Pyro and Kinetic Studies of Barium Oxalate Crystals Grown in Agar Gel

• 作者: Kishor B. Saraf Navinchandra G. Shimpi Navneet R. Shah Paresh V. Dalal
• 来源期刊: 结晶过程及技术期刊(英文)
• 学科: 化学
• 关键词: BARIUM OXALATE Thermo-Gravimetric Analysis KINETIC Studies THERMODYNAMIC Parameters
• 年，卷（期）: 2012,（4）
• 页码范围: 156-160
• 页数: 5页
• 分类号: O6

摘要

Single crystals of barium oxalate have been grown using gel method at ambient temperature. Thermal characteristics and kinetic parameters of barium oxalate crystals were determined by thermo-gravimetric (TG) analysis under non-isothermal heating conditions. The pyrolysis experiments were performed with increasing temperature up-to 600℃ at heating rate of 5℃, 7℃ and 10℃ in nitrogen gas atmosphere. The pyrolysis curve showed that loss of mass took place mainly in the range of 220℃ - 400℃. At higher temperature there was a significant mass loss due to decomposition of oxalates. Ozawa and Coats & Redfern methods were used to determine the apparent activation energies of material degradation. The apparent activation energies for barium oxalate crystals were obtained 187.42 KJ·mol-1 and 185.4 KJ·mol-1 for the respective methods.