Study on thermal characterization of Zn-doped KNbO3 crystals

Zn-doped KNbO3 (1 to 8 mol% ZnO in melt) crystals were grown by the Kyropoulos method. The composition of the 1 mol% Zn-doped samples was determined by electron probe microanalysis. The results show that the crystals are no longer Nb-rich, but still contain some potassium vacancies. The thermal expa...

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Bibliographic Details
Published in:Materials letters 1997-03, Vol.30 (4), p.315-319
Main Authors: BING, Y. H, XU, D, GUO, S. Y, JIANG, M. H, YUAN, D. R, LIU, M. G, HOU, W. B, YIN, X, SUN, S. Y, ZHANG, H. J, XU, H. Y, ZHANG, Q
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Growth from melts
zone melting and refining
Materials science
Methods of crystal growth
physics of crystal growth
Physics
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Summary:Zn-doped KNbO3 (1 to 8 mol% ZnO in melt) crystals were grown by the Kyropoulos method. The composition of the 1 mol% Zn-doped samples was determined by electron probe microanalysis. The results show that the crystals are no longer Nb-rich, but still contain some potassium vacancies. The thermal expansion results and Raman spectra of doped and undoped samples were compared. The doped samples' thermal expansion coefficients parallel to the (010) plane decrease compared to the undoped samples. Compared to the undoped samples, the doped crystals' Raman spectra bands move to higher wave numbers and their temperature dependence decreases. For the Zn-doped KNbO3, the temperature dependence of the NbO6 octahedral distortion and Nb5+ displacement decrease, when compared to pure KNbO3. 18 refs.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(96)00216-9