Effect of Cerium Doping on Microstructure and Dielectric Properties of BaTiO3 Ceramics

Yasmm, Sabina; Choudhury, Subhashree; Hakim, M. A.; Bhuiyan, A.H.; Rahman, Mohammad Jellur

doi:10.1016/s1005-0302(11)60139-4

Cited by 35 publications

(25 citation statements)

References 14 publications

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“…The solid solubility limits of ceria in ST ceramics were expected to be quite small because of the significant difference between the ionic sizes of Sr 2+ ( r Sr 2+ = 1.44 Å) and Ce 4+ ( r Ce 4+ = 0.87 Å). It was reported that, the lower solubility of donor doping like CeO 2 , La 2 O 3 , and Nb 2 O 5 in BaTiO 3 and SrTiO 3 ceramics is primarily due to the formation of core–shell‐structured fine grains and/or layered intergrowth compounds. In contrast to this phenomenon, the decrease in the lattice parameters with the addition of ceria indicated that the lower solubility of ceria in SrTiO 3 is not due to the formation of core–shell‐structured fine grains and/or layered intergrowth compounds.…”

Section: Resultsmentioning

confidence: 99%

Structure and Microwave Dielectric Behavior of A‐Site‐Doped Sr_(1−1.5x)Ce_xTiO₃ Ceramics System

et al. 2016

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The ion valence state, phase composition, microstructure, and microwave dielectric properties of Sr(1−1.5x)CexTiO3 (x = 0.1–0.67, SCT) ceramics were systematically investigated. Sr(1−1.5x)CexTiO3 ceramics were produced with gradual structural evolution from a cubic to a tetragonal and turned to an orthorhombic structure in the range of 0.1 ≤ x ≤ 0.67. Above a critical Ce proportion (x = 0.4), microstructural changes and normal grain growth initially occurred. On the basis of chemical analysis results, the reduction of Ti4+ ions was hastened by tetravalent ions (Ce4+). By contrast, this reduction was inhibited by trivalent ions (Ce3+). The observed dielectric behavior was strongly influenced by phase composition, oxygen vacancies (VnormalO∙∙), and defect dipoles, namely, (Ti′−VO∙∙) and (VSr″−VO∙∙). Temperature stable ceramics sintered at 1350°C for 3 h in air yielded an intermediate value of dielectric constant (εr = 40), with the smallest reported value of temperature coefficient of resonant frequency (τf = +0.9 ppm/°C), and quality factor (Q × f = 5699 GHz) at x = 0.6.

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Section: Resultsmentioning

confidence: 99%

Structure and Microwave Dielectric Behavior of A‐Site‐Doped Sr_(1−1.5x)Ce_xTiO₃ Ceramics System

et al. 2016

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“…Various techniques such as the classical solid-state reaction method [20,31,32], the sol-gel route [33], and the Pechini procedure [21,22,34,35] have been reported for the preparation of Ce 3+ -doped BaTiO 3 ceramics. The "acetate" variant of the sol-gel route is known as an excellent preparation technique for controlling the stoichiometry and microstructure homogeneity of doped BaTiO 3 -based products [33,[36][37][38], so we considered it as adequate for our study.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sintering Strategy on the Characteristics of Sol-Gel Ba1−xCexTi1−x/4O3 Ceramics

et al. 2019

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Single-phase Ce3+-doped BaTiO3 powders described by the nominal formula Ba1−xCexTi1−x/4O3 with x = 0.005 and 0.05 were synthesized by the acetate variant of the sol-gel method. The structural parameters, particle size, and morphology are strongly dependent on the Ce3+ content. From these powders, dense ceramics were prepared by conventional sintering at 1300 °C for 2 h, as well as by spark plasma sintering at 1050 °C for 2 min. For the conventionally sintered ceramics, the XRD data and the dielectric and hysteresis measurements reveal that at room temperature, the specimen with low cerium content (x = 0.005) was in the ferroelectric state, while the samples with significantly higher Ce3+ concentration (x = 0.05) were found to be in the proximity of the ferroelectric–paraelectric phase transition. The sample with low solute content after spark plasma sintering exhibited insulating behavior, with significantly higher values of relative permittivity and dielectric losses over the entire investigated temperature range relative to the conventionally sintered sample of similar composition. The spark-plasma-sintered Ce-BaTiO3 specimen with high solute content (x = 0.05) showed a fine-grained microstructure and an almost temperature-independent colossal dielectric constant which originated from very high interfacial polarization.

