Phase transition at low temperature in NaNbO[sub 3] ceramic

Lanfredi, S.; Lente, M. H.; Eiras, J. A.
April 2002
Applied Physics Letters;4/15/2002, Vol. 80 Issue 15, p2731
Academic Journal
The electric permittivity of the sodium niobate ceramic was investigated in the temperature range from 15 up to 900 K, at frequencies from 100 Hz to 1 MHz. Three anomalies were found in the permittivity curve. A phase transition for NaNbO[sub 3] was assigned to anomaly at around 280 K, while other two ones have previously been reported. In addition, the dielectric permittivity dependence with the temperature and frequency, at temperatures lower than 400 K, showed two regions with typical characteristics of a relaxor ferroelectric materials. © 2002 American Institute of Physics.


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