Anharmonicity in LiBH4-LiI induced by anion exchange and temperature

作者：Borgschulte A^*; Gremaud R; Kato S; Stadie N P; Remhof A; Zuettel A; Matsuo M; Orimo S I

来源：Applied Physics Letters, 2010, 97(3): 031916.

DOI：10.1063/1.3467260

• boron compounds
• diffusion
• ionic conductivity
• lithium compounds
• phase diagrams
• Raman spectra
• solid solutions
• solid-state phase transformations
• vibrational states

The feasibility of spatially resolved Raman spectroscopy probing diffusion multiples as a high-throughput method to study phase transformations in Li-ion conductors is demonstrated. The method is applied to the pseudobinary LiBH4-LiI system, which shows high Li-ion conductivity in the HT-phase of LiBH4. The vibrational properties measured as a function of composition and temperature corroborate the formation of a solid solution of Li(BH4)(1-c)I-c over nearly the entire phase diagram (0 < c <= 0.8 perpendicular to 0.2). The results shed light on anharmonic effects responsible for the structural phase transformation in this system.

• 出版日期2010-7-19