90 research outputs found
Fabrication of 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 ceramics by conventional solid state reaction method
The possibility to obtain of ceramic solid solution between barium titanate and lead magnesium niobate by two-step sintering technique through conventional solid-state reaction method has been investigated. In the first step MgNb 2O6 has been synthesized. In the second step 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 has been obtained using MgNb2O6, PbO and BaTiO 3. The two-step sintering technique is effective for the synthesized of 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 ceramics. Single-phase (pyrochlore-free) ceramics with perovskite phase were obtained
Effect of Sb and MnO2-Doping on Phase Transitions, Crystal Structure, Thermal, Dielectric, Ferroelectric and Piezoelectric Properties of Na0.5K0.5NbO3 Ceramics
Lead-free ceramics of Na0.5K0.5Nb1-xSbxO3 (NKNS) and Na0.5K0.5Nb1-xSbxO3 + 0.5 mol%MnO2 (NKNS + 0.5 mol%MnO2)
(0 < x < 0.06) ceramics were prepared by a conventional solid-state hot pressing method. The ceramics possess a single-phase
perovskite structure with orthorhombic symmetry. Microstructural examination revealed that Mn doping of NKNS leads to improvement
of densification. The cubic-tetragonal and tetragonal-orthorhombic phase transitions of NKNS shifted to higher and
lower temperature, respectively after introduction of Mn ion. Besides, ferroelectric and piezoelectric properties were improved.
The results were discussed in term of difference in both ionic size and electronegativity of Nb5+ and Sb5+ and improvement of
densification after Mn ion doping
The effect of a.c. and d.c. electric field on the dielectric properties of Na₀.₅Bi₀.₅TiO₃ ceramic
The dielectric properties were studied for Na₀.₅Bi₀.₅TiO₃ ceramic as a function of a.c. electric field, d.c. electric field, frequency, and temperature. The
increasing strength of a.c. electric field shifts the electric permittivity function towards lower temperatures. However, d.c. electric field reduces electric permittivity and slightly suppresses the frequency dispersion. These
effects can be connected with the existence in NBT of polar regions.Досліджено діелектричні властивості кераміки Na₀.₅Bi₀.₅TiO₃ як функції змінного і постійного електричного поля та температури. Збільшення змінного електричного поля зсуває діелектричну проникність
в область нижчих температур, а постійне електричне поле зменшує
проникність і дещо придушує її частотну дисперсію. Ці ефекти можуть бути пов’язані з існуванням в НВТ полярних областей
THE EFFECT OF A.C. AND D.C. ELECTRIC FIELD ON THE DIELECTRIC PROPERTIES OF Na_{0.5}Bi_{0.5}TiO_3 CERAMIC
The dielectric properties were studied for Na₀.₅Bi₀.₅TiO₃ ceramic as a function of a.c. electric field, d.c. electric field, frequency, and temperature. The
increasing strength of a.c. electric field shifts the electric permittivity function towards lower temperatures. However, d.c. electric field reduces electric permittivity and slightly suppresses the frequency dispersion. These
effects can be connected with the existence in NBT of polar regions.Досліджено діелектричні властивості кераміки Na₀.₅Bi₀.₅TiO₃ як функції змінного і постійного електричного поля та температури. Збільшення змінного електричного поля зсуває діелектричну проникність
в область нижчих температур, а постійне електричне поле зменшує
проникність і дещо придушує її частотну дисперсію. Ці ефекти можуть бути пов’язані з існуванням в НВТ полярних областей
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