7Li NMR investigation of Li-Li pair ordering in the paraelectric phase of weakly substitutionally disordered K(1-x)Li(x)TaO3

0353450 - FZÚ 2011 RIV US eng J - Článek v odborném periodiku
Zalar, B. - Lebar, A. - Ailion, D.C. - Kuzian, R. O. - Kondakova, I.V. - Laguta, Valentyn
7Li NMR investigation of Li-Li pair ordering in the paraelectric phase of weakly substitutionally disordered K(1-x)Li(x)TaO3.
Physical Review Letters. Roč. 105, č. 22 (2010), 226402/1-226402/4. ISSN 0031-9007. E-ISSN 1079-7114
Grant CEP: GA AV ČR IAA100100810
Výzkumný záměr: CEZ:AV0Z10100521
Klíčová slova: ion ordering * impurity ions * crystal structure * nuclear magnetic resonance
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 7.621, rok: 2010

Beaking of the average cubic symmetry in Li-doped potassium tantalate was observed with quadrupole-perturbed 7Li NMR far above the nominal glass transition temperature. The observed spectrum consists of contribution from both isolated Li ions and from Li-Li pairs. It was found that the various Li-Li pair configurations are not equally probable. These are the first direct observation of biased ion ordering that persists at temperatures high above the glass phase.
Trvalý link: http://hdl.handle.net/11104/0192698