Elastic Moduli Of Perovskite-type Rare Earth Rhodium Borides And Carbides 

A. S. Verma1*, R. Bhandari2 and A. Kumar3

1Department of Physics, Banasthali Vidyapith, Rajasthan 304022, India

2Department of Physics, Post Graduate Govt. College, Chandigarh 160011, India

3Department of Physics, K. R. (P.G.) College, Mathura 281004, India

Adv. Mater. Lett., 2014, 5 (3), pp 148-151

DOI: 0.5185/amlett.2013.fdm.02

Publication Date (Web): Feb 02, 2014

E-mail: ajay_phy@rediffmail.com

Abstract


In this paper, semi-empirical formula for the bulk modulus (B in GPa) and shear modulus (G in GPa) of perovskite structured solids are elaborated in terms of lattice constant (a in Å) and product of ionic charges (Za Zx) of the bonding. Values of bulk modulus, of the group ARh3X, (X = B and C) perovskite-type materials exhibit a linear relationship when plotted against the lattice constant (a) normalization, but fall on different straight lines according to the product of ionic charges of the compounds. The resulting expressions can be applied to a broad selection of perovskite (ARh3X = A: large cation with different valence and X: borides and carbides) materials and their modulus predictions are in good agreement with the experimental data and those from ab initio calculations.

Keywords

Rare earth borides, rare earth carbides, bulk modulus, shear modulus microwave-assisted synthesis

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