Effect of ionic radii on the Curie temperature in Ba1-x-ySrxCayTiO3 compounds

Berenov, A.; Goupil, Florian Le; Alford, Neil McN.

doi:10.1038/srep28055

Cited by 27 publications

(8 citation statements)

References 61 publications

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“…This temperature is close to the phase transition temperature detected in BSF17.5 by Gil-González et al at 150 C and attributed to the Pbam+Pnma/Pnma transformation [18]. The stabilization of the Pnma phase might be attributed to the effect of the substitution of Bi 3+ ions by smaller Sm 3+ ions (r = 1.36 Å and 1.28 Å, respectively for the ions in 12 coordinate geometry [44]), resulting in a lattice distortion and unit cell volume reduction [45,46]. The peak at about 400 C, visible in the high frequency curves in all compositions, is probably related to the antiferromagnetic Néel temperature, in agreement with Gil-González et al [18].…”

Section: Resultssupporting

confidence: 78%

Phase evolution and electrical behaviour of samarium-substituted bismuth ferrite ceramics

Viola

Zhang

et al. 2018

Journal of the European Ceramic Society

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Bi1-xSmxFeO3 (x = 0.15-0.18) ceramics with high density were produced using spark plasma sintering. The effects of composition, synthesis conditions and temperature on the phase evolution were studied, using XRD, TEM and dielectric spectroscopy. The coexistence of the ferroelectric R3c, antiferroelectric Pnam and paraelectric Pnma phases was revealed, with relative phase fractions affected by both calcination conditions and Sm concentration.Experiments on powdered samples calcined at different temperatures up to 950 C suggest higher calcination temperatures promote Sm diffusion, allowing samples to reach compositional homogeneity. The structural transitions from the Pnam and R3c phases to the Pnma phase were comprehensively investigated, with phase transition temperatures clearly identified. The dielectric permittivity, electrical resistivity and breakdown strength were increased upon Sm-substitution, while ferroelectric switching was suppressed. The polarizationelectric field loop became increasingly narrow with increasing Sm-content, but double hysteresis loops, which may reflect a reversible antiferroelectric to ferroelectric transformation, were not observed.

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Section: Resultssupporting

confidence: 78%

Phase evolution and electrical behaviour of samarium-substituted bismuth ferrite ceramics

Viola

Zhang

et al. 2018

Journal of the European Ceramic Society

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“…The lattice constant can further be described by ionic radii of the constituent atoms . In addition to the band gap, the ionic radius could have strong effects on the Curie temperature in ferroelectronic perovskites …”

Section: Introductionmentioning

confidence: 99%

“…23 In addition to the band gap, the ionic radius could have strong effects on the Curie temperature in ferroelectronic perovskites. 24 Given the significance of ionic size, availability of accurate data of ionic radii is crucial for the description and prediction of materials properties. Shannon radii (i.e., the effective ionic radii) have been accepted as reliable data in a wide range of applications.…”

Section: Introductionmentioning

confidence: 99%

Exploiting Ionic Radii for Rational Design of Halide Perovskites

Ouyang

2019

Chem. Mater.

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Emerging perovskite solar cell technology has inspired extensive study of perovskite materials, with a recent focus on the search of stable and environmentally benign lead-free alternatives. The huge compositional space of the perovskites family necessitates rational strategies, for which predictive descriptors that relate target properties to a few key variables are crucial. Among others, ionic radius plays key roles on many important materials properties. In this work, to unlock the full potential of ionic radius for rational materials design (1) the widely used Shannon radii data set were consistently expanded to more than twice as large by extending to unusual oxidation states and arbitrary coordination, (2) new criterion for improved prediction of perovskites formability was proposed, (3) a general and predictive band gap physical descriptor with radius and normalized volume as inputs was discovered for a wide range of three-dimensional halide perovskites. These results offer new opportunities for perovskites design by exploiting radii.

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“…A-site doping elements such as Sr [14], Ca [15], La [16], Ce [17], Ag [18] and Bsite doping elements such as Fe [19], Zr [20], Li [21], Sm [22], Mn [23] are some of the dopants of BT. These dopants cause structural distortions which strongly affect the Curie temperature (T c ) and phase transition of the resulting material [24][25][26][27]. Since radius of Sr +2 ions is smaller compared to that of the Ba +2 ions, Sr doping in BT affects the tolerance factor [28] and modifies the lattice parameters.…”

Section: Introductionmentioning

confidence: 99%

“…BST also shows good frequency [30] and temperature dependent electrical as well as dielectric properties. As a result, Ba 1-x Sr x TiO 3 (BST) ceramics are widely used in telecommunication, multilayer capacitors, microwave phase shifters, sensors, transducers, dynamic access memory, and others [9,24,31,32].…”

Section: Introductionmentioning

confidence: 99%

Structural, Dielectric and Ferroelectric Characterizations of Sol-gel Prepared Ba_1-xSr_xTiO₃ Nanoceramics

Singh

Dixit

Dobal

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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Ba1-xSrxTiO3 (0.0 ≤ x ≤ 0.5) nanoceramics were synthesized via sol-gel route and the structural and electric properties of the resulting compositions were investigated. revealed A tetragonal crystal structures for x = 0.0 - 0.3 and a cubic structure for x = 0.5 compositions was revealed by X-ray diffraction. The smaller ionic radii of Sr ions resulted in the lowering of c/a ratio with increasing x and a tetragonal to cubic structural transformation was observed at around x = 0.4. The average crystallite size gradually decreased with increasing x from 0 to 0.5. This trend was visible in electron micrographs. The room temperature dielectric constant in these nanoceramics increases with increasing Sr and a maximum value of 1553 was observed for x=0.3. Curie temperature (Tc ) of 125 °C was obtained for x=0.0, which shifted toward lower temperature with increasing x value. The value of Tc was observed as 100 and 75 °C for x = 0.1 and 0.3, respectively. The remnant polarization (Pr ), saturation polarization (Ps ), and coercive field (Ec ) decreased with increasing Sr concentration in BT due to the structural modifications. Value of Pr decreases from 0.637 to 0.229 μC/cm2, Ps decreases from 8.910 to 3.238 μC/cm2 and Ec decreases from 0.631 to 0.255 kV/cm with increasing x from 0 to 0.5.

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Effect of ionic radii on the Curie temperature in Ba1-x-ySrxCayTiO3 compounds

Cited by 27 publications

References 61 publications

Phase evolution and electrical behaviour of samarium-substituted bismuth ferrite ceramics

Phase evolution and electrical behaviour of samarium-substituted bismuth ferrite ceramics

Exploiting Ionic Radii for Rational Design of Halide Perovskites

Structural, Dielectric and Ferroelectric Characterizations of Sol-gel Prepared Ba_1-xSr_xTiO₃ Nanoceramics

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Effect of ionic radii on the Curie temperature in Ba1-x-ySrxCayTiO3 compounds

Cited by 27 publications

References 61 publications

Phase evolution and electrical behaviour of samarium-substituted bismuth ferrite ceramics

Phase evolution and electrical behaviour of samarium-substituted bismuth ferrite ceramics

Exploiting Ionic Radii for Rational Design of Halide Perovskites

Structural, Dielectric and Ferroelectric Characterizations of Sol-gel Prepared Ba1-xSrxTiO3 Nanoceramics

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Product

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Structural, Dielectric and Ferroelectric Characterizations of Sol-gel Prepared Ba_1-xSr_xTiO₃ Nanoceramics