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

The Electronic Structure and Secondary Pyroelectric Properties of Lithium Tetraborate

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

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MDPI and ACS Style

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.

AMA Style

Adamiv V, Burak Y, Wooten DJ, McClory J, Petrosky J, Ketsman I, Xiao J, Losovyj YB, Dowben PA. The Electronic Structure and Secondary Pyroelectric Properties of Lithium Tetraborate. Materials. 2010; 3(9):4550-4579.

Chicago/Turabian Style

Adamiv, Volodymyr.T.; Burak, Yaroslav.V.; Wooten, David. J.; McClory, John; Petrosky, James; Ketsman, Ihor; Xiao, Jie; Losovyj, Yaroslav B.; Dowben, Peter A. 2010. "The Electronic Structure and Secondary Pyroelectric Properties of Lithium Tetraborate." Materials 3, no. 9: 4550-4579.

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