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Growth, optical, luminescence, thermal, mechanical and etching studies of a Mixed Alkali Oxalate K0.56 (NH4) 0.44 (H2C2O4) (HC2O4) (H2O)2 single crystal

M. NIROSHA1, S. KALAINATHAN1,*

Affiliation

  1. Center for Crystal Growth, VIT University, Vellore – 632014, Tamilnadu, India

Abstract

Single crystals of mixed alkali oxalate K0.56 (NH4) 0.44 (H2C2O4) (HC2O4) (H2O) 2 have synthesized and grown by slow evaporation solution growth technique. The structural, thermal, optical and mechanical property has studied for the grown crystal. Single crystal xrd revealed that the crystal belongs to triclinic system with space group P-1. The presences of functional groups in the crystallized material have confirmed using the FTIR vibrational spectrum. The optical absorbance spectrum from 190 to 1100 nm shows the cut-off wavelength occurs at 300 nm. The material shows its transparency in the entire region of the visible spectrum. The PL spectrum of the title compound shows the peak observed at 520 nm is due to the ligands present in the compound. Thermogravimetric and differential thermal analysis reveal the thermal stability of the grown crystal. Etching study reveals the surface features of the grown crystal. The Vickers microhardness studies have carried out on the (100) plane to understand the mechanical properties of the grown crystal. Mechanical hardness of the grown crystal MAO has studied, and Vickers hardness number has calculated. The hardness of the title compound increases on increasing the load. The Meyer’s index number (n), and the stiffness constants for different loads has calculated and reported..

Keywords

Crystal growth, Thermogravimetric analysis, Luminescence, Mechanical studies, Etching studies.

Citation

M. NIROSHA, S. KALAINATHAN, Growth, optical, luminescence, thermal, mechanical and etching studies of a Mixed Alkali Oxalate K0.56 (NH4) 0.44 (H2C2O4) (HC2O4) (H2O)2 single crystal, Optoelectronics and Advanced Materials - Rapid Communications, 8, 1-2, January-February 2014, pp.49-56 (2014).

Submitted at: Sept. 10, 2013

Accepted at: Jan. 22, 2014