ORCID Profile
0000-0002-3837-5946
Current Organisation
University of Aveiro
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Publisher: American Chemical Society (ACS)
Date: 18-12-2009
DOI: 10.1021/CM903170T
Publisher: American Chemical Society (ACS)
Date: 05-08-2009
DOI: 10.1021/CM901644E
Publisher: Elsevier BV
Date: 10-2002
Publisher: Elsevier BV
Date: 2003
Publisher: American Chemical Society (ACS)
Date: 18-04-2013
DOI: 10.1021/JA3109328
Abstract: The high-temperature cubic form of bismuth oxide, δ-Bi2O3, is the best intermediate-temperature oxide-ionic conductor known. The most elegant way of stabilizing δ-Bi2O3 to room temperature, while preserving a large part of its conductivity, is by doping with higher valent transition metals to create wide solid-solutions fields with exceedingly rare and complex (3 + 3)-dimensional incommensurately modulated "hypercubic" structures. These materials remain poorly understood because no such structure has ever been quantitatively solved and refined, due to both the complexity of the problem and a lack of adequate experimental data. We have addressed this by growing a large (centimeter scale) crystal using a novel refluxing floating-zone method, collecting high-quality single-crystal neutron diffraction data, and treating its structure together with X-ray diffraction data within the superspace symmetry formalism. The structure can be understood as an "inflated" pyrochlore, in which corner-connected NbO6 octahedral chains move smoothly apart to accommodate the solid solution. While some oxide vacancies are ordered into these chains, the rest are distributed throughout a continuous three-dimensional network of wide δ-Bi2O3-like channels, explaining the high oxide-ionic conductivity compared to commensurately modulated phases in the same pseudobinary system.
Publisher: Elsevier BV
Date: 15-07-2007
Publisher: American Chemical Society (ACS)
Date: 02-05-2018
Publisher: American Chemical Society (ACS)
Date: 21-03-2007
DOI: 10.1021/CM070096X
Publisher: Elsevier BV
Date: 12-2007
Location: Belarus
No related grants have been discovered for Aleksey Yaremchenko.