Growth and Characterization of Holmium Oxalate Heptahydrate Crystals

• 作者: Basharat Want Feroz Dar
• 来源期刊: 结晶过程及技术期刊(英文)
• 学科: 化学
• 关键词: HOLMIUM OXALATE Heptahydrate Single Rystals X-RAY DIFFRACTION THERMOGRAVIMETRIC Analysis
• 年，卷（期）: 2012,（4）
• 页码范围: 137-141
• 页数: 5页
• 分类号: O6

摘要

Single crystals of holmium oxalate heptahydrate are grown by gel diffusion method using organic agar gel as a medium of growth. The crystals grow in the agar gel with hexagonal morphology having well defined habit faces Powder X-ray diffraction results show that the crystals belong to monoclinic system bearing the space group P21/c with cell parameters;a = 12.197? , b = 11.714 , c = 6.479 , α = 90°, β = 120.12°, γ = 90°, V = 799.6? 3. Fourier transform Infrared spectrum of the crystals shows the presence of water and other associated functional groups. Thermogravimetric analysis support the presence of 7 H2O molecules associated with holmium oxalate crystal lattice. The thermal decomposition in the nitrogen atmosphere leads to the formation of holmium oxide as the final product.