Elsevier

Solid State Communications

Volume 88, Issue 9, December 1993, Pages 727-730
Solid State Communications

Sr2+-doping effect on the phase transition in Pb5Ge3O11 single crystals

https://doi.org/10.1016/0038-1098(93)90633-XGet rights and content

Abstract

The dielectric and the pyroelectric measurements of Sr2+-doped Pb5Ge3O11 single crystals were carried out in the frequency range 100 Hz to 15 MHz from room temperature up to 600°C. With increasing Sr2+-concentration, ferroelectric phase transition temperatures shifted to lower temperature and the phase transitions were diffused. The deviation from Curie-Weiss behavior of the dielectric constant was analyzed on the basis of Benguigui's theory [L. Benguigui, Solid State Commun. 14, 669 (1974)]. Estimation of the local order parameter suggests that the diffuse phase transition of Sr2+-doped Pb5Ge3O11 single crystal is caused by the local polarization due to a positional disorder.

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