Ahmad Taha, Iftetan (1999) Correlation of Some Dielectric Properties with Processing and Microstructure in Mg-Sn-O System. Masters thesis, Universiti Pertanian Malaysia.
The alkaline-earth stannates having the general chemical formula MSn03 (M = Ca, Sr and Ba), have been projected as potential electronic ceramics (thermally stable capacitors, humidity sensor, carbon dioxide sensor, etc.). Even though magnesium is a member of the metal group to which Ca, Sr and Ba belong, no reliable technical information on the compounds in the pseudo-binary MgO-SnO₂ system appears to exist in the published literature. In view of the information gaps in the reported research, vigorous and systematic investigation has been carried out on the MgO-SnO₂ system. The MgO-SnO₂ system has been thoroughly studied with respect to synthesis, processing and characterisation - physical, microstructural and electrical. Two different synthesis routes have been adopted. These routes are solid-state and self-he atsustained. For each route two mixtures of different molar ratio viz., 2:1 and 1:1 have been used. In 2:1 molar ratio mixtures MgzSnO₄ has been formed as a single phase upon calcination of starting materials at 1200°C/24 h in both solid-state and self-heatsustained techniques with one or two impurity peaks at 1200°C/ 24 h. In 1:1 molar ratio, the reaction product consisted of a two-phase mixture of Mg₂SnO₄ and SnO₂. Evaluation of microstructure that is intimately related to the envisaged properties in the ceramics has been closely and systematically followed as a function of sintering at different temperatures of (1200- 16000°C) and soak - time (2-48 h). A thorough analysis of the as measured electrical data showed that the material possessed a very weak temperature dependence of capacitance (TCC) and dielectric constant (TCK) in the range 27-300°c over several decades of frequency domain. It was found that TCC value varied between (-200 to +195) ppm IK thus holding the promise to its usage as a thermally stable capacitor component in high-speed electronic devices. The average dielectric constant was found to be in the range 10-18, thus identifying this material as a low dielectric constant system as well.
|Item Type:||Thesis (Masters)|
|Subject:||Liquid dielectrics - Case studies|
|Subject:||Linear free energy relationship|
|Chairman Supervisor:||Abdul-Majeed Azad, PhD, Mansor Hashim, PhD|
|Call Number:||FSAS 1999 15|
|Faculty or Institute:||Faculty of Science and Environmental Studies|
|Deposited By:||Laila Azwa Ramli|
|Deposited On:||08 Feb 2011 02:13|
|Last Modified:||25 Sep 2013 07:38|
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