A New Mechanism of Nonstoichiometric 1:1 Short‐Range Ordering in NiO‐Doped Pb(Mg1/3Nb2/3)O3 Relaxor Ferroelectrics

Lee, Kyu-Mann; Jang, Hyun M.

doi:10.1111/j.1151-2916.1998.tb02665.x

Cited by 18 publications

(4 citation statements)

References 30 publications

(65 reference statements)

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“…The bulk electrical resistivity for a given semicircle was obtained from the intercept of the semicircle with the Z′‐axis, and the corresponding dielectric permittivity was estimated from the peak of the semicircle. In comparison of dielectric permittivity estimated from the complex impedance spectrum with that from the temperature‐dependent dielectric permittivity spectrum, it is confirmed that the semicircle was caused by a conducting mechanism mainly related to the bulk perovskite grains . According to the calculation results based on impedance data, it is found that the doping of Fe, Co, and Ni ions leads to the decrease of electrical resistivity, which can be attributed to the generation of positively charged carriers.…”

Section: Resultsmentioning

confidence: 74%

Identification of Substitution Mechanism in Group VIII Metal Oxides Doped Pb(Zn_1/3Nb_2/3)O₃–PbZrO₃–PbTiO₃ Ceramics with High Energy Density and Mechanical Performance

et al. 2013

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Group VIII metal oxides, that is, Fe 2 O 3 , Co 2 O 3 , and NiO have been introduced to 0.2Pb(Zn 1/3 Nb 2/3 )O 3 -0.8Pb(Zr 0.50 Ti 0.50 )O 3 (PZN-PZT) to deterministically identify the substitution mechanism and meantime to tailor mechanical and piezoelectric properties in obtaining energy harvesting materials. On the basis of the X-ray diffraction and Raman analysis, it is clear that the group VIII metal oxides induce a phase transformation from the morphotropic phase boundary to the tetragonal phase side, and the corresponding grain size increases accordingly. It is reasonable to deduce that two types of substitution behaviors coexist in the group VIII metal oxides added PZN-PZT system. Due to the mixed valence of +2 and +3, the foreign doping ions prefer to enter the B site in the perovskite structure, not only substituting for Ti 4+ , Zr 4+ , and Nb 5+ ions in the inequivalence replacement but also substituting for Zn 2+ ions in the equivalence replacement. The proposed complex substitution mechanisms can give the full explanation about the grain growth phenomena and the variation in mechanical and electric properties in the modified PZN-PZT system. At the same doping level of 0.3 mol%, the maximum transduction coefficient (d 33 Ág 33 = 13120 3 10 À15 m 2 /N) and good fracture toughness (K IC = 1.32 MPa m 1/2 ) are obtained in Co 2 O 3 added 0.2PZN-0.8PZT ceramics, which shows great promise as practical materials for energy harvesting device applications.C. Randall-contributing editor Manuscript No. 32515.

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Section: Resultsmentioning

confidence: 74%

Identification of Substitution Mechanism in Group VIII Metal Oxides Doped Pb(Zn_1/3Nb_2/3)O₃–PbZrO₃–PbTiO₃ Ceramics with High Energy Density and Mechanical Performance

et al. 2013

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“…Tungsten bronze (TB) structure based polar dielectrics form a very important class of non-toxic materials offering competent structural, electrical, optical, photocatalytic and electrocaloric response compared to corresponding toxic perovskite oxides like lead magnesium niobate (PMN), lead zirconium niobate (PZN), lead zirconium titanate (PZT), lanthanum-modified lead zirconate titanate (PLZT), lead scandium niobate (PSN) etc [1][2][3] . Many TB structures offer variety of applications emerging from NbO6 octahedral distortions and phase transition between different polymorphs.…”

Section: Introductionmentioning

confidence: 99%

Microwave derived monoclinic Ba1-xSnxNb2O6 materials as an alternative of ITO

Joshi

Shrivastava

Pritam

2020

Journal of Alloys and Compounds

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Microwave synthesis was optimized for preparing novel monoclinic Tin-doped Barium Niobate ceramics (Ba1-xSnxNb2O6; x= 0.0, 0.01, 0.05, 0.1, 0.2, 0.3) BSN. The intensity of monoclinic phase formation was observed to decrease on increasing tin as dopant indicating decreased crystallinity. Strained crystalline phase was observed in undoped sample that became severe on doping tin. Monoclinic metal alloy Sn2O3 formation was confirmed on increasing tin doping beyond 5%. Electronic configuration of tin (II) oxide supports the local site-wise monoclinic disorder in crystal structure due to sterically active lone pair. Such a disorder arranges increased number of degenerate energy states and reduce effective energy gap between conduction band minimum and valence band maximum. All BSN compositions were investigated for monoclinic phase stabilization, ultra-violet absorption, dielectric response, raman modes and type of carrier concentration along with hall resistivity. All measurements possessed inflexion corresponding to 5 atomic % tin doping indicating successful site substitution and estimated Sn2O3 metal formation beyond this. The values of reducing optical energy band gap, transparency to visible spectrum and hall resistivity indicated utility of these materials as a substitute transparent conducting oxide (TCO) for well-known indium tin oxide (ITO).

