High-Pressure Melting Curve of Zintl Sodium Silicide NaSi by In Situ Electrical Measurements.

Author(s) Courac, A.; Le Godec, Y.; Renero-Lecuna, C.; Moutaabbid, H.; Kumar, R.; Coelho-Diogo, C.; Gervais, C.; Portehault, D.
Journal Inorg Chem
Date Published 2019 Aug 19

The inorganic chemistry of the Na-Si system at high pressure is fascinating, with a large number of interesting compounds accessible in the industrial pressure scale, below 10 GPa. In particular, NaSi is stable in this whole pressure range and thus plays an important role in understanding the thermodynamics and kinetics underlying materials synthesis at high pressures and high temperatures. In the present work, the melting curve of the Zintl compound NaSi made of Na and Si tetrahedral cluster ions is studied at high pressures up to 5 GPa, by using in situ electrical measurements. During melting, the insulating NaSi solid transforms into an ionic conductive liquid that can be probed through the conductance of the whole high-pressure cell, i.e., the system constituted of the sample, the heater, and the high-pressure assembly. NaSi melts congruently in the studied pressure range, and its melting point increases with pressure with a positive slope d/d of 20(4) K/GPa.

DOI 10.1021/acs.inorgchem.9b01108
ISSN 1520-510X
Citation Inorg Chem. 2019;58(16):1082210828.

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