STRUCTURAL AND MECHANICAL PROPERTIES ON Tb3+ DOPED KBr SINGLE CRYSTALS

Abstract

Tb3+
doped KBr single crystals is grown by Bridgeman Stockbarger technique. The grown crystal was
subjected to powder X-ray Diffraction (PXRD), Fourier Transform Infrared analysis (FTIR) and Vicker’s microhardness
(Hv). The average crystallite size was calculated using well known Debye Scherrer’s formula and found in the range
of 8.5μm. The presence of various functional groups has been identified from FTIR studies with their vibrating
frequencies. The mechanical property was studied by vicker’s microhardness indenter. Vicker’s hardness value (Hv) are
calculated for selected applied load and it is found to be increasing with increasing applied load. The Mayer’s
index number(n) is calculated to be 0.3, the crystal system belongs to hard material category. The Elastic stiffness
constant (C11) value is 5989X1011MPa which is calculated using Wooster’s empirical relation.