P. Sagayaraj et al., GROWTH AND CHARACTERIZATION OF GEL-GROWN LEAD(II)CHLORIDE AND LEAD(II)BROMIDE SINGLE-CRYSTALS, Crystal research and technology, 30(3), 1995, pp. 299-306
Single crystals of pure and doped lead(II)chloride and lead(II)bromide
were grown by gel technique employing a modified two-stage chemical r
eaction. Methods to minimise the predomination of needle morphology du
ring the growth of these crystals have been investigated and the resul
ts are discussed. The grown crystals were characterised by optical tra
nsmission spectrum. Undoped and monovalent cation (K+, Na+, Cu+, Ag+ a
nd Hg+) doped crystals of PbCl2 and PbBr2 were subjected to d.c. elect
rical conductivity studies. Using the log sigma T versus T-1 plot, the
activation energies for the migration of anion vacancies in lead(II)h
alides are calculated. They are found to be less for the doped crystal
s than those of undoped ones.