Barium strontium titanate-based perovskite materials for microwave applications

Ioachim, A.; Toacsǎn, M.I.; Banciu, M.G.; Nedelcu, L.; Vasiliu, F.; Alexandru, H.V.; Berbecaru, C.; Stoica, G.

doi:10.1016/j.progsolidstchem.2007.01.017

Cited by 81 publications

(30 citation statements)

References 13 publications

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“…Many studies have been carried out concerning the Ba/Sr ratio effect, on the optical properties [5][6][7][8], on nanomechanical characteristics [9], on the electrical properties [10][11] or dielectric properties at low frequencies [12] and microwave frequencies [13][14][15].…”

Section: -Introductionmentioning

confidence: 99%

Systematic investigation of the annealing temperature and composition effects on the dielectric properties of sol–gel BaxSr1−xTiO3 thin films

Levasseur

El-Shaarawi

Pacchini

et al. 2013

Journal of the European Ceramic Society

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Section: -Introductionmentioning

confidence: 99%

Systematic investigation of the annealing temperature and composition effects on the dielectric properties of sol–gel BaxSr1−xTiO3 thin films

Levasseur

El-Shaarawi

Pacchini

et al. 2013

Journal of the European Ceramic Society

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“…It is then assured that the BST crystal structure of x=0 and x=0.3 compositions was tetragonal while that of x=0.7 was a cubic structure. Previous research has reported (Ioachim et al, 2007) that the substitution of Sr 2+ into Ba 2+ in a large fraction resulted in a distortion in the tetragonal system. Hence, the phase transformation from tetragonal to cubic takes place followed by a decrease in a tetragonal lattice.…”

Section: Experimental Methodsmentioning

confidence: 98%

Exploring the Effect of Particle Concentration and Irradiation Time in the Synthesis of Barium Strontium Titanate (BST) Ba(1-X)SrxTiO3 (X:0-1) Nanoparticles by High Power Ultrasonic Irradiation

Yustanti¹,

Hafizah²,

Manaf³

2016

IJTech

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Barium strontium titanate (BST) or Ba 1-x Sr x TiO 3 with x=0-1 possesses superior dielectric properties, which are widely used in many applications like in communication technology, electronic instrumentations, and various electrical devices. In this paper, the characterization of the particle and crystallite size of Ba 1-x Sr x TiO 3 (x: 0; 0.3; 0.7) is described. A two-step refinement commenced: first by mechanical milling, and then a further refinement under ultrasonic irradiation in a high power sonicator was applied to Ba 1-x Sr x TiO 3 (x: 0; 0.3; 0.7) particles. The crystalline powders were obtained through mechanically alloyed standard research grade BaCO 3 , TiO 2 , and SrCO 3 precursors in a planetary ball mill.The powders were first found heavily deformed after 60 hours of milling and then went through a sintering process at 1200°C for 4 hours to form multicrystallite particles. The presence of a single phase in the three samples was solidly confirmed in their respective X-ray diffraction (XRD) patterns. The changes of multicrystallite particles into monocrystallite particles were obtained only after crystalline powders were irradiated ultrasonically in a high power sonicator. The processing variable during ultrasonic irradiation was limited to the duration time of irradiation and particle concentration in the exposed media. It is shown that the average sizes of BST particles at x=0; 0.3; 0.7 before ultrasonic irradiation were 353, 348, and 385 nm, respectively. These respective sizes decreased drastically to 52, 35, and 49 nm, respectively, after 12 hours of ultrasonic irradiation. These particle sizes are almost identical with that of their crystallite size. Hence, the synthesis of monocrystallite particles has been achieved. As the particle concentration of media takes effect, it is shown that an exposed media with a higher particle concentration tends to form multicrystallite particles.

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“…Dielectrics and ferroelectrics have taken a renewed interest in the last two decades and have been the subject of renewed attention of many researchers, especially for potential applications in various industrial equipment capacitors, microwave resonators and filters, telecommunications technologies, oxygen sensors, anodes for fuel cells (SOFC), etc [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Structural and Dielectric Properties of La0.33Sr0.67M0.33Ti0.67O3±δ (M = Mn or Fe) Perovskites

Tlili

Hcini

Triki

et al. 2015

J Supercond Nov Magn

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We have investigated the structural and dielectric properties of La 0.33 Sr 0.67 Mn 0.33 Ti 0.67 O 3+δ (LSMTO) and La 0.33 Sr 0.67 Fe 0.33 Ti 0.67 O 3−δ (LSFTO) perovskites synthesized by the solid-state reaction method at 1500 • C Rietveld analysis of X-ray diffraction (XRD) data shows pure crystalline phase with cubic P m3m structure, with no change in the unit cell volume due to the same ionic radii of Fe 3+ and Mn 3+ . Scanning electron microscopy (SEM) micrographs show that the average grain size is slightly