Thermal behavior and transformation kinetics of titanium dioxide nanocrystallites prepared by coupling agents

• Published in: Journal of alloys and compounds Vol. 490; no. 1; pp. 576 - 581
• Main Authors: Chen, W.C., Wang, Y.T., Shih, C.J.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 04.02.2010; Elsevier
• Subjects: Chemical synthesis methods; Coupling agents; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Methods of nanofabrication; Nanocrystalline materials; Nanocrystallites; Nanoscale materials and structures: fabrication and characterization; Physics; Transformation; Nanocrystallites; Coupling agents; Transformation; Densification; Thermal decomposition; Crystallization; Differential thermal analysis; XRD; Cocombustion; Transmission electron microscopy; Sintering; Oxidation; Kinetics; Microstructure; Titanium oxide; Activation energy; Nanocrystal; Nanomaterial synthesis
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2009.10.087

Coupling agents have been widely used to retard the sintering of silver paste and minimize co-firing defects due to densification mismatch between silver and dielectrics. The thermal-decomposition and crystallization behavior of the coupling agent is a subject of great concern. To elucidate what is responsible for the oxidation, Ti organometallic compounds were calcined at different temperatures (350, 400, 500, 600 °C) for 2 h and the crystallization behavior was determined by X-ray diffraction (XRD). The activation energy for crystallization of coupling agents was studied by using isothermal methods. According to the quantitative XRD method, the values calculated by the Johnson–Mehi–Avrami equation are 134.9 kJ mol −1. The growth morphology parameters are 1.061, 0.915, 1.016 respectively. Combining the results of DTA, XRD and TEM, it is found that formation of nanocrystallized titania accompanies the combustion of organometallic compounds.