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Materials 2010, 3(9), 4550-4579; doi:10.3390/ma3094550
Review

The Electronic Structure and Secondary Pyroelectric Properties of Lithium Tetraborate

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1 Institute of Physical Optics, 23 Dragomanov Street, Lviv 79005, Ukraine 2 Air Force Institute of Technology, 2950 Hobson Way, Wright Patterson Air Force Base, OH 45433-7765, USA 3 Deptment of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, Theodore Jorgensen Hall, 855 North 16th Street, University of Nebraska-Lincoln, Lincoln, NE 68588-0299 , USA 4 J. Bennett Johnston Sr. Center for Advanced Microstructures and Devices, Louisiana State University, 6980 Jefferson Highway, Baton Rouge, LA 70806, USA
* Author to whom correspondence should be addressed.
Received: 26 July 2010 / Accepted: 19 August 2010 / Published: 1 September 2010
(This article belongs to the Special Issue Advances in Ferroelectric & Piezoelectric Materials)
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Abstract

We review the pyroelectric properties and electronic structure of Li2B4O7(110) and Li2B4O7(100) surfaces. There is evidence for a pyroelectric current along the [110] direction of stoichiometric Li2B4O7 so that the pyroelectric coefficient is nonzero but roughly 103 smaller than along the [001] direction of spontaneous polarization. Abrupt decreases in the pyroelectric coefficient along the [110] direction can be correlated with anomalies in the elastic stiffness  contributing to the concept that the pyroelectric coefficient is not simply a vector but has qualities of a tensor, as expected. The time dependent surface photovoltaic charging suggests that surface charging is dependent on crystal orientation and doping, as well as temperature.
Keywords: oxide pyroelectric; band structure of insulators; surface states; secondary pyroelectric effects; lithium tetraborate oxide pyroelectric; band structure of insulators; surface states; secondary pyroelectric effects; lithium tetraborate
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Adamiv, V.; Burak, Y.; Wooten, D.J.; McClory, J.; Petrosky, J.; Ketsman, I.; Xiao, J.; Losovyj, Y.B.; Dowben, P.A. The Electronic Structure and Secondary Pyroelectric Properties of Lithium Tetraborate. Materials 2010, 3, 4550-4579.

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