Vibrational properties of hexagonal LiBC: Infrared and Raman spectroscopy

[摘要] The paper presents infrared reflectivity and micro-Raman scattering spectra of LiBC powder pellets. The experiment allowed assignment of frequencies of all infrared and Raman active zone-center modes: E-1u(LO) at 1262 cm(-1) and 381 cm(-1), E-2g at 1172 cm(-1) and 174 cm(-1), and A(2u)(LO) at 825 cm(-1) and 545 cm(-1). Results are compared with available ab initio calculations; prediction of large Born effective charges on the nodes of B-C graphene sheets is confirmed.

[发布日期] 2003-12-01

[关键词] SUPERCONDUCTIVITY;SCATTERING