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Ferroelectrics Volume 400, 2010 - Issue 1
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PYROELECTRIC/PIEZOELECTRIC

Pyroelectric and Ferroelectric Study of Polarisation Reversal in Near-Stoichiometric LiTaO3

Svetlana L. Bravina Department of Detectors of Radiation, Institute of Physics NAS of Ukraine, Kyiv, 03680, Ukraine
,
Nicholas V. Morozovsky Department of Detectors of Radiation, Institute of Physics NAS of Ukraine, Kyiv, 03680, Ukraine
,
David S. Hum E. L. Ginzton Laboratory, Stanford University, Stanford, California, 94305-4088, USA
,
Roger K. Route E. L. Ginzton Laboratory, Stanford University, Stanford, California, 94305-4088, USA
&
Martin M. Fejer E. L. Ginzton Laboratory, Stanford University, Stanford, California, 94305-4088, USA
Pages 185-194 | Received 15 Nov 2009, Published online: 20 Nov 2010
 
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Abstract

Polarization reversal ferroelectric characteristics (charge-, current- capacitance- and pyroresponse- voltage loops) were investigated for vapor transport equilibrated near-stoichiometric LiTaO3. The transition from the unipolar state to asymmetric and symmetric inversely polarized structures (IPS) was realized by applying external voltage.

By photopyroelectric subsurface thermal-wave probing of IPS the position of charged domain boundary and its thickness were estimated. Low (60 V/mm) coercive field process was considered as connected with low (4 μC/cm2) polarization reversal in gradient regions of domain boundaries.

Application of monolithitic IPS for various types of differential pyroelectric detectors is proposed.

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