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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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

Název v anglickém jazyce

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

Popis výsledku anglicky

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BM - Fyzika pevných látek a magnetismus

OECD FORD obor

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Projekt

—

Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

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

Název periodika

Chemistry of Materials

ISSN

0897-4756

e-ISSN

—

Svazek periodika

22

Číslo periodika v rámci svazku

17

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

4987-4995

Kód UT WoS článku

000281461100019

EID výsledku v databázi Scopus

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