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Ferroelectrics Volume 460, 2014 - Issue 1
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Original Articles

Calculation of the Infrared Frequencies as a Function of Temperature Using the Volume Data in the Ferroelectric Phase of NaNO2

H. Yurtseven Department of Physics, Middle East Technical University, 06531, Ankara, Turkey
&
A. Kiraci Department of Physics, Middle East Technical University, 06531, Ankara, Turkey; Department of Materials Science and Engineering, Çankaya University, Yenimahalle, 06810, Ankara, Turkey
Pages 149-156 | Received 12 Jul 2013, Published online: 28 Feb 2014
 
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Abstract

We calculate the temperature dependence of the infrared frequencies of the TO and LO modes with the symmetries of A1, B1 and B2 mainly in the ferroelectric phase of NaNO2. This calculation is carried out using the volume dependence of the infrared frequencies through the mode Grüneisen parameter in this crystal. The volume dependences of the infrared frequencies are fitted to the observed frequencies by using constant mode Grüneisen parameter in the ferroelectric phase of NaNO2. Our results show that this method of calculating the infrared frequencies describes the observed behaviour of NaNO2 adequately.

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