Phase constitutions of ZnNb2O6-TiO2 mixture ceramics were significantly changed according to the sintering temperature. Phase transition procedures and their effect on the microwave dielectric properties of 0.42ZnNb2O6-0.58TiO2 were investigated using X-ray powder diffraction and a network analyzer. The fractions of the phases composing the mixture were calculated by measuring integral intensities of each reflection. The structural transitions in 0.42ZnNb2O6-0.58TiO2 were interpreted as the association of two distinct steps: the columbite and rutile to ixiolite transition present at lower temperatures (900∼950 °C) and the ixiolite to mille transition at higher temperatures (1150∼1300 °C). These transitions caused considerable variation of microwave dielectric properties. Importantly, τf was modified to around 0 ppm/°C in two sintering conditions (at 925 °C for 2 hr and at 1300 °C for 2 hr), by the control of phase constitution.
|Number of pages
|Metals and Materials International
|Published - 2002 Dec
Bibliographical noteFunding Information:
This work was supported by the Ministry of Science and Technology of Korea (“Support Project of National Research Program <2001>” supervised by KISTEP).
- Microwave dielectric properties
- Phase transition
- Quantitative analysis
ASJC Scopus subject areas
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry