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Ferroelectrics Volume 464, 2014 - Issue 1: Proceedings of the Thirteenth International Meeting on Ferroelectricity (IMF-13)
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Section C: Characterization of Ceramics (continued)

Raman Spectroscopic Study of Ferroelectric Sn-Doped SrTiO3

Tsuguhito NakanoDepartment of Engineering Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu-shi, Tokyo, 182-8585, JapanCorrespondence[email protected]
,
Yu MikamiDepartment of Engineering Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu-shi, Tokyo, 182-8585, Japan
,
Kohji AbeDepartment of Engineering Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu-shi, Tokyo, 182-8585, Japan
,
Shoichiro SuzukiMurata Manufacturing Company, Limited, Nagaokakyo, Kyoto617-8555, Japan
,
Kenji AkiyamaMurata Manufacturing Company, Limited, Nagaokakyo, Kyoto617-8555, Japan
&
Akira AndoMurata Manufacturing Company, Limited, Nagaokakyo, Kyoto617-8555, Japan
Pages 72-79 | Received 02 Sep 2013, Accepted 09 Oct 2013, Published online: 01 May 2014
 
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Abstract

We measured the Raman spectra of ferroelectric Sn-doped SrTiO3, (Sr1-aSna)(Ti1-bSnb)O3 (x = a + b = 0.1, 0.05 and 0.02) in the temperature range from 300 to 20 K. At room temperature, polar transverse optic modes were observed; which are forbidden in Oh cubic symmetry. The soft mode showed no freezing but remained at constant frequency; it split into two peaks at low temperature. Several modes became active through zone folding below 150 K. Instead of freezing of the soft mode, a relaxation mode related to ferroelectricity was found in the low frequency region.

Acknowledgment

The authors thank K. Deguchi and H. Kasatani for their helpful discussions.

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