We have fabricated various amount of Li 2 CO 3 doped (Ba,Sr)TiO 3 (BST) ceramics for LTCCs (Low Temperature Co-fired Ceramics) applications through the conventional sintering method. By introducing Li 2 CO 3 into BST ceramics, the sintering temperature was decreased from 1350°C to 900°C. In this study, we discussed the crystalline and structural properties of Li 2 CO 3 doped BST ceramics. By scanning X-ray diffraction analysis, we found that 1, 3, and 5 wt% Li 2 CO 3 doped (Ba,Sr)TiO 3 ceramics have perovskite structure without any pyrochlore phases. Frequency dependent dielectric properties were analyzed and discussed. Scanning Electron Microscopy (SEM) images depending on the sintering temperature and dopants were prepared and discussed. The crystalline and dielectric properties of Li 2 CO 3 doped (Ba,Sr)TiO 3 were discussed.
In this study, we fabricate 3 wt% Li2CO3 doped (Ba,Sr)TiO3 thick films on the Ag/Pd bottom electrode printed Al2O3 substrates for the LTCCs (low temperature co-fired ceramics) applications. From the X-ray diffraction analysis, 3 wt% Li2CO3 doped BST thick films on the Ag/Pd printed Al2O3 substrates, which sintered at 900℃, showed perovskite structure without any pyro phase. The dielectric properties of 3 wt% Li2CO3 doped BST thick films are measured from 1 kHz to 1 MHz. To investigate the electrical properties of 3 wt% Li2CO3 doped BST thick films, we employ the impedance spectroscopy.
BST ceramics with doping of 1, 3, and 5 wt.% ZnBO were prepared by the conventional mixed oxide method and sintered at 1100°. X-ray diffraction analyses were carried out to verify the structural properties. 1, 3, and 5 wt.% ZnBO doped BST ceramics were crystallized with weak tetragonal structure at 1100°C. The grain growth behavior and shapes were investigated by scanning electron microscopy images. The electrical properties of 1, 3, and 5 wt.% ZnBO doped BST ceramics were investigated by impedance spectroscopy at the different temperatures (350, 375, and 400°C). Impedance spectroscopy data presented in Nyquist plot show the existence of both grain and grain boundary effects in all specimens. 1, 3, and 5 wt.% ZnBO doped BST ceramics showed negative temperature coefficient of resistance (NTCR). Also, the capacitances and resistances of grains and grain boundaries for 1, 3, and 5 wt.% doped BST ceramics were simulated through equivalent circuit with the parallelly connected capacitors and resistors. The capacitance and resistance were decreased when temperature and ZnBO dopants were increased.
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