Zirconia nucleating agent on microstructural and electrical properties of a CaMgSi{sub 2}O{sub 6} diopside glass–ceramic for microwave dielectrics
- Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC (China)
- Walsin Technology Corporation, Kaohsiung 806, Taiwan, ROC (China)
- Department of Physics, Tunghai University, Taichung 407, Taiwan, ROC (China)
Addition of different amount of zirconia (ZrO{sub 2}) nucleating agent into MgO–CaO–SiO{sub 2} system to enhance the quality factor (Q × f) of CaMgSi{sub 2}O{sub 6} diopside glass–ceramic for low sintering temperature process (from 850 to 950 °C) was carried out in this work. The microstructures, microwave dielectric properties and nucleating/growth mechanism of m-ZrO{sub 2} added CaMgSi{sub 2}O{sub 6} system were analyzed using transmission electron microscopy (TEM) and electrical property measurements. Experimental results demonstrate that a solid solution of an amorphous phase MgO–CaO–SiO{sub 2} and ZrO{sub 2} forms after melted at 1500 °C. The t-ZrO{sub 2} appears in the amorphous matrix first and then crystalline CaMgSi{sub 2}O{sub 6} particle grows up at around the boundary of t-ZrO{sub 2} after thermal treatment at 850 °C due to heterogeneous nucleating. Formation of t-ZrO{sub 2} is attributed to diffusion of Ca{sup 2+} to stabilize the m-ZrO{sub 2}. The quality factor of CaMgSi{sub 2}O{sub 6} was significantly enhanced by adding 3 wt.% m-ZrO{sub 2}, indicating that the ZrO{sub 2} nucleating agent could enhance crystallization and therefore increase the quality factor.
- OSTI ID:
- 22215510
- Journal Information:
- Materials Research Bulletin, Vol. 47, Issue 10; Conference: IFFM2011: 2011 international forum on functional materials, Jeju Island (Korea, Republic of), 28-31 Jul 2011, AFM-2: 2. special symposium on advances in functional materials, Jeju Island (Korea, Republic of), 28-31 Jul 2011; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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