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The p–T phase diagram of KNbO3 by a dielectric constant measurement |
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| Authors: | Y. Kobayashi S. Endo K. Deguchi L. C. Ming G. Zou |
| Affiliation: | a Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan b Department of Materials Science, Shizuoka Institute of Science and Technology, Fukurori, Shizuoka 437-8555, Japan c Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, HI 96822, USA d National Laboratory of Superhard Materials, Jilin University, Changchun 130023, People's Republic of China |
| Abstract: | A dielectric constant measurement was carried out on perovskite-type ferroelectrics KNbO3 over a wide range of temperature under high pressure. The temperature- and pressure-dependence of the dielectric constant clarified that all temperatures of the transitions from the ferroelectric rhombohedral to orthorhombic, to tetragonal and then to the paraelectric cubic phase, decrease with increasing pressure. These results indicate that the orthorhombic–tetragonal transition takes place at 8.5 GPa and the tetragonal–cubic transition at 11 GPa, at room temperature. |
| Keywords: | A. Ferroelectrics D. Phase transitions E. High pressure |
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