Displacive ordering transitions in perovskite-like AgNb1/2Ta1/2O3./sub

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F10%3A00437718" target="_blank" >RIV/68378271:_____/10:00437718 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1021/cm101263p" target="_blank" >http://dx.doi.org/10.1021/cm101263p</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/cm101263p" target="_blank" >10.1021/cm101263p</a>

Result language

angličtina

Original language name

Displacive ordering transitions in perovskite-like AgNb1/2Ta1/2O3./sub

Original language description

Displacive phase transitions in perovskite-like solid solutions AgNb1/2Ta1/2O3 were studied using several diffraction and spectroscopic techniques sensitive to average and local structures. The room-temperature phase of AgNb1/2Ta1/2O3 (M-2) is analogousto that of the end-member AgNbO3 and exhibits Pbcm orthorhombic symmetry with lattice parameters root 2a(c) x root 2a(c) x 4a(c) (a(c) approximate to 4 angstrom refers to an ideal cubic perovskite cell). This structure combines complex octahedral tiltingand average antipolar B-cation (Nb, Ta) displacements. Similar to AgNbO3, at higher temperatures, B-cations are disordered among multiple sites displaced along (111), directions. Partial ordering of local B-cation displacements is manifested in the so-called M-3 <-> M-2 transition, which preserves the average Pbcm symmetry determined by the tilted octahedral framework; the transition is accompanied by a broad exploitable maximum of dielectric constant. Ta substitution suppresses this or

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BM - Solid-state physics and magnetism

OECD FORD branch

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Project

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Continuities

Z - Vyzkumny zamer (s odkazem do CEZ)

Publication year

2010

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Chemistry of Materials

ISSN

0897-4756

e-ISSN

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Volume of the periodical

22

Issue of the periodical within the volume

17

Country of publishing house

US - UNITED STATES

Number of pages

9

Pages from-to

4987-4995

UT code for WoS article

000281461100019

EID of the result in the Scopus database

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