中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 20 No. 8 August 2010 |
glass-ceramic nanocomposites of (Pb,Sr)Nb2O6-NaNbO3-SiO2
（Advanced Electronic Materials Institute, General Research Institute for Nonferrous Metals, Beijing 100088, China）
Abstract:The structure and dielectric properties of (Pb,Sr)Nb2O6-NaNbO3-SiO2 glass-ceramics with different Pb and Sr contents were investigated. The XRD pattern of glass-ceramics without Sr substitution is different from that with Sr substitution, which indicates the existence of orthorhombic phase in the latter ones. TEM bright field observation shows nanosized microstructures, while for samples with Sr, typical eutectic microstructure with separated crystallized bands is found in the glass matrix. Dielectric properties measurement of the samples indicates an obvious improvement of dielectric constant, dielectric loss, DC field and temperature dependence of dielectric constant when the molar ratio of Sr to Pb is 4׃6.
Key words: dielectric properties; nanocomposite; (Pb, Sr)Nb2O6; NaNbO3; glass-ceramics
