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Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of ChalcogenidoplumbatesII or IV
Published on: December 29, 2016
Investigations on structural determination of semi-transition-metal borides
Menglong Wang1, Chang Liu, Mao Wen
1State Key Laboratory of Superhard Materials, Key Laboratory of Automobile Materials of MOE, and Department of Materials Science, Jilin University, Changchun 130012, P. R. China. liquan777@jlu.edu.cn.
Abstract:
Lack of systematic investigations on their dynamical and energetic stability preclude the full understanding of the structural determination and the corresponding mechanical properties for the semi-transition-metal borides ε2B (ε = Ti, V, Cr, Mn, Fe, Co, Ni, Nb, Mo, Ta, and W). The present energetic calculations show ν2B (ν = Ti, V, Cr, Nb, Mo, Ta and W) with the long-assumed I4/mcm symmetry are dynamically unstable, stemming from the large volume required to accommodate the boron atom at equilibrium. By freezing the unstable phonon mode, I4/m structure is predicted to be both energetically and dynamically stable. The structural stabilities for these compounds at finite temperature have been identified by the calculated Gibbs free energies and ab initio molecular dynamic simulation.
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