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Crystal Research and Technology |
Cryst. Res. Technol. 40,
752 (2005) - Abstract -
Crystal growth and characterization of PbI2-AgI binary system
S. Pokhrel, A. Dhakshinamoorthy*, R. Sundaram*, and K. S. Nagaraja*
Department of Chemistry, St. Xavier’s Campus, Kathmandu, Nepal
*Department of Chemistry, Loyola College Chennai 600 034, India
| Keywords | AgI- PbI2, crystal growth, TG/DTA, electrical conductivity |
| PACS | 61.10.Nz, 67.80.Gb, 68.37.Ef, 71.20.Lp |
| DOI | 10.1002/crat.200410424 |
The crystals of the binary system PbI2-AgI (PIAI) were obtained by heating the mixture of individual PbI2 (PI) and AgI (AI) placed at 30° angle in the horizontal tubular furnace of variable temperature zone. The crystals were characterized by powder XRD, TG/DTA, FT-IR and SEM. The 3.37% weight loss in the sample after heating at 853 K is due to the presence of water molecules absorbed (3446 cm-1) by the crystals during sintering and cooling process. The cell parameters of the crystal were determined using the powder X-ray data. The PbI2-AgI crystallizes in monoclinic system a = 10.799 (±0.009), b = 7.492 (±0.004), c = 6.929(±0.004) Å and α = 90°, β = 108.04(±0.073) γ = 90°, V = 533.18 Å3. The electrical conductivity measurements of the crystals showed a sudden change in the current value at the temperature range 385 – 393 K. The activation energy before and after the drift was found to be 0.49 and 0.35 eV respectively.
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