Growth and Characterisation of Gel-grown Lead(II)Chloride and Lead(II)Bromide Single Crystals

✍ Scribed by Prof. P. Sagayaraj; S. Sivanesan; R. Gobinathan

• Publisher: John Wiley and Sons
• Year: 1995
• Tongue: English
• Weight: 432 KB
• Volume: 30
• Category: Article
• ISSN: 0232-1300
• DOI: 10.1002/crat.2170300304

✦ Synopsis

Growth and Characterisation of Gel-grown Lead (1I)Chloride and Lead(I1)Bromide Single Crystals

Single crystals of pure and doped lead(I1)chloride and lead(I1)bromide were grown by gel technique employing a modified two-stage chemical reaction. Methods to minimise the predomination of needle morphology during the growth of these crystals have been investigated and the results are discussed. The grown crystals were characterised by optical transmission spectrum. Undoped and monovalent cation (K', Na+, Cu', Ag' and Hg') doped crystals of PbCI, and PbBr, were subjected to d.c. electrical conductivity studies. Using the log oT versus Tplot, the activation energies for the migration of anion vacancies in lead(I1)halides are calculated. They are found to be less for the doped crystals than those of undoped ones.