The Electronic Structure and Secondary Pyroelectric Properties of Lithium Tetraborate

Materials

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

DOI  :  10.3390/ma3094550

来源: DOAJ

【 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 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.

【 授权许可】

Unknown