Structure and dielectric behavior of Nd-doped BaTiO3 perovskites

Yao, Zhonghua; Liu, Hanxing; Liu, Yan; Wu, Zhaohui; Shen, Zong–Yang; Liu, Yang; Cao, Minghe

doi:10.1016/j.matchemphys.2007.12.019

Cited by 193 publications

(60 citation statements)

References 46 publications

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“…In the paraelectric phase (above 120°C), the optical modes in Raman spectra transform according to the triply degenerate irreducible representation, 3F 1u ? F 2u of the Pm3 m symmetry [14]. Here the F 1u mode is only infrared active and the F 2u mode is silent, which suggest that there is no Raman-active mode in paraelectric phase of barium titanate.…”

Section: Raman Spectroscopymentioning

confidence: 90%

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Jain

Panwar

Jha

2016

J Mater Sci: Mater Electron

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In the present study, specimens of composition Ba 1-x Sr x TiO 3 (x = 0.0, 0.05, 0.075, 0.10 & 0.15) were synthesized using mechanochemical activation technique and their structural, dielectric and ferroelectric characteristics were investigated for the major applications such as a multi-layered ceramic capacitor (MLCC) and microwave tunable devices. Structural analysis using X-ray diffraction pattern of the systems by Rietveld refinement confirms the formation of tetragonal phase with P4 mm space group. The intensity ratio of bonds and wave number shift in Raman spectra suggests little structural changes with strontium content. Microstructural investigation reveals that there is no appreciable change in grain size with increasing strontium concentration. The results on the variation of dielectric constant with temperature suggest the shifting of Curie temperature to lower temperature side with increasing strontium concentration. Current-voltage characteristics reveal that with increasing strontium content current increases which can be correlated with the observed variation of activation energy of the studied samples, which also decreases with the increasing concentration of strontium.

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Section: Raman Spectroscopymentioning

confidence: 90%

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Jain

Panwar

Jha

2016

J Mater Sci: Mater Electron

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“…Ba 2+ , K + , Nd 3+ (R=1.27 Å) and a small fraction of the structural A-site vacancies are expected to disrupt ferroelectric correlations among the A-cation displacements (Criterion 3). While Nd exhibits a small ionic radius and, as such, could be displaced off-center, it is known, as other rare-earth cations, to suppress the ferroelectric behavior in compounds like BaTiO3 and BiFeO3 [16,20]. The Fe 3+ (R=0.645 Å) ions are non-ferroelectric but support large lattice distortions in the tetragonal PbTiO3-BiFeO3 phase [21,22], and, thus, may not necessarily act species.…”

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confidence: 99%

Designing pseudocubic perovskites with enhanced nanoscale polarization

Levin

Laws

Wang

et al. 2017

Applied Physics Letters

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A crystal-chemical framework has been proposed for the design of pseudocubic perovskites with nanoscale ferroelectric order, and its applicability has been demonstrated using a series of representative solid solutions that combined ferroelectric (K0.5Bi0.5TiO3, BaTiO3, PbTiO3) and antiferroelectric (Ndsubstituted BiFeO3) end members. The pseudocubic structures obtained in these systems exhibited distortions that were coherent on a scale ranging from sub-nanometer to tens of nanometers but, in all cases, the macroscopic distortion remained unresolvable even if using high-resolution X-ray powder diffraction. Different coherence lengths for the local atomic displacements account for the distinctly different dielectric, ferroelectric, and electromechanical properties exhibited by the samples. The guidelines identified provide a rationale for chemically tuning the coherence length to obtain the desired functional response.

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“…This phenomena were strongly related with the shifting of maximum permittivity at Tc of Nd-Doped BaTiO3 at tetragonal phase to cubic phase above Tc. Generally, in heavily doped BaTiO3 ceramics grain size is usually suppressed and the permittivity of BaTiO3 ceramics attains the maximum when the grain size is 1μm or less [9]. Factors that influence permittivity include type of dopant, doping mechanism, processing conditions and grain size [10].…”

Section: +mentioning

confidence: 99%

Structural and electrical properties of Barium Titanate (BaTiO3) and Neodymium doped BaTiO₃ (Ba_0.995Nd_0.005TiO₃)

et al. 2017

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Abstract. Barium titanate (BaTiO3) and Neodymium (Nd) doped BaTiO3 with composition Ba0.995Nd0.005TiO3 were prepared using conventional solid state reaction method to study the dielectric properties of materials. Pure phase samples were found at final heating temperature of 1400 ᵒC for overnight. X-ray diffraction analysis reveals the changes in the lattice parameter and unit cell volume of the pure perovskite tetragonal structure with space group (P4mm). Electrical analysis is carried out to investigate the dielectric properties, conductivity behaviour and dielectric loss of BaTiO3 and Ba0.995Nd0.005TiO3. Ba0.995Nd0.005TiO3 have a broaden dielectric peaks with high permittivity of 8000 and reasonably low loss tan δ which is about 0.004 (1 kHz).

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Structure and dielectric behavior of Nd-doped BaTiO3 perovskites

Cited by 193 publications

References 46 publications

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Designing pseudocubic perovskites with enhanced nanoscale polarization

Structural and electrical properties of Barium Titanate (BaTiO3) and Neodymium doped BaTiO₃ (Ba_0.995Nd_0.005TiO₃)

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Structure and dielectric behavior of Nd-doped BaTiO3 perovskites

Cited by 193 publications

References 46 publications

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Designing pseudocubic perovskites with enhanced nanoscale polarization

Structural and electrical properties of Barium Titanate (BaTiO3) and Neodymium doped BaTiO3 (Ba0.995Nd0.005TiO3)

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Structural and electrical properties of Barium Titanate (BaTiO3) and Neodymium doped BaTiO₃ (Ba_0.995Nd_0.005TiO₃)