Calorimetric and 23Na MAS NMR study of the phase diagram of NANB1_xTAxO3 solid solutions

Описание

Тип публикации: статья из журнала

Год издания: 2010

Ключевые слова: Asymmetry parameter, Coupling constants, Dielectric studies, Larmor frequencies, Line shape, Reasonable accuracy, Solid solution structures, Temperature range, C (programming language), Nuclear magnetic resonance spectroscopy, Phase diagrams, Sodium, Tantalum oxides, Solid solutions

Аннотация: The heat capacity of NaNb1_xTaxO3 solid solutions was measured in the temperature range 100 to 770 K. The step-like change of phase transition temperature is observed in the T-x phase diagram at concentration x = 0.55. The obtained results are in a good agreement with the data of dielectric studies. The 23Na MAS NMR spectra were obПоказать полностьюtained at Larmor frequency 79.35 MHz using a Bruker AVANCE 300 spectrometer. The quadru-polar coupling constant, (CQ=e2qQ/h) and asymmetry parameter (n) were determined by computer fitting of the NMR line shape using the DMFit software. The found parameters show that solid solution structure is NaTa03-based at 0.7<X ?1 and NaNbO3-based at 0?x?0.5. The spectra in the intermediate region (0.5<x?0.7) can be described at a reasonable accuracy when assuming the coexistence of NaTaO3 and NaNbO3 structures. © 2010 - STC "Institute for Single Crystals".

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Издание

Журнал: Functional Materials

Выпуск журнала: Vol. 17, Is. 1

Номера страниц: 18-23

ISSN журнала: 10275495

Авторы

  • Aleksandrova I.P. (L.Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Ivanov Y.N. (L.Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Sukhovskii A.A. (L.Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Voronov V.N. (L.Kirensky Institute of Physics,Russian Academy of Sciences,Siberian Branch)
  • Bondarev V.S. (Siberian Federal University)

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