Growth of KCl_1–xBr_x Mixed Crystals with Different Composition Percent and Study of KBr Concentration Effect on Optical Characteristics of Mixed Crystals

Feridoun Samavat, Ebrahim Haji-Ali, Sajad Shahmaleki, Somayeh Solgi

Physics Department, Bu-Ali Sina University, Hamedan, Iran.
Physics Department, Imam Hossein University, Tehran, Iran.

DOI: 10.4236/ampc.2012.22015                

Abstract

In the present research, mixed crystals KCl_1–xBr_x (x = 0.1, 0.3, 0.5, 0.7 & 0.9) were grown by Czochralski method. Then some analysis such as chemical etching, XRD, and absorbing spectrum were established on the irradiated crystals by γ-ray. The results of this research show that configuration of defects in mixed crystals in contrast with pure crystals is different. Somehow that type and percentage of cumulative composition cause to changing in lattice parameter and lattice defect density in alkali halide crystals and finally change optical properties of crystal.

Keywords

Alkali Halide; Crystal Growth; Czochralski; Seed; Mixed Crystal; Etching; Color Center; Lattice Defect; X-Ray Diffraction; Absorbing Spectrum

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	V. H. Babu and U. V.Subba Rao, “Growth and Characterization of Alkali Halide Mixed Crystals,” Progress in Crystal Growth and Characterization, Vol. 8, No. 3, 1984, pp. 189-260. doi:10.1016/0146-3535(84)90002-9
[2]	D. B. Sirdeshmukh and K. Srinivas, “Physical Properties of Mixed Crystals of Al-kali Halides,” Journal of Materials Science, Vol. 21, No. 12, 1986, pp. 4117-4130. doi:10.1007/BF01106517
[3]	T. K. Swamy, K. G. Subhadra and D. B. Sirdeshmukh, “X-Ray Diffraction Studies of RbBr-RbI Mixed Crystals,” Physics and Astronomy, Vol. 43, No. 1, 1994, pp. 33-39. doi:10.1007/BF02847597
[4]	P. G. Krishna, K. G. Subhadra, T. K. Swamy and D. B. Sirdeshmukh, “Debye-Waller Factors and Debye Temperatures of Alkali Halide Mixed Crystals,” Pramana— Journal of Physics, Vol. 52, No. 5, 1999, pp. 503-509.
[5]	D. B. Sirdeshmukh, T. K. Swamy, P. G. Krishna and K. G. Subhadra, “Systematic Hardness Measurements on Mixed and Doped Crystals of Rubidium Halides,” Bulletin of Materials Science, Vol. 26, No. 2, 2003, pp. 261-265. doi:10.1007/BF02707801
[6]	X. S. Shajan, K. Sivaraman, C. Mahadevan and D. C. Sekharam, “Lattice Variation and Stability of NaCl-KCI Mixed Crystals Grown from Aqueous Solutions,” Crystal Research and Technology, Vol. 27, No. 4, 1992, pp. K79-K82.
[7]	S. K. Mohanlal and D. P. Padiyan, “X-Ray Studies on Quaternary System RbxK1–xBryCl1–y,” Crystal Research and Technology, Vol. 38, No. 6, 2003, pp. 494-498. doi:10.1002/crat.200310062
[8]	J. H. Schulman and W. D. Compton, “Color Centers in Solids,” Pergarmon Press, New York, 1963.
[9]	Jayaram, “Optics and Spectroscoply Part 1 Tm,” Tn Tbs, New Delhi, 1972.
[10]	W. B. Fowler, “Physics of Color Centers,” Academic Press, New York, 1968.
[11]	R. A. Kumari and R. Chandramani, “Thermoluminescence, Optical Absorption and ESR Studies in (KCl)1–x(KBr)x Mixed Alkali Halide Crystals Doped with Gold,” Radiation Measurements, Vol. 43, No. 2, 2008, pp. 278-282.
[12]	S. Perumal and C. K. Mahadevan, “Growth and Characterization of Multiphased Mixed Crystals of KCl, KBr and KI:1. Growth and X-Ray Diffraction Studies,” Physica B: Condensed Matter, Vol. 369, No. 1-4, 2005, pp. 89- 99.
[13]	K. Jayakumari and C. Mahadevan, “Growth and X-Ray Studies of (NaCl)x(KCl)y–x(KBr)1–y Single Crystals,” Journal of Physics and Chemistry of Solids, Vol. 66, No. 10, 2005, pp. 1705-1713. doi:10.1016/j.jpcs.2005.07.008
[14]	D. B. Sirdeshmukh, L. Sirdeshmukh and K. G. Subhadra, “Alkali Halides: A Handbook of Physical Properties,” Springer, Berlin, 2001.
[15]	H. Lipson and H. Steeple, “Interpretation of X-Ray Powder Diffraction Patterns,” Macmillan, New York, 1970.
[16]	B. E. Warren, “X-Ray Diffraction,” Addison Wesley, Boston, 1969.
[17]	S. R. Ghadekar and B. T. Deshmukh, “Dislocation Nucleation and Precipitation of Impurity in Calcium-Doped NaCl- KCl Crystals,” Physics Letters A, Vol. 95, No. 6, 1983, pp. 321-325.
[18]	K. Sangwal, “Etching of Crystals: Theory, Experiment, and Application,” North-Holland, Amsterdam, 1987.
[19]	B. T. Deshmukh, R. B. Pode and S. V. Moharil, “Anomalous Thermoluminescent Emission from NaCl:KCl Crystals,” Physics Review B, Vol. 25, No. 12, 1982, pp. 7025- 7027.
[20]	K. R. Ananda and R. Chandramani, “Evaluation of Lattice Parameter and Defect Related Studies of (KBr)x(NaBr)1–x Mixed Crystals Grown from Aqueous Solution,” Journal Physics A, Vol. 77, No. 3, 2003, pp. 219-224.
[21]	I. Y. Me-lik-Gaikazyan and E. K. Zavodskaya, “The Connection between F-Band Half-Widths and Defects in Solid Solutions of Alkali Halide Crystals,” Optics and Spectroscopy, Vol. 9, 1960, p. 268.