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“…Esta y otras características son las que hacen que este conjunto de materiales sean clasificados como Relaxores (RE). Este es el caso del PMN (PbMg 1/3 Nb 2/3 O 3 ), cuya TFD es función del ordenamiento químico a corta distancia de las especies del sitio B (Mg +2 y Nb +5 ) en la estructura perovskita A(B',B'')O 3 [1,2].En este tipo de estructura perovskita, el comportamiento RE se puede generar a través de dos tipos de distorsiones: electrostática y mecánica. Mientras la distorsión mecánica proviene de las diferencias de radios iónicos de los cationes B y causa la distorsión de la red del cristal directamente, la distorsión de origen electrostática es generada por un desequilibrio de cargas en la red del cristal, debido a la existencia de micro-regiones ricas en niobio.…”

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Estudio de la adición de K<sup>+</sup> y LiNbO<sub>3</sub> en las propiedades finales del Relaxor PMN procesado por mezcla de polvos

Cavalheiro¹,

Zaghete²,

Cilense³

et al. 2004

Bol. Soc. Esp. Ceram. Vidr.

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El relaxor cerámico PMN ha sido investigado por un gran número de investigadores en el transcurso del tiempo y muchos aspectos de este material, como la morfología de los polvos, descomposición de fases, pérdida de peso en el proceso de sinterización, densificación, entre otras, siguen siendo objetos de investigación. La preparación de polvos de PMN se ha mostrado más efectiva cuando son sintetizados por la ruta de la columbita, pero la etapa de adición de plomo para la síntesis de polvos de PMN todavía sigue problemática. Por lo tanto, este trabajo propone una nueva asociación de metodologías, utilizando la ruta de la columbita y el método de precipitación por hidróxidos. Mediante la utilización de una técnica de mezcla de polvos, la cual permitió lograr buenas densidades en verde y sinterizadas, fue posible observar que los dopantes K + y Li + reducen las pérdidas de peso en el proceso de sinterización y cambian significativamente las propiedades dieléctricas. La adición de semillas de LiNbO 3 en la etapa de conformación, las cuales reaccionan de modo distinto dependiendo del tamaño de las partículas, promueve la formación de granos de diferente tamaño en el cuerpo cerámico. Como consecuencia de esto, propiedades dieléctricas muy diferentes que en la cerámica PMN convencional son obtenidas.Palabras Clave: PMN, Relaxor, Microestructura, Procesamiento y Sinterización. Study of k and LiNbO 3 addition on the final properties of the relaxor pmn processed by powder blendPMN ceramic relaxor has been investigated by several researchers and many aspects of this material, like powder morphology, phase decomposition, weight loss during sintering process, densification, between others, still are investigated. PMN powder preparation has been shown more efficient when synthesized by columbite route, however lead addition stage for the PMN powder synthesis remains problematical. Therefore, this work proposes a new association of methodologies, using columbite route and the hydroxide precipitation method. Through use of the powder mixture technique, which permitted to obtain good green and sintered densities, was possible to observe K + y Li + dopants reduce weight loss in sintering process and change significantly the dielectric properties. Addition of LiNbO 3 seeds in conformation stage, which react in a distinct way as a function of the particle size, promotes the formation of differenced grains in the ceramic bulk. Consequently, very different dielectrics properties from conventional PMN ceramic were obtained.Key words: PMN, Relaxor, Microstructure, Processing and Sinterization. INTRODUCCIÓNLas cerámicas ferroeléctricas se usan habitualmente en condensadores, memorias ferroeléctricas, dispositivos de ultrasonido, entre otras aplicaciones. Sin embargo, algunos de estos materiales ferroeléc-tricos son algo distintos de los Ferroeléctricos Normales (FN) con respecto la transición desde la fase ferroeléctrica a la paraeléctrica (transición FE/PE). Las diferencias con los FN es que en estos materiales no hay una solo temperatu...

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A New Mechanism of Nonstoichiometric 1:1 Short‐Range Ordering in NiO‐Doped Pb(Mg1/3Nb2/3)O3 Relaxor Ferroelectrics

Cited by 18 publications

References 30 publications

Identification of Substitution Mechanism in Group VIII Metal Oxides Doped Pb(Zn_1/3Nb_2/3)O₃–PbZrO₃–PbTiO₃ Ceramics with High Energy Density and Mechanical Performance

Identification of Substitution Mechanism in Group VIII Metal Oxides Doped Pb(Zn_1/3Nb_2/3)O₃–PbZrO₃–PbTiO₃ Ceramics with High Energy Density and Mechanical Performance

Microwave derived monoclinic Ba1-xSnxNb2O6 materials as an alternative of ITO

Estudio de la adición de K<sup>+</sup> y LiNbO<sub>3</sub> en las propiedades finales del Relaxor PMN procesado por mezcla de polvos

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A New Mechanism of Nonstoichiometric 1:1 Short‐Range Ordering in NiO‐Doped Pb(Mg1/3Nb2/3)O3 Relaxor Ferroelectrics

Cited by 18 publications

References 30 publications

Identification of Substitution Mechanism in Group VIII Metal Oxides Doped Pb(Zn1/3Nb2/3)O3–PbZrO3–PbTiO3 Ceramics with High Energy Density and Mechanical Performance

Identification of Substitution Mechanism in Group VIII Metal Oxides Doped Pb(Zn1/3Nb2/3)O3–PbZrO3–PbTiO3 Ceramics with High Energy Density and Mechanical Performance

Microwave derived monoclinic Ba1-xSnxNb2O6 materials as an alternative of ITO

Estudio de la adición de K<sup>+</sup> y LiNbO<sub>3</sub> en las propiedades finales del Relaxor PMN procesado por mezcla de polvos

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Identification of Substitution Mechanism in Group VIII Metal Oxides Doped Pb(Zn_1/3Nb_2/3)O₃–PbZrO₃–PbTiO₃ Ceramics with High Energy Density and Mechanical Performance

Identification of Substitution Mechanism in Group VIII Metal Oxides Doped Pb(Zn_1/3Nb_2/3)O₃–PbZrO₃–PbTiO₃ Ceramics with High Energy Density and Mechanical Performance