Department of Physics and Astronomy: Publications and Other Research


Date of this Version



Physics Letters A 374 (2010) 891–895


© 2009 Elsevier B.V.

This document is a U.S. government work and is not subject to copyright in the United States.



We find a pyroelectric current along the {110} direction of stoichiometric Li2B4O7 so that the pyroelectric coefficient is nonzero but roughly 10−3 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 C_33^D contributing to 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 an inverse piezoelectric effect occurs at the (110) surface but not the (100) surface. Both effects along the {110} direction or at the (110) surface are distinct the conventional as a bulk pyroelectric effect.