Control of Microwave Dielectric Properties in 0.42ZnNb₂O_(6)-0.58TiO₂ Ceramics by the Quantitative Analysis of Phase Transition

다국어 초록 (Multilingual Abstract)

Phase constitutions of ZnNb₂O_(6)-TiO₂ mixture ceramics were significantly changed according to the sintering temperature. Phase transition procedures and their effect on the microwave dielectric properties of 0.42ZnNb₂O_(6)- 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 0.42ZnNb₂O_(6)-0.58TiO₂ were interpreted as the association of two distinct steps: the columbite and rutile to ixiolite transition present at lower temperatures (900~950 ℃) and the ixiolite to rutile transition at higher temperatures (1150~1300 ℃). These transitions caused considerable variation of microwave dielectric properties. Importantly, tf was modified to around 0 ppm/℃ in two sintering conditions (at 925 ℃ for 2 hr and at 1300 ℃ for 2 hr), by the control of phase constitution.

목차 (Table of Contents)

• 1. INTRODUCTION
• 2. EXPERIMENTAL PROCEDURES
• 3. RESULTS AND DISCUSSION
• 3.1. Quantitative analysis of phase fraction in mixture system using X-ray diffraction
• 3.2. Phase constitutional change in low temperature region
• 3.3. Phase constitutional change in high temperature region
• 3.4. Microwave dielectric properties
• 4. CONCLUSIONS
• ACKNOWLEDGMENT
• REFERENCES