Dielectric Properties of Lead‐Magnesium Niobate Ceramics

Swartz, S. L.; Shrout, Thomas R.; Schulze, Walter A.

doi:10.1111/j.1151-2916.1984.tb19528.x

Cited by 525 publications

(178 citation statements)

References 8 publications

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“…The relaxor ceramic Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) exhibits high dielectric constant and electrostrictive characteristics, that make this material so useful for present and future electronic and microelectromechanical applications [1][2][3][4]. The central problem in manufacturing PMN-based single-phase ceramics is the strong inclination of this material to form detrimental secondary pyrochlore (Py) phases.…”

Section: Introductionmentioning

confidence: 99%

Effect of PbO excess on the formation of lead magnesium niobate perovskite by the columbite method

Cavalheiro

Barrionuevo

Bruno

et al. 2004

Materials Chemistry and Physics

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The effect of lead excess on the pyrochlore-type formation in Pb(Mg 1/3 Nb 2/3 )O 3 (PMN) powders has been investigated. The polymeric precursor method was used in the synthesis of the columbite in association to the partial oxalate method to synthesize the PMN powder samples. Structure refinement of the columbite precursor and PMN powders was carried out using the Rietveld method. The quantitative phase analysis showed that the amount of perovskite phase is not affected by PbO excess, but a great excess drives the pyrochlore-type formation so that 3 wt.% of PbO causes the predominance of Mg-containing pyrochlore phase. Using the refined data obtained from the Rietveld refinement, the compositional fluctuation in the perovskite phase was calculated from Nb/Mg ratio values and Pb occupation factor. Mg inclusion occurs concomitant with Pb one into PMN perovskite phase and this effect is directed by PbO excess during powder synthesis.

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Section: Introductionmentioning

confidence: 99%

Effect of PbO excess on the formation of lead magnesium niobate perovskite by the columbite method

Cavalheiro

Barrionuevo

Bruno

et al. 2004

Materials Chemistry and Physics

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“…Other weak diffrac tion peaks at 2=29. 2 and 33.8 were also found in the specimens of system B. Since these peaks matched the main peaks (222) and (400) of pyrochlore-type com pounds, pyrochlore phase are considered to be formed in system B.…”

Section: Methodsmentioning

confidence: 69%

Role of the Addition of Pb(Li1/4Fe1/4W1/2)O3 in the Low-Temperature Sintering and Dielectric Characteristics of Pb(Mg1/3Nb2/3)

Hwang

1996

J. Ceram. Soc. Japan

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R. . CThe sintering behavior and dielectric characteristics of Pb(Li1/4Fe1/4W1/2)O3-added Pb(Mg1/3Nb2/3)O3 ceram ics were investigated. Mixing the two end-members for 4h only formed a mixture, however, 48h-mixing mechanochemically induced the reactants to form partial perovskite solid-solutions. In the mixture speci men, the melt of Pb(Li1/4Fe1/4W1/2)O3 acted as a reactive liquid phase to substantially enhance the densifica tion of Pb(Mg1/3Nb2/3)O3, and caused grains to grow greatly and resulted in nonuniform microstructure. Regardless of mixing conditions, pure perovskite solid-solutions were formulated at 1000 when the con tent of Pb(Li1/4Fe1/4W1/2)O3 was less than 10 mass%, whereas, adding excess Pb(Li1/4Fe1/4W1/2)O3 unfavora bly caused polyhedral pyrochlore phase to form in the matrix. The addition of Pb(Li1/4Fe1/4W1/2)3 decreased the broad maximum of dielectric permittivity of sintered specimens; nevertheless, this addition markedly suppressed the temperature dependence of dielectric permittivity. The ceramics fabricated by the mixture of two end-members possessed a larger apparent diffusiveness of dielectric permittivity than those prepared from the partial solid-solution, implying that a wider compositional fluctuation likely occurred in the former specimen.

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“…The main problem in fabrication of pure perovskite PMN ceramics is formation of the unwanted pyrochlore phase with low dielectric constant which decreases the dielectric and electromechanical performances of the resulting material. Swartz et al [8] minimized the amount of the pyrochlore * UNIVERSITY OF SILESIA, FACULTY OF COMPUTER SCIENCE AND MATERIALS SCIENCE, 2 ŚNIEŻNA STR., 41-200 SOSNOWIEC, POLAND * * PEDAGOGICAL UNIVERSITY OF CRACOW, INSTITUTE OF PHYSICS, 2 PODCHORĄŻYCH STR., 30-084 KRAKÓW, POLAND phase using the so-called "columbite precursor method". This route consists in the precalcining of a stoichiometric mixture of MgO and Nb 2 O 5 in order to form MgNb 2 O 6 (which has a columbite structure), which subsequently reacts with PbO.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 Ceramics by Conventional Solid State Reaction Method

Nogas-Ćwikiel

Suchanicz

2013

Archives of Metallurgy and Materials

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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 MgNb2O6 has been synthesized. In the second step 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 has been obtained using MgNb2O6, PbO and BaTiO3. 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.

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Dielectric Properties of Lead‐Magnesium Niobate Ceramics

Cited by 525 publications

References 8 publications

Effect of PbO excess on the formation of lead magnesium niobate perovskite by the columbite method

Effect of PbO excess on the formation of lead magnesium niobate perovskite by the columbite method

Role of the Addition of Pb(Li<sub>1/4</sub>Fe<sub>1/4</sub>W<sub>1/2</sub>)O<sub>3</sub> in the Low-Temperature Sintering and Dielectric Characteristics of Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)

Fabrication of 0.95BaTiO3-0.05Pb(Mg1/3Nb2/3)O3 Ceramics by Conventional Solid State Reaction Method

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