Departmental Seminar

Investigation on unidirectional growth of organic single crystal by Sankaranarayanan-Ramasamy method and its characterization for scintillator device fabrication

Date & time

Fri 21 Apr 2017, 2–3pm

Location

Room:

RSPE Link Seminar Room (414)

Audience

Members of RSPE welcome

Contact

(02)61250356
Professor S. Kalainathan
Centre for Crystal Growth, VIT university Vellore, India

An organic single crystal of 1,3,5-Triphenylbenzene (3PB) has been grown from solution by Unidirectional Sankaranarayanan-Ramasamy (SR) method within a period of 72 days. The size of grown crystal was 30 mm diameter and 40 mm length. The solubility of 3PB material was determined in five different solvents with various temperatures and tetrahydrofuran (THF) was identified as a suitable solvent for bulk crystallization. Metastable zone width of the saturated solution was determined to optimize the growth period. Cell parameters of the grown 3PB crystal were confirmed by single crystal X-ray diffraction, it belongs to orthorhombic crystal system. Fluorescence emission spectrum was recorded at 360 nm. Prompt and delayed fluorescence lifetime of 3PB single crystal has been calculated at 12 ns and 30 ns respectively. Thermogravimetric (TG-DTA) measurement was performed to the title compound, and it was stable up to 164 ̊C. Growth pattern and the surface defect were examined by the optical microscope and it reveals the regular shapes of etch pits which are in triangular shape. The wide range gamma energy responses of title crystal was investigated using the different energy sources such as 133Ba (356kV), 137Cs (662 kV), 60Co (1333kV), 22Na (511kV), and 22Na (1275kV).

Prof.S.Kalainathan is currently Director, Centre for Crystal Growth, VIT University, Vellore, Tamilnadu, India. He received his M.Sc  in Physics from the Madras University of Chennai in 1987 and PhD in Materials  Science from Anna University, Chennai in 1991.  He has been awarded JSPS Invitation Fellowship, University of Tokyo in 2015, Prof.P.Ramasamy National Award for Crystal Growth in 2009, Most Active Researcher Award in 2008 and Best Teacher Award in 1997 by VIT University, Visiting Professor, Akita University in 2014. He has published/co-published over 200 journal papers, including two book chapters. He is also an inventor in 2 Indian patents related to laser shock peening and filed 4 patents in the same field. His research interests include crystal growth by Bridgemann and Flux techniques, solar cell and magnetic memories by thin film, bio-nano materials, artificial biological stones by gel growth techniques and surface medication of metals and alloys by laser shock peening method. Prof. Kalainathan is an executive member of Indian Association for Crystal Growth.

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