Open AccessCrystallization and Dielectric Properties of BaO-SrO-PbO-TiO2-Nb2O5-SiO2 Glass-Ceramic Composites with La2O3 Addition
Author(s) -
Qingmeng Zhang,
Junyou Chen,
Min Zhou,
Yanyun Zhao
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2085/1/012036
Subject(s) - materials science , dielectric , pyrochlore , microstructure , crystallization , ceramic , grain size , mineralogy , analytical chemistry (journal) , annealing (glass) , dielectric loss , composite material , phase (matter) , chemical engineering , chemistry , optoelectronics , organic chemistry , chromatography , engineering
Glass-ceramic composite samples with different La 2 O 3 content were prepared via melt-quenching followed by controlled crystallization. X-ray diffraction(XRD) analysis reveals that when the addition amount of La 2 O 3 in the glass sample is less than 1mol%, two phases of perovskite structure and tungsten-bronze structure are formed after annealing at 1000°C for 3h. When the addition amount of La 2 O 3 in the glass sample is increased to 2mol%, a new phase of pyrochlore structure is formed. Moreover, the addition of La 2 O 3 causes the change in the lattice parameters of the glass-ceramic crystal phase. The microstructure observed that the ceramic phase grain size is in the nanometer level. The shape of some grains becomes an elongated structure when the La 2 O 3 content in the sample increases to 2 mol%, and the grain size is increased significantly. The dielectric constant of the BaO-SrO-PbO-TiO 2 -Nb 2 O 5 -SiO 2 glass-ceramic system is decreased with the increase of La 2 O 3 addition, and the dielectric loss of the sample is decreased to the range of 0.003-0.008. The electric field stability of the dielectric constant was significantly improved with the addition of La 2 O 3 , indicating that adding a certain proportion of La 2 O 3 to the BaO-SrO-PbO-TiO 2 -Nb 2 O 5 -SiO 2 glass-ceramic system can effectively improve the dielectric properties, and it has a promising application as a dielectric material.