A study on the interfacial reaction and dielectric properties of Ba-0.88(Nd1.40Bi0.42La0.30)Ti4O12/alkali-borosilicate glass composites

作者：Lin Kuan Hong^*; Liao Chang Lun; Lin Shun Tian

来源：Ceramics International, 2010, 36(8): 2365-2374.

DOI：10.1016/j.ceramint.2010.07.021

• Sintering
• Composites
• Microstructure-final
• Dielectric properties

This study investigated the effects of sintering parameters and the addition of alkali-borosilicate glass into the Ba-0.88(Nd1.40Bi0.42La0.30)Ti4O12 B(NBL)T ceramic. The microstructure evolution, ionic exchange phenomenon at phase interfaces and the dielectric properties variation of composites were examined by XRD, EPMA, TEM, RF impedance analyzer and network analyzer, respectively. XRD patterns revealed that interactions between B(NBL)T ceramic and glass during sintering could have caused the change in the preferred orientation as well as the shifting of the crystals' diffraction angles. EPMA mapping showed that the concentrations of Ba, and Bi decreased along the edge of the B(NBL)T ceramic that is closest to the glass phase, while the opposite trend was seen for Na and Ca. TEM and EDS analyses confirm that an ionic exchange took place during sintering with the glass phase wetting the B(NBL)T ceramic and was responsible for the change in the crystal plane and the variation in lattice parameters. The ionic exchange that occurred between the B(NBL)T ceramic and the glass phase resulted in a decrease in the electrical resistivity of the glass phase, which in turn reduced the dielectric loss.

• 出版日期2010-12