Crystallization in Na2O–Nb2O5–Al2O3–SiO2 glass–ceramics system with partial replacement of SnO2 for Al2O3
- Resource Type
- Article
- Authors
- Kongputhon, Pornpis; Niyompan, Anuson; Tipakontitikul, Rungnapa
- Source
- Journal of Crystal Growth. Jan2013, Vol. 362, p116-120. 5p.
- Subject
- *CRYSTALLIZATION
*METALLIC oxides
*GLASS-ceramics
*FERROELECTRIC materials
*METAL quenching
*TEMPERATURE effect
*THERMAL analysis
- Language
- ISSN
- 0022-0248
Abstract: Replacement of SnO2 for Al2O3 content was performed in ferroelectric glass–ceramics of Na2O–Nb2O5–Al2O3–SiO2 system and its effect on crystallization process and the associated properties were investigated. Conventional melt quenching method was employed for parent glass production. Their derived glass–ceramics samples were then produced via heat treatment (HT) process at temperature in the range 700–950°C for 3h which were guided by differential thermal analysis (DTA). Crystalline phases were indentified using X-ray diffraction (XRD) which NaNbO3 and NaNb3O8 phases are found. Scanning electron microscopy (SEM) was used to image the crystalline phase morphologies. The results of calculated crystalline sizes from FWHM of the XRD strongest reflection peak show that sodium niobate crystals are in nano-scale. The results of dielectric measurements at room temperature up to 600°C revealed the dominant contribution of NaNbO3 phase. [Copyright &y& Elsevier]