Open AccessThe anharmonic vibration of Li in lithium amide
Author(s) -
Biswajit Paik,
Takuya Hasegawa,
Idaku Ishii,
A. Michigoe,
Takashi Suzuki,
Masayuki Udagawa,
Norio Ogita,
Takayuki Ichikawa,
Yoshitsugu Kojima
Publication year - 2012
Publication title -
applied physics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 442
eISSN - 1077-3118
pISSN - 0003-6951
DOI - 10.1063/1.3703586
Subject(s) - anharmonicity , tetragonal crystal system , phonon , raman spectroscopy , lithium (medication) , lithium amide , ionic bonding , crystal (programming language) , chemistry , condensed matter physics , vibration , materials science , crystal structure , spectroscopy , ion , atomic physics , crystallography , physics , optics , medicine , biochemistry , programming language , organic chemistry , enantioselective synthesis , quantum mechanics , endocrinology , computer science , catalysis
A large amplitude rattling-type anharmonic vibration of Li is possible without guest-host type structure, as we report here for tetragonal LiNH2 crystal. The low temperature (0.4–300 K) specific heat capacity and Raman spectroscopy support the phonon model of site-specific Li activities governed by the symmetry of the potential energy distribution around the Li atoms in LiNH2, which yields the anharmonic Li3 vibration (optical) in one direction (either X or Y axis of the crystal), while the Li1 and Li2 atoms remain silent. Our finding may help to correlate ionic conductivity, thermal, and hydrogenation properties of LiNH2.
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