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Low Temperature Phase Transition of an Orthorhombic Tungsten Bronze Ferroelectric Sr2-xCaxNaNb5O15 |
ZHONG Weilie;ZHANG Peilin;ZHAO Huansui;HAN Zhaozhong*;CHEN Huanchu* |
Department of Physics, Shandong University, Jinan 250100
*Institute of Crystal Materials, Shandong University, Jinan 250100 |
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Cite this article: |
ZHONG Weilie, ZHANG Peilin, ZHAO Huansui et al 1993 Chin. Phys. Lett. 10 183-185 |
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Abstract The dielectric and pyroelectric properties of a new ferroelectric crystal with orthorhombic tungsten bronze structure Sr2-xCaxNaNb5O15 have been investigated in the temperature range of 300 to 10 K. Based on anomalies in the properties and by use of Curie's principle of symmetry, a ferroelectric-ferroelectric phase transition between mm2 and m is found to occur at about 75K. On cooling through the transition, the spontaneous polarization deviates by about two degrees from the two-fold axis [001] to[h0l] direction in the mirror plane.
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Keywords:
77.80.-e
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Published: 01 March 1993
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PACS: |
77.80.-e
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(Ferroelectricity and antiferroelectricity)
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