Investigation low-temperature densification and dielectric properties of glass/Al2O3/nano-TiO2 ceramics for microwave applications
Journal of the Australian Ceramic Society, vol.61, no.2, pp.711-718, 2025 (SCI-Expanded, Scopus)
- Publication Type: Article / Article
- Volume: 61 Issue: 2
- Publication Date: 2025
- Doi Number: 10.1007/s41779-024-01136-1
- Journal Name: Journal of the Australian Ceramic Society
- Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Aerospace Database, Communication Abstracts, Metadex, Civil Engineering Abstracts
- Page Numbers: pp.711-718
- Keywords: Dielectric properties, Glass/ceramic, Microwave application, Nano TiO2, Sintering
- Ankara Yıldırım Beyazıt University Affiliated: Yes
Abstract
A commercial SiO2-Al2O3-CaO-based commercial glass, Al2O3, and nano-TiO2 were used as initial materials. Glass/Al2O3/TiO2 samples were fabricated using the uniaxial dry pressing method, using C55 with 15 wt% TiO2, 23 wt% TiO2 and 36 wt% TiO2. The optimum bulk density temperature for the C55 was 800 ˚C, for the C55-15 T was 900 ˚C, for the C55-23 T was 900 ˚C, for the C55-36 T was 1000 ˚C. TiO2 neither chemically reacted with the other phases nor decomposed with temperature which was critical to increasing the dielectric constant. The C55-36 T sample was highlighted for its low sintering temperature of 1000 °C, high dielectric constant values (18.92 at 5 MHz, 17.40 at 1 GHz, and 17.03 at 10 GHz), low dielectric loss (0.0058 at 5 MHz, 0.0063 at 1 GHz, and 0.0075 at 10 GHz), as well as a near-zero temperature coefficient (1.7 ppm/°C) along with high mechanical properties.