Fabrication, characterisation and formation mechanism of Pb1.83Mg0.29Nb1.71O6.39 pyrochlore

Mergen, A.; Lee, W.E.

doi:10.1016/s0955-2219(96)00187-2

Cited by 48 publications

(30 citation statements)

References 19 publications

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“…The second type (pyrochlore phase type II) with more complex composition of Pb 1.83 Nb 1.71 Mg 0.29 O 6.39 (JCPDS card 37-71) has been detected in powders calcined at higher temperatures (above 750°C). The same results were reported earlier by other authors [6,7]. The patterns show that with calcination temperature of 500°C the reaction is not complete and mixture of residual PbO (Litharge, JCPDS card 5-561 and Massicot, JCPDS card 38-1477) and pyrochlore phase type I can be detected.…”

Section: Resultssupporting

confidence: 89%

“…These properties make it suitable for applications such as multilayer capacitors, electrostrictive actuators, electromechanical transducers and electro-optic devices [2][3][4][5]. One of the major problems facing the applications of PMN ceramics is the production of Lead Niobate based pyrochlore phase with low dielectric constant [2,6,7] (about 130 in comparison with 20,000 for single-phase perovskite structure) during the heating process. The presence of pyrochlore phase can degrade dielectric properties of PMN-based ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of PMN pyrochlore free ceramics via a modified mixed oxide method

Moetakef

Nemati

2007

J Electroceram

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A modified mixed oxide method which is based on a two step reaction sintering process was designed to obtain single phase PMN ceramics. In this regard, pyrochlore phase formation during calcination process at different calcination temperatures was studied to determine the best soaking temperature for the first step in the specified method. In other words, the calcination temperature in which the least pyrochlore phase produced was chosen as the first step soaking temperature. The results showed that by utilizing this new method, single phase PMN ceramics with a high relative density of 98% can be synthesized successfully using conventional mixed oxide starting materials.

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Synthesis of PMN pyrochlore free ceramics via a modified mixed oxide method

Moetakef

Nemati

2007

J Electroceram

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“…The main obstacle in PMN-PT synthesis is forming a lead niobate-based pyrochlore phase, frequently formed in the initial stage of the reactions processes for different methods. The presence of such a pyrochlore phase in the PMN-PT system is commonly believed to significantly degrade their dielectric properties, and therefore, the resulting material is inadequate for technological applications or a systematic scientific study (Mergen & Lee, 1997;Swartz & Shrout, 1982;Shrout & Swartz, 1983). Thus, choosing the synthesis method is fundamental to prepare pyrochlore-free PMN-PT of good quality.…”

Section: Processing and Synthesis Of Pmn-ptmentioning

confidence: 99%

Recent Advances in Processing, Structural and Dielectric Properties of PMN-PT Ferroelectric Ceramics at Compositions Around the MPB

Araújo¹

2011

Advances in Ceramics - Electric and Magnetic Ceramics, Bioceramics, Ceramics and Environment

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“…EXPERIMENTAL Pb 1.83 Mg 0.29 Nb 1.71 O 6.39 pyrochlore ceramic samples were produced by solid state reaction of mixed oxide powders described in details in Refs. 5,7 . PbO (99.5%), Nb 2 O 5 (99.5%) and MgO (97%) powders were mixed and sintered at 880 • C for 8 hours.…”

Section: Introductionmentioning

confidence: 99%

Quantum paraelectric behavior of pyrochlorePb1.83Mg0.29Nb1.71O6.39

Kamba¹,

Денисов²,

Veljko³

et al. 2007

Phys. Rev. B

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Pb1.83Mg0.29Nb1.71O6.39 (PMN) crystallizing in a cubic pyrochlore structure exhibits, as the first dielectrics with pyrochlore structure, typical feature of quantum paraelectrics -its permittivity continuously increases on cooling and levels off below ∼ 30 K without any signature of a structural phase transition. Broad-band dielectric spectra do not show any dielectric dispersion in the real part of permittivity up to 8.8 GHz. THz and infrared spectra reveal a soft polar optic mode which is responsible for the temperature dependence of the permittivity. The leveling-off of the permittivity at low temperatures obeys the Barrett formula and the fitted vibrational zero-point energy 1 2 kBT1 corresponds to the measured soft mode frequency. The number of observed infrared phonons exceeds that predicted from the factor-group analysis which indicates that the structure is at least locally non-cubic.

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Fabrication, characterisation and formation mechanism of Pb1.83Mg0.29Nb1.71O6.39 pyrochlore

Cited by 48 publications

References 19 publications

Synthesis of PMN pyrochlore free ceramics via a modified mixed oxide method

Synthesis of PMN pyrochlore free ceramics via a modified mixed oxide method

Recent Advances in Processing, Structural and Dielectric Properties of PMN-PT Ferroelectric Ceramics at Compositions Around the MPB

Quantum paraelectric behavior of pyrochlorePb1.83Mg0.29Nb1.71O6.39

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