1. ASTM diffraction data file card. No. 12-688, 10-434, 5-0492
2. Biswas S, Pramanik P and Basu P K 1986Mater. Letts 4 81
3. Dona J M and Herrero J 1992This Journal 139 2810
4. Kale S S, Jahav U S and Lokhande C D 1996Indian J. Pure & Appl. Phys. 34 324
5. Kaur I, Pandya D K and Chopra K L 1980This Journal 127 943