Arpita Aparajita AN, Sanjay Kumar NR, Chandra S, Amirthapandian S, Shekar NVC, Sridhar K. High-Pressure Synthesis of Manganese Monocarbide: A Potential Superhard Material.
Inorg Chem 2018;
57:14178-14185. [PMID:
30403341 DOI:
10.1021/acs.inorgchem.8b02148]
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Abstract
In this paper, we report for the first time formation of novel manganese monocarbide (MnC) using laser-heated diamond anvil cell (LHDAC). The synthesis was carried out at high pressure-high temperature (HPHT) and subsequently quenched to ambient condition. The formation and reproducibility have been confirmed in the pressure range of 4.7 to 9.2 GPa. Employing contribution of different probes viz.X-ray diffraction (XRD), selected area electron diffraction (SAED), and ab initio electronic structure calculation, the structure of MnC was found to be ZnS type i.e. a cubic lattice with a = 4.4294(2) Å. The bulk modulus has been determined to be 170(5) GPa from in situ high-pressure X-ray diffraction (HPXRD). Hardness of ZnS type MnC is estimated from an empirical relation to be about 40 GPa, making it a potential superhard material.
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