METHOD FOR PRODUCING CERAMIC MATERIAL BASED ON BISMUTH-ZINC-NIOBIUM OXIDES Russian patent published in 2023 - IPC C04B35/495 C04B35/453 C04B35/645 

FIELD: dielectric materials.

SUBSTANCE: technology for manufacturing dielectric ceramic material based on bismuth-zinc-niobium oxides Bi₂O₃–ZnO–Nb₂O₅ (BZN) and can be used in production of multilayer thermostable ceramic capacitors with internal electrodes. A synthesized ceramic material with the chemical formula (Bi_1.5Zn_0.5)(Zn_0.5Nb_1.5)O₇ with a pyrochlore structure is ground in a vibrating mill and the powder is placed in a cylindrical graphite matrix of a spark plasma sintering press, where the synthesized powder is simultaneously moulded and sintered in vacuum at uniaxial pressure P=3.5⋅10⁶N/m² , at a temperature of 930–950°C with isothermal holding for 30-60 s and subsequent cooling of the resulting workpiece in the matrix to room temperature.

EFFECT: technical result of the invention is production of dielectric ceramic samples of BZN with a dense and homogeneous coarse-crystalline microstructure and a small width of grain boundaries, increasing the values of the relative dielectric constant (ε/ε₀=170-180) while maintaining low values of the dielectric loss tangent at a frequency of 1 MHz tgδ⋅10⁴ less than 1%, temperature coefficient TKE=-(251–416)⋅10^-6deg ^-1.

5 cl, 2 dwg, 2 tbl