.67Ni0.75Nb1.50O7 (BNN) misplaced-displacive cubic pyrochlores found in the Bi2O3-MIIO-Nb2O5 (M=Mg, Ni) systems are reported. As for other recently reported Bi-pyrochlores, the metal ion vacancies are found to be confined to the pyrochlore A site. The B2O6 octahedral sub-structure is found to be fully occupied and well-ordered. Considerable displacive disorder, however, is found associated with the O′A2 tetrahedral sub-structure in both cases. The A-site ions were displaced from Wyckoff position 16d (frac(1, 2), frac(1, 2), frac(1, 2)) to 96 h (frac(1, 2), frac(1, 2) - ε{lunate}A, frac(1, 2) + ε{lunate}A) while the O′ oxygen was shifted from position 8b (frac(3, 8), frac(3, 8), frac(3, 8)) to Wyckoff position 32e (frac(3, 8) + ε{lunate}o′, frac(3, 8) + ε{lunate}o′, frac(3, 8) + ε{lunate}o′). The refined displacement magnitudes off the 16d and 8b sites for the A and O′ sites were 0.408 Å/0.423 Å and 0.350 Å/0.369 Å for BMN/BNN, respectively.
dc.publisherAcademic Press
dc.sourceJournal of Solid State Chemistry
dc.subjectKeywords: Bismuth compounds; Neutron diffraction; Oxygen; Bi-pyrochlores; Disordered structure refinement; Dielectric relaxation Bi-pyrochlores; Dielectric relaxation; Disordered structure refinement; Powder neutron diffraction
dc.titleThe disordered structures and low temperature dielectric relaxation properties of two misplaced-displacive cubic pyrochlores found in the Bi 2 O 3 - M II O-Nb 2 O 5 ( M = Mg, Ni) systems
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume180
dc.date.issued2007
local.identifier.absfor030206 - Solid State Chemistry
local.identifier.ariespublicationu4217927xPUB187
local.type.statusPublished Version
local.contributor.affiliationNguyen, Hai Binh, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationNoren, Lasse, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationLiu, Yun, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWithers, Raymond, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationWei, Xiayong, Xi'an Jiaotong University
local.contributor.affiliationElcombe, Margaret M, Australian Nuclear Science and Technology Organisation
local.description.embargo2037-12-31
local.bibliographicCitation.issue9
local.bibliographicCitation.startpage2558
local.bibliographicCitation.lastpage2565
local.identifier.doi10.1016/j.jssc.2007.07.003
dc.date.updated2015-12-09T07:49:52Z
local.identifier.scopusID2-s2.0-34548406620
CollectionsANU Research Publications

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