X-Ray Studies and The Activation Energy for The Lattice Destruction of Tale

• Main Authors: A.S. El-Hiti, M.S. Farag
• Format: Article
• Language: Arabic
• Published: King Saud University 1982-01-01
• Series: Journal of Islamic Studies
• Subjects: Chemical analysis; X-Ray
• Online Access: http://jes.ksu.edu.sa/sites/jes.ksu.edu.sa/files/0074.pdf

Egyptian talc was subjected to different methods of analysis, Chemical analysis, differential thermal analysis, thermo-balance methods and k-ray analysis were used in this study. x-ray qualitative and quantitative analyses were carried out to identify the raw mineral. These methods showed that the raw talc is a mixture of 93.7% talc and 6.3% chrysotile. A discussion was made in terms of the hypothetical formula and the chemical analysis. The activation energy for the lattice destruction of talc was studied. The break down of the reaction was described mathematically. The order of reaction, the frequency and the activation energy were calculated and were found to be 0.989, 8933 x 106 and 58.21 cal. / mot. respectively. Talc is a layer structure mineral, I, . This is composed of silica layers and brucite layers. The former consists of Si-0 tetrahedra connected at three corners in the same plane so that a two dimensional network of the hexagonal rings is obtained. The brucite layers consists of hydroxyl ions in tow planes, above and blew a plane of magnesium ions which are octahedrally coordinated by the hydroxyls. The structures of talc can be generated by simple combinations of these two units.