Crystal structure and dielectric properties of ferroelectric ceramics in the BaO-Sm2O3-TiO2-Nb2O5 system

Zheng, X. H.; Chen, X.M.

doi:10.1016/s0038-1098(02)00709-3

Cited by 75 publications

(40 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[12][13][14] Filled TTBs, such as Ba 4 Na 2 Nb 10 O 30 , have also been shown to exhibit ferroelectricity concomitant with an incommensurate superstructure similar to that in unfilled stoichiometries. 13,15,16 In 2003, a family of filled TTB structured ceramics were reported based on Ba 4 RE 2 Ti 4 Nb 6 O 30 (RE = rare earth) [17][18][19][20] which built on earlier work by Ikeda et al 21 Ba 4 Figure 2a,b. 19,20 The incommensurately modulated compositions (RE = La, Bi) are relaxors whereas commensurately modulated ones (RE = Nd, Sm, Gd) are ferroelectric at room temperature and their Curie temperature (T C ) increases with decreasing ionic radius.…”

Section: ) Introductionmentioning

confidence: 99%

A Crystal-Chemical Framework for Relaxor versus Normal Ferroelectric Behavior in Tetragonal Tungsten Bronzes

et al. 2015

View full text Add to dashboard Cite

Tetragonal tungsten bronzes (TTBs), an important class of oxides known to exhibit ferroelectricity, undergo complex distortions, including rotations of oxygen octahedra, which give rise to either incommensurately or commensurately modulated superstructures. Many TTBs display broad, frequency-dependent relaxor dielectric behavior rather than sharper frequency-independent normal ferroelectric anomalies, but the exact reasons that favor a particular type of dielectric response for a given composition remain unclear. In this contribution the influence of incommensurate/commensurate displacive modulations on the onset of relaxor/ferroelectric behavior in TTBs is assessed in the context of basic crystal-chemical factors, such as positional disorder, ionic radii and polarizabilities, and point defects. We present a predictive crystal-chemical model that rationalizes composition–structure–properties relations for a broad range of TTB systems.

show abstract

Section: ) Introductionmentioning

confidence: 99%

A Crystal-Chemical Framework for Relaxor versus Normal Ferroelectric Behavior in Tetragonal Tungsten Bronzes

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Different ionic size substitutions at the above-mentioned sites can play an important role to tailor their physical properties [2][3][4][5]. Though a number of niobates such as Ba 5 [14][15][16][17][18][19][20][21] have shown very interesting electrical properties, which can further also be applicable for potential device applications. One of the main interests for using such materials is for nonlinear optical materials for second harmonic generation [22].…”

Section: Introductionmentioning

confidence: 99%

Structural, dielectric, electrical and piezoelectric properties of Ba4SrRTi3V7O30 (R=Sm, Dy) ceramics

Sahoo¹,

Panigrahi²,

Patri³

et al. 2008

Open Physics

View full text Add to dashboard Cite

Abstract:Polycrystalline samples of Ba 4 SrRTi 3 V 7 O 30 (R=Sm and Dy), members of the tungsten-bronze family, were prepared using a high-temperature, solid-state reaction technique and studied their electrical properties (using complex impedance spectroscopy) in a wide range of temperature (31-500 • C) and frequency (1 kHz -1 MHz). Preliminary structural (XRD) analyses of these compounds show the formation of single-phase, orthorhombic structures at room temperature. The scanning electron micrographs (SEM) provided information on the quality of the samples and uniform distribution of grains over the entire surface of the samples. Detailed studies of the dielectric properties suggest that they have undergone ferroelectric-paraelectric phase transition well above the room temperatures (i.e., 432 and 355 • C for R= Sm and Dy, respectively, at frequency 100 kHz). Measurements of electrical conductivity (ac and dc) as a function of temperature suggest that the compounds have semiconducting properties much above the room temperature, with negative temperature coefficient of resistance (NTCR) behavior. The existence of ferroelectricity in these compounds was confirmed from a polarization study.

show abstract

“…Recently, the incommensurate structure of SBN was solved and refined as a five dimensional (5D) modulated structure in the superspace formalism. [49] In 2012, Graetsch et al [50][51] [52][53][54][55] demonstrated that both Bi-and La-based compounds exhibit relaxor behavior, whereas Nd-, Sm-, and Gd-based analogs are classical ferroelectrics. In Ba 2 RENb 3 Ti 2 O 15 compounds, deviations from the ideal TTB symmetry caused by an incommensurate modulation was associated with relaxor behavior, whereas a commensurate modulation was observed for phases exhibiting ferroelectric behavior.…”

Section: Wwweurjicorg Full Papermentioning

confidence: 99%

Growth and Characterization of Centimeter‐Sized Ba₂LaFeNb₄O₁₅ Crystals from High‐Temperature Solution under a Controlled Atmosphere

et al. 2013

View full text Add to dashboard Cite

Centimeter-sized single crystals of Ba 2 LaFeNb 4 O 15 were grown from a high-temperature solution by using LiBO 2 flux and a sealed platinum assembly. The obtained single crystals display the same physical properties as their ceramic counterparts. A frequency-dependent dielectric permittivity maximum was found (T m = 100 K at 5 kHz), which indicates relaxor behavior. Magnetic susceptibility measurements revealed purely paramagnetic behavior between 10 and 350 K. X-ray diffraction measurements of Ba 2 LaFeNb 4 O 15 single

show abstract

Crystal structure and dielectric properties of ferroelectric ceramics in the BaO-Sm2O3-TiO2-Nb2O5 system

Cited by 75 publications

References 18 publications

A Crystal-Chemical Framework for Relaxor versus Normal Ferroelectric Behavior in Tetragonal Tungsten Bronzes

A Crystal-Chemical Framework for Relaxor versus Normal Ferroelectric Behavior in Tetragonal Tungsten Bronzes

Structural, dielectric, electrical and piezoelectric properties of Ba4SrRTi3V7O30 (R=Sm, Dy) ceramics

Growth and Characterization of Centimeter‐Sized Ba₂LaFeNb₄O₁₅ Crystals from High‐Temperature Solution under a Controlled Atmosphere

Contact Info

Product

Resources

About

Crystal structure and dielectric properties of ferroelectric ceramics in the BaO-Sm2O3-TiO2-Nb2O5 system

Cited by 75 publications

References 18 publications

A Crystal-Chemical Framework for Relaxor versus Normal Ferroelectric Behavior in Tetragonal Tungsten Bronzes

A Crystal-Chemical Framework for Relaxor versus Normal Ferroelectric Behavior in Tetragonal Tungsten Bronzes

Structural, dielectric, electrical and piezoelectric properties of Ba4SrRTi3V7O30 (R=Sm, Dy) ceramics

Growth and Characterization of Centimeter‐Sized Ba2LaFeNb4O15 Crystals from High‐Temperature Solution under a Controlled Atmosphere

Contact Info

Product

Resources

About

Growth and Characterization of Centimeter‐Sized Ba₂LaFeNb₄O₁₅ Crystals from High‐Temperature Solution under a Controlled Atmosphere