Influence of size on the dielectric properties of fine-grain BaTiO3 ceramics (2023)

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To produce a fine BaTiO microstructure3High density, high purity, stoichiometric and well distributed BaTiO ceramics.3Powder with an average grain size of 13 nm of cubic symmetry was prepared by a modified sol-gel method using hydroxide and alcoholate as precursors. The powders were hot pressed under vacuum at 1050-1150°C and an aniaxial pressure of about 30 MPa. For electrical measurements, a conductive silver paste was applied and bent at 600°C for 30 minutes. The ceramic density was measured

results and discussion

It is difficult to produce sufficiently dense ceramics with superfine grain size, because large deformations occur during the transition of the sample from cubic to tetragonal structure, which often lead to the collapse of the sediment. At the same time, the specific surface energy increases sharply with decreasing grain size and then leads to irregular growth with increasing sintering temperature. In order to obtain fine-grained samples with high density, many influencing factors must be thoroughly investigated,


The dielectric properties of barium titanate ceramics were measured by changing the grain size between 280 nm and 1.8 μm. Observations confirmed that the dielectric properties depend on grain size. A diffuse phase transition was observed when the grain size was reduced to 280 nm. In the 280 nm sample, high dielectric constant values ​​and low dissipation factors were observed that cannot be explained by previous theories. A part of the grains showing a tetragonal structure is considered to be the

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