Properties Of BCZT Ceramics Research Articles

Effects of MnO2 doping on the electrical properties of BCZT ceramics prepared by seed-induced method

The effects of MnO2 doping on the electrical properties of Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCZT) ceramics prepared by adding 1.0 mol% BCZT seed were studied Results were found that the ceramics showed pure perovskite phase phase for all samples. Density and grain size values were in the range of 5.45–5.57 g/cm3 and 6.79–9.85 μm, respectively. The highest values of εr and Pr measured at room temperatures were 3900 and 8.22 μC/cm2, respectively which were obtained for the sample of 1.0 mol% MnO2. Tan δ of all ceramic samples was lower than 0.02. In addition, d33 and g33 values were changed with MnO2 content.

Effect of Sintering Method on the Microstructure and Dielectric Properties of Lead-Free BCZT Ceramics

Lead-free ceramic powders based on Ba0.85Ca0.15Zr0.1Ti0.9O3 (BCZT) were successfully fabricated by the conventional solid-state reaction method. Two kinds of sintering methods: zero-time sintering (ZTS) and conventional sintering (CS) were applied to obtain BCZT ceramics. The microstructure and dielectric properties of BCZT ceramics sintered from the ZTS and the CS method were systematically studied. It was found that the coarse-grained samples with grain sizes ~ 19-21 μm were obtained from the ZTS and the CS method. The CS method with a long time of dwelling was helpful for improving the dielectric properties of lead-free BCZT ceramics. The maximum dielectric constant of 9926 and low dielectric loss of 0.0108 were obtained at CS with 8h.

Influence of CaZrO3 Nanocrystals on Phase Structure, Microstructure and Electrical Properties of BCZT Ceramics Prepared by Seed-Induced Method

Influence of CaZrO₃ Nanocrystals on Phase Structure, Microstructure and Electrical Properties of BCZT Ceramics Prepared by Seed-Induced Method

Comparative study of properties of BCZT ceramics prepared from conventional and sol-gel auto combustion powders

ABSTRACTThis work studies properties of Ba0.85Ca0.15Ti0.9Zr0.1O3 (BCZT) ceramics prepared from the BCZT powders synthesized by conventional mixed oxide (so called M) and sol-gel auto combustion (so called A) methods. The M and A powders were calcined at 1200 and 900°C, respectively. Different amounts (0, 50 and 100 wt%) of A powder were added into M powder then sintered at 1450°C for 2 h. Grain size and dielectric constant (ϵr) tended to decrease with A powder content. The highest ϵr value of 5342 but slimmest was observed in the ceramic with 100 wt% A powder addition.

Phase Structure, Microstructure and Electrical Properties of BCZT Ceramics Prepared by Seed-Induced Method

The effect of particle sizes of CaZrO3 (CZ) nanocrystal on the phase structure, microstructure and electrical properties of Ba0.85Ca0.15Zr0.10Ti0.90O3 (BCZT) was studied. The CaCO3 and ZrO2 were used as starting materials for CaZrO3 (CZ) seeds synthesized by the molten-salt method. The results were found that the CZ powder has a pure perovskite with the particle size about 370 to 460 nm. Then the CZ nanocrystals were mixed with the metal oxides BaCO3, CaCO3, ZrO2 and TiO2 by mixed oxide method. The phase structure, microstructure and electrical properties of BCZT ceramic were investigated as a function of particle size and concentration of CZ. The results indicated that all samples showed pure perovskite phase. The highest values of density, grain size, dielectric constant (εr) and piezoelectric coefficient (d33) were 5.50 g/cm3, 10.95 μm, 2992 and 446 pC/N, respectively which obtained at the CZ seed size 459 nm.

Effect of Zn2+ and Nb5+ Co-Doping on Electrical Properties of BCZT Ceramics by the Seed-Induced Method

The effects of Zn2+ and Nb5+ co-doping (x mol%ZN) on the electrical properties of lead-free Ba0.90Ca0.10Zr0.10Ti0.90O3-Seed ceramic systems, where x = 0.0–1.0 mol% have been studied. The ceramics were prepared using the solid state reaction technique. The phase of the samples showed pure perovskite structure. The density values of the ceramics were in the range of 4.86–5.78 g/cm3. The maximum dielectric constant was 40893 for 0.8 mol% ZN. The highest values of Pr ∼ 5.85 μC/cm2, d33 ∼ 381 pC/N and kp ∼ 38% were obtained for the sample of 0.4 mol% ZN.