Synthesis and dielectric properties of Ba1−xR2x/3Nb2O6 (R: rare earth) with tetragonal tungsten bronze structure

Wakiya, Naoki; Wang, Jui-Kai; Saiki, Atsushi; Shinozaki, Kazuo; Mizutani, Nobuyasu

doi:10.1016/s0955-2219(98)00376-8

Cited by 150 publications

(65 citation statements)

References 10 publications

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“…inter-planar spacing d (i.e., 3 (estimated standard deviation in parenthesis). The unit cell parameters and crystal system of the compound are very much consistent with those reported earlier [14].…”

Section: Structure/microstructurementioning

confidence: 99%

“…Tungsten-bronze (TB) compounds belong to an important class of dielectric materials, which display interesting ferroelectric, pyroelectric, piezoelectric and nonlinear optic behaviors [1][2][3]. Since the discovery of ferroelectricity in lead meta-niobate [4,5] and lead meta tantalate [6], there has been rapid progress in search of new TB-type materials, required for various electronic devices such as multi-layer capacitors, transducers, actuators, random access memory, microwave dielectric resonators, phase shifters, pyroelectric detectors, etc because of their relatively high dielectric constant and low dielectric loss [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

et al. 2012

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Abstract:The polycrystalline sample of complex tungsten-bronze type compound (Na 2 Pb 2 La 2 W 2 Ti 4 Ta 4 O 30 ) was prepared by a high-temperature solid-state reaction technique. Room temperature preliminary structural study using X-ray diffraction (XRD) data exhibits the formation of a single-phase new compound. The SEM micrograph of the compound exhibits non uniform rectangular grains distributed throughout the sample surface. Detailed studies of dielectric parameters (ε r , tan δ) as a function of temperature and frequency, and P-E hysteresis (spontaneous polarization) confirmed the existence of ferroelectricity in the material. Complex impedance spectroscopy analysis, carried out as a function of frequency at different temperatures, established a correlation between the microstructure and electrical properties of the material. The electrical relaxation process occurring in the material is temperature dependent. The activation energy found from the Arrhenius plot that the conduction process in the material is of mixed type. The nature of frequency dependence of ac conductivity suggests that the material obeys Jonscher's universal power law.

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Section: Structure/microstructurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

et al. 2012

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“…A few general observations have been reported [21] as well as more quantitative predictive parameters, for example tolerance factor [22] (analogous to perovskites), but the latter includes an additional proviso regarding the electronegativity difference [23] between the cations and anions. While these provide a starting point, they do not seem to be universal for this structure and developing a more complete understanding of structure-property relationships is vital if novel multiferroic materials are to be designed with this structure type.…”

Section: Introductionmentioning

confidence: 99%

Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes

Rotaru

Miller

Arnold

et al. 2014

Phil. Trans. R. Soc. A.

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We discuss the strategy for development of novel functional materials with the tetragonal tungsten bronze structure. From the starting composition Ba 6 GaNb 9 O 30 , the effect of A- and B-site substitutions on the dielectric properties is used to develop an understanding of the origin and stability of the dipolar response in these compounds. Both tetragonal strain induced by large B-site cations and local strain variations created by isovalent A-site substitutions enhance dipole stability but result in a dilute, weakly correlated dipolar response and canonical relaxor behaviour. Decreasing cation size at the perovskite A2-site increases the dipolar displacements in the surrounding octahedra, but insufficiently to result in dipole ordering. Mechanisms introducing small A-site lanthanide cations and incorporation of A-site vacancies to induce ferroelectricity and magnetism are presented.

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“…The stability of the tetragonal tungsten bronze (TTB) structure compound can be determined by Tolerance factor (t) discussed by Wakiya et al [22] According to the general formula of TTB, two types of A sites are present, one is A1 site with 12 fold coordination which is identical as perovskite structure and A2 site with 15 fold coordination which occupies pentagonal site. Thus value of tolerance factor (t) can be calculated by following relation [23] ( )…”

Section: The Stability Of the Crystal Structurementioning

confidence: 99%

Study of Structural and Dielectrical Properties of Lead Free Polycrystalline Electro Ceramics Ba5CaTi2Nb8O30 (BCTN) for Microwave Tunable Device Applications

Jindal¹,

Devi²,

Vasishth³

et al. 2018

MSA

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Tungsten bronze structure ceramics have found vital potential in many applications such as actuators, transducer, electro-optic, ferroelectric random access memory and microwave devices. These type ceramics are extensively used in many industrial applications due to their spontaneous polarization and wellknown for its high dielectric constant, low dielectric loss, low leakage current density, good thermal stability and high piezoelectric coefficient. In present work, Ba 5 CaTi 2 Nb 8 O 30 (BCTN) has been synthesized first time through solid state reaction method. The microstructures, dielectric, ferroelectric, ferromagnetic and Raman spectra have been investigated by means of X-ray diffraction, Scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDAX), LCR meter, P-E loop tracer, VSM and Raman spectrometer respectively. X-ray diffraction study revealed the formation of single phase tetragonal structure with space group P4bm. The crystallite size was observed to be in the range 14.4 nm. Detailed dielectric properties of BCTN compound as function of temperature at different frequencies show that sample exhibits diffuse type transition at curie temperature 316˚C. The P-E and M-H studies confirmed the coexistent ferroelectricity and magnetism at room temperature.

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Synthesis and dielectric properties of Ba1−xR2x/3Nb2O6 (R: rare earth) with tetragonal tungsten bronze structure

Cited by 150 publications

References 10 publications

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes

Study of Structural and Dielectrical Properties of Lead Free Polycrystalline Electro Ceramics Ba<SUB>5</SUB>CaTi<SUB>2</SUB>Nb<SUB>8</SUB>O<SUB>30</SUB> (BCTN) for Microwave Tunable Device Applications

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Synthesis and dielectric properties of Ba1−xR2x/3Nb2O6 (R: rare earth) with tetragonal tungsten bronze structure

Cited by 150 publications

References 10 publications

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

Dielectric and electrical properties of Na2Pb2La2W2Ti4Ta4O30 electroceramics

Towards novel multiferroic and magnetoelectric materials: dipole stability in tetragonal tungsten bronzes

Study of Structural and Dielectrical Properties of Lead Free Polycrystalline Electro Ceramics Ba&lt;SUB&gt;5&lt;/SUB&gt;CaTi&lt;SUB&gt;2&lt;/SUB&gt;Nb&lt;SUB&gt;8&lt;/SUB&gt;O&lt;SUB&gt;30&lt;/SUB&gt; (BCTN) for Microwave Tunable Device Applications

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Study of Structural and Dielectrical Properties of Lead Free Polycrystalline Electro Ceramics Ba<SUB>5</SUB>CaTi<SUB>2</SUB>Nb<SUB>8</SUB>O<SUB>30</SUB> (BCTN) for Microwave Tunable Device Applications