Nickel sulfate hexahydrate (NSH) crystals are commercially available as Ultraviolet light filters and UV sensors. They are particularly useful in solar-blind optical systems and sensing devices, which seek to identify the presence of UV light sources in the UV missile warning band [1, 2]. In order to improve the transmittance and the dehydration temperature, the two important parameters of a crystal when used as UV filter, other nickel sulfate based crystals such as ANSH, KNSH, CNSH etc. have been prepared [3-5].

In the present work, using a new unidirectional crystal growth from solution called Sankaranarayana-Ramasamy method (SR), a cylindrical shape CoNi(SO₄)₂·12H₂O (CNSH) crystal in the [001] direction has been grown.

The advantage of this method over the one applied by Su et al [5] lies in the nature of the SR method which offers a solution growth method at room temperature involving less-sophisticated equipment to grow unidirectional single crystal with cylindrical morphology, 100% solute–crystal conversion efficiency and ease in scaling up of crystal diameter [6]. The grown crystal was subjected to X-ray diffraction, UV-Vis spectroscopy and TGA/DTA analysis. It was observed that the grown crystal had three sharp discontinuous transmission bands in the range from ultraviolet to near IR wavelengths with transmission efficiency about 77.20% at 305 nm. This value is very near to the value obtained by Su et al] 5[.

[1] S. Livneh, S. Selin, I. Zwieback, and W. Ruderman, US Patent 6, 452, 189, (2002).

[2] M. Hemmati and H. Rezagholipour Dizaji, Cryst. Res. Technol. 47, (2012) 703.

[3] N. L. Sizova, V. L. Manomenova, E. B. Rudneva and A. E.Voloshin, J. Crystallography Reports 52 (2007) 884.

[4] Y. He, J. Chen, G.o Su, X.n Zhuang, G. Lee and R. Jiang J. Cryst. Growth 233 (2001) 809.

[5] G. Su, X. Zhuang, Y. He, Z. Li, G. Li, J. Ma, G. Wang, and Z. Huang, Cryst. Res. Technol. 38 (2003) 1087.

[6] N. Balamurugan, M. Lenin, G. Bhagavannarayana, and P. Ramasamy, Cryst. Res. Technol. 42, 151 (2007).

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