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Fizika Tverdogo Tela, 2015 Volume 57, Issue 3, Pages 461–464 (Mi ftt11323)

This article is cited in 7 papers

Proceedings of the XX All-Russia Conference on Physics of Ferroelectrics (VKS-XX)

Second harmonic generation study of local polar inhomogeneities in Pb$_3$(MgNb$_2$)O$_9$

A. M. Pugacheva, V. I. Kovalevskiĭa, V. K. Malinovskiia, M. A. Malitskayab, S. I. Raevskayab, I. P. Raevskiib, N. V. Surovtseva

a Institute of Automation and Electrometry, Siberian Branch of Russian Academy of Sciences, Novosibirsk
b Research Institute of Physics, Southern Federal University, Rostov-on-Don

Abstract: The temperature dependence of the second harmonic generation in the lead magnesium niobate Pb$_3$(MgNb$_2$)O$_9$ crystal has been studied. It has been shown that the second harmonic generation in the crystal occurs in local non-centrosymmetric regions in the sample bulk, whereas a similar response from a fine powder is caused by effects associated with decreasing grain sizes. Maximum changes in polarization in local regions occur near the Vogel–Fulcher temperature in the range of 200–270 K. In the same temperature range, according to the published data, gradual freezing of polar regions and the formation of an infinite cluster is assumed.


 English version:
Physics of the Solid State, 2015, 57:3, 472–475

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