期刊
SOLID STATE COMMUNICATIONS
卷 145, 期 9-10, 页码 487-492出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ssc.2007.12.011
关键词
insulators; crystal structure and symmetry; phonons; inelastic light scattering
资金
- National Research Foundation of Korea [과C6B2608, 2006-331-C00088] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The dielectric constant of polycrystalline LiH2PO4 has been measured between 297 and 17 K. No marked changes were observed over this range, indicating that the room-temperature orthorhombic phase persisted up to 17 K. Raman spectra of polycrystalline LiH2PO4 were also measured at 297, 200, and 70 K in the frequency shift region of 15-4000 cm(-1) with Raman-active vibrational modes naively assigned to low-frequency (0-300 cm(-1)) external and high-frequency (300-4000 cm(-1)) internal modes. In addition to the internal modes of the PO4 tetrahedra, the internal modes of the LiO4 tetrahedra spectroscopically manifested themselves between 390-500 cm(-1). This frequency range overlaps those of v(2) (PO4) and v(4) (PO4). The LiH2PO4O-H vibrational frequencies were in good agreement with crystallographic reports that there are two types of hydrogen bonds: intermediate (long bonds) and strong (short bonds). (C) 2007 Elsevier Ltd. All rights reserved.
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