title: Synthesis and characterization of a new ternary imide-Li2Ca(NH)2.
abstract: The ternary imide Li(2)Ca(NH)2 was successfully synthesized by dehydrogenating a mixture of LiNH(2) and CaH(2) at a molar ratio of 2:1 in a stream of purified argon at 300 degrees C. A powder X-ray diffraction measurement revealed that Li(2)Ca(NH)2 was of the trigonal anti-La(2)O(3) structure (space group Pm1) with lattice constants of a = 3.5664(3)A and c = 5.9540(8) A. Ca occupied the 1b site (0, 0, 1/2), Li occupied the 2d site (1/3, 2/3, 0.8841(22)), and N occupied the 2d site (1/3, 2/3, 0.2565(15)). Nuclear magnetic resonance and X-ray absorption fine structure analyses demonstrated that each Li ion was coordinated with four imide ions and each Ca ion was coordinated with six imide ions.
authors.affiliation: Department of Physics, National University of Singapore, 10 Kent Ridge Crescent, Singapore 117542.
authors.forename: Guotao
authors.initials: G
authors.lastname: Wu
authors.forename: Zhitao
authors.initials: Z
authors.lastname: Xiong
authors.forename: Tao
authors.initials: T
authors.lastname: Liu
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Liu
authors.forename: Jianjiang
authors.initials: J
authors.lastname: Hu
authors.forename: Ping
authors.initials: P
authors.lastname: Chen
authors.forename: Yuanping
authors.initials: Y
authors.lastname: Feng
authors.forename: Andrew T S
authors.initials: AT
authors.lastname: Wee