Zirconia nucleating agent on microstructural and electrical properties of a CaMgSi{sub 2}O{sub 6} diopside glass–ceramic for microwave dielectrics

Journal Article · Mon Oct 15 04:00:00 EDT 2012 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2012.04.046· OSTI ID:22215510

Feng, Kuei-Chih ^[1]; Chou, Chen-Chia ^[1]; Chu, Li-Wen ^[2]; Chen, Haydn ^[3]

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1. Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan, ROC (China)
2. Walsin Technology Corporation, Kaohsiung 806, Taiwan, ROC (China)
3. 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, Journal Name: Materials Research Bulletin Journal Issue: 10 Vol. 47; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTALLIZATION
DIELECTRIC MATERIALS
DIELECTRIC PROPERTIES
DIOPSIDE
HEAT TREATMENTS
MICROSTRUCTURE
QUALITY FACTOR
SOLID SOLUTIONS
TRANSMISSION ELECTRON MICROSCOPY
ZIRCONIUM OXIDES