Effect of Er{sub 2}O{sub 3} dopant on electrical and optical properties of potassium sodium niobate silicate glass-ceramics

• Published in: Materials research bulletin Vol. 69
• Main Authors: Yongsiri, Ploypailin, Sirisoonthorn, Somnuk, Pengpat, Kamonpan, Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200
• Format: Journal Article
• Language: English
• Published: United States 15.09.2015
• Subjects: CERAMICS; CRYSTALS; DIELECTRIC MATERIALS; DOPED MATERIALS; ERBIUM OXIDES; GLASS; HEAT TREATMENTS; MATERIALS SCIENCE; NIOBATES; OPTICAL PROPERTIES; PERMITTIVITY; POTASSIUM COMPOUNDS; SCANNING ELECTRON MICROSCOPY; SILICATES; SILICON OXIDES; SODIUM COMPOUNDS; SOLID SOLUTIONS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/J.MATERRESBULL.2015.02.004

Highlights: • The KNN–SiO{sub 2} doped Er{sub 2}O{sub 3} glass-ceramics was prepared by incorporation method. • High dielectric constant (458.41 at 100 kHz) and low loss (0.0005) could be obtained. • TEM and SEM confirmed the existence of KNN crystals embedded in glass matrix. • The Er{sub 2}O{sub 3} dopant causes insignificant effect on modifying E{sub g} value. - Abstract: In this study, transparent glass-ceramics from potassium sodium niobate (KNN)-silicate glass system doped with erbium oxide (Er{sub 2}O{sub 3}) were successfully prepared by incorporation method. KNN was added in glass batches as heterogeneous nucleating agent. The KNN powder was mixed with SiO{sub 2} and Er{sub 2}O{sub 3} dopant with KNN and Er{sub 2}O{sub 3} content varied between 70–80 and 0.5–1.0 mol%, respectively. Each batch was subsequently melted at 1300 °C for 15 min in a platinum crucible using an electric furnace. The quenched glasses were then subjected to heat treatment at various temperatures for 4 h. XRD results showed that the prepared glass ceramics contained crystals of KNN solid solution. In contrary, dielectric constant (ϵ{sub r}) and dielectric loss (tan δ) were found to increase with increasing heat treatment temperature. Additionally, optical properties such as absorbance and energy band gap have been investigated.