The influence of metallic substitution on the physical properties of manganese mercury thiyocyanate crystals by G. P. Joseph, I. Korah, K. Raja Rajan, P. C. Thomas, M. Vimalan, J. Madhavan, and P. Sagayaraj

Crystal Research and Technology

Cryst. Res. Technol. 42, 295 (2007) - Abstract -

The influence of metallic substitution on the physical properties of manganese mercury thiyocyanate crystals

G. P. Joseph, I. Korah*, K. Raja Rajan**, P. C. Thomas, M. Vimalan, J. Madhavan, and P. Sagayaraj

Department of Physics, Loyola College, Chennai-600 034, India
*Department of Physics, St.George’s College, Aruvithura, 686 122 , India
**Department of Physics, R.V.Govt. Arts College, Chengalpattu-603 001, India

Keywords	metallic substitution, second harmonic generation, decomposition temperature, VHN, NLO crystals
PACS	78.40.-q, 65.40.-b, 62.20.x, 77.22-d, 72.40.+w
DOI	10.1002/crat.200610816

Good optical grade single crystals of pure, Cd²⁺ and Mg²⁺ doped Manganese Mercury Thiyocyanate (MMTC) crystals are grown by slow solvent evaporation technique at room temperature. Single crystal XRD studies reveal that the incorporation of metallic dopants has not changed the structure of the parent crystal. The SHG efficiencies of the pure and doped samples of MMTC are measured by Kurtz Perry powder method and the results are compared with urea. It is evident from microhardness study that the presence of dopants has increased the mechanical strength of MMTC crystal. The TG/DTG studies confirm that the thermal decomposition temperatures of pure (353°C), Mg²⁺ doped (363°C ) and Cd²⁺ doped (365°C) MMTC are relatively high when compared to other NLO crystals of the same family.

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