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“…For instance, in the tetragonal structure at room temperature, the c lattice parameter is only 1% longer than a. BaTiO 3 has become the most widely used functional advanced ceramic material in ISSN 1600-5767 # 2018 International Union of Crystallography electronics. It finds wide applications in devices such as microphones, ultrasonic and underwater transducers, multilayer ceramic capacitors, and spark generators (Yasmm et al, 2011;Kishi et al, 2003). In addition, it is possible to tailor its properties by chemical substitutions, meeting a greater variety of performance requirements (Acosta et al, 2017;Maiti et al, 2008;Jaffe et al, 1971).…”

Section: Introductionmentioning

confidence: 99%

Local distortion and octahedral tilting in BaCe_xTi_1−xO₃ perovskite

et al. 2018

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Ceramics with perovskite structure and composition BaCe x Ti 1Àx O 3 (x = 0.02-0.30) show a progressive evolution with increasing x, from the long-range polar order of ferroelectric BaTiO 3 to the short-range polar order typical of relaxors. The ionic size mismatch between Ti 4+ and Ce 4+ determines strong local strains which have a significant impact on dielectric properties and phase transitions. The pair distribution function, coupled with transmission electron microscopy analysis, was applied to study the local structure. Because of the inner B-cation sizes, the superposition of rigid B-O octahedra with different volumes is not compatible with the construction of an ideal perovskite structure. In this light, local structure can be described by an original model which allows (i) different Ti-O and Ce-O distances and (ii) the typical distortions of the two end members: off-center displacement of Ti occurring in BaTiO 3 and octahedral tilt in BaCeO 3 . The results show a clear difference, in terms of volumes, between oxygen octahedra with titanium and those related to cerium. In addition, the inclusion of cerium causes a tilt of its oxygen cage, as occurs in pure BaCeO 3 , creating contra-rotations and distortions of the octahedra containing titanium. This complex arrangement entails a substantial distortion, increasing as a function of cerium amount, which strongly influences the directions of titanium displacements, their local correlation and consequently their long-range cooperative effects. Polar order (Canu et al., 2018) BaTi 0.98 Ce 0.02 O 3 (x = 0.02) 150, 270, 350, 450 Ferroelectric BaTi 0.95 Ce 0.05 O 3 (x = 0.05) 200, 350, 380, 420 DPT BaTi 0.9 Ce 0.

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Effect of Cerium Doping on Microstructure and Dielectric Properties of BaTiO3 Ceramics

Cited by 35 publications

References 14 publications

Structure and Microwave Dielectric Behavior of A‐Site‐Doped Sr_(1−1.5x)Ce_xTiO₃ Ceramics System

Structure and Microwave Dielectric Behavior of A‐Site‐Doped Sr_(1−1.5x)Ce_xTiO₃ Ceramics System

Influence of Sintering Strategy on the Characteristics of Sol-Gel Ba1−xCexTi1−x/4O3 Ceramics

Local distortion and octahedral tilting in BaCe_xTi_1−xO₃ perovskite

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Effect of Cerium Doping on Microstructure and Dielectric Properties of BaTiO3 Ceramics

Cited by 35 publications

References 14 publications

Structure and Microwave Dielectric Behavior of A‐Site‐Doped Sr(1−1.5x)CexTiO3 Ceramics System

Structure and Microwave Dielectric Behavior of A‐Site‐Doped Sr(1−1.5x)CexTiO3 Ceramics System

Influence of Sintering Strategy on the Characteristics of Sol-Gel Ba1−xCexTi1−x/4O3 Ceramics

Local distortion and octahedral tilting in BaCe x Ti1−x O3 perovskite

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Structure and Microwave Dielectric Behavior of A‐Site‐Doped Sr_(1−1.5x)Ce_xTiO₃ Ceramics System

Structure and Microwave Dielectric Behavior of A‐Site‐Doped Sr_(1−1.5x)Ce_xTiO₃ Ceramics System

Local distortion and octahedral tilting in BaCe_xTi_1−xO₃ perovskite