Micromechanical Hardness of Strontium Tartrate Trihydrate Crystals

Abstract

The effect of load variation on the microhardness and microcracks of SrC 4 H 4 O 6 . 3H 2 O (STT) single crystals has been studied. The crystals are grown by using a controlled chemical reaction in silica hydrogel medium. We confirm the applicability of Hays and Kendall's law. There is some anisotropy in the hardness observed on different faces. We show different types of cracking in the crystal during loading. Fracture toughness, brittleness index, and yield strength of the grown crystals have also been determined using the fracture mechanism.

Growth and characterization of strontium tartrate pentahydrate crystals

“…In the present study we report the growth and characteristics of strontium tartrate pentahydrate (STP) single crystals, bearing the chemical formula SrC 4 H 4 O 6 .5H 2 O, which shows that the crystal grown contains five coordinated water molecules. Arora et al [13] have reported the growth of Strontium tartrate trihydrate with the chemical formula SrC 4 H 4 O 6 .3H 2 O. In the present study , growth of strontium tartrate which is different not only in respect of number of water molecules from the one grown by Arora et al but also different in terms of cell parameters, morphological development, thermal stability and FTIR spectroscopic results.…”

“…3) whereas it decreases linearly or exponentially (Figs. 4,6) in some other cases.Arora et al [13] also observed such a type of behavior regarding the dependence of number of crystals on various growth parameters. According to them, the trends are consequence of three dimensional nucleation rates, diffusion rate in gels due to variation in gel structure which may include pore size, cross linkage of cell boundaries etc and the diffusion rate in the gel due to changes in the hydrostatic pressure resulting from height of the upper reactant solution.…”

Growth and characterization of semiorganic nonlinear optical tetrakis thiourea nickel chloride single crystals

“…The nonlinear behavior of the microhardness of the crystal along (110) plane may be due to cleavage plane of the sample. Hardness value of TTNC crystal differs from one plane to another which confirms the microhardness anisotropy [14]. The ratio of difference in maximum hardness of two planes to the maximum value of microhardness of the crystal gives the anisotropy coefficient A, which is given by the equation, A = ∆H v / H v .…”

Micromechanical behaviour of gel grown pure and doped potassium hydrogen tartrate single crystals

“…The study of microhardness of crystals, pure or doped and its dependence on dislocations has been considered as of great interest for transducer applications involving mechanical vibrations 22, 23. The microhardness studies of both pure and doped strontium tartrate are reported in the literature 24, 25. Some computed mechanical parameters of Cadmium tartrate pentahydrate crystals have also been reported in the literature 26.…”