R. Gopalakrishnan

Growth and characterisation of benzaldehyde semicarbazone (BSC) single crystals

Abstract Single crystals of potential organic nonlinear optical materials of Benzaldehyde Semicarbazone (BSC) were grown by slow evaporation technique. The grown crystals were identified by X-ray diffraction method. The functional groups were identified from FT-IR spectrum. UV-visible and thermal gravimetric analyses were made.

Growth of oxide crystals : effect of change in melt depth

Abstract The present investigation deals with the effect of the change in the melt depth in the crucible (during pulling) on the temperature distribution in the melt and on the critical crystal rotation rate, and hence on the growth of Bi12SiO20, Bi12GeO20, Bi4Si3O12 and TeO2 oxide crystals. The need to terminate the growth before a critical value of the melt depth is reached and the difficulty in getting good quality crystals beyond this point is reported.

Some aspects of growth and characterisation of BSO and BGO crystals

Abstract Bismuth silicon oxide (BSO) and bismuth germanium oxide (BGO) crystals were grown by the Czochralski technique and the various parameters such as crystal rotation rate, pulling rate and growth temperature have been optimised for bubble free growth.

Microscopy observations of Cz-grown BSO (Bi12SiO20) crystals

Abstract The effect of the seed rotation rate on the morphology of Bi 12 SiO 20 (BSO) crystals has been investigated. The grown crystals were investigated by optical and scanning electron microscopy. The factors responsible for core formation, precipitates, microcracks and faceting are discussed.