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SECTION K: PHASE TRANSITIONS AND CRITICAL PHENOMENA

Dilatometric Study on Monoclinic Crystals of Ferroelectric TGS Down to Cryogenic Temperature Region

, , , , , , , & show all
Pages 59-69 | Received 26 Jan 2006, Published online: 09 Mar 2011
 

We have further developed the clip-type strain gauge dilatometer in order to measure an angular deformation by applying the cosine theorem. In this research, not only a linear thermal expansion along three crystallographic axes but also a monoclinic angle β of ferroelectric TGS in the monoclinic system were measured below 380 K down to the cryogenic temperature region. Each of these components showed a clear bend and a typical feature of the second order transition at the Curie temperature. On the other hand, the volume thermal expansion did not show a big change at the Curie temperature.

Acknowledgments

Paper originally presented at IMF-11, Iguassu Falls, Brazil, September 5–9, 2005; received for publication January 26, 2006.

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