The Electronic Structure and Secondary Pyroelectric Properties of Lithium Tetraborate

Materials

Volodymyr.T. Adamiv¹  Yaroslav.V. Burak¹  David. J. Wooten²  John McClory²  James Petrosky²  Ihor Ketsman³  Jie Xiao³  Yaroslav B. Losovyj³ 

[1] Institute of Physical Optics, 23 Dragomanov Street, Lviv 79005, Ukraine; E-Mails:;Air Force Institute of Technology, 2950 Hobson Way, Wright Patterson Air Force Base, OH 45433-7765, USA; E-Mails:;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; E-Mails:

关键词: oxide pyroelectric;    band structure of insulators;    surface states;    secondary pyroelectric effects;    lithium tetraborate;   

DOI  :  10.3390/ma3094550

来源: mdpi

【 摘 要 】

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 stiffnesscontributing 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.

【 授权许可】

CC BY   
© 2010 by the authors; licensee MDPI, Basel, Switzerland.