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IN SITU TEM STUDIES OF FERROELECTRIC PHASE TRANSITIONS IN Ba2NaNb5O15 AND LiTaO3

HU MEI-SHENG FENG DUAN

IN SITU TEM STUDIES OF FERROELECTRIC PHASE TRANSITIONS IN Ba2NaNb5O15 AND LiTaO3

HU MEI-SHENG, FENG DUAN
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  • Received Date:  02 December 1981
  • Published Online:  05 March 1982

IN SITU TEM STUDIES OF FERROELECTRIC PHASE TRANSITIONS IN Ba2NaNb5O15 AND LiTaO3

  • 1. 南京大学物理系

Abstract: In this paper we presented our experimental results of in situ TEM observations of ferroelectric phase transitions in BaBa2NaNb5O15 (Tc =550℃) and LiTaO3 (TC = 660℃). At room temperature the domain patterns are of the scale 0.2-1 μm. Increasing the temperature to near Tc, the micro-domains forming quasi-regular arrays of the scale about several hundreds of angstroms have been observed and interpreted according to a model slightly modified from that of Селок. A strong susceptibility to radiation damage is found in LiTaO3 near phase transition temperature which may be connected with soft modes of phase transitions.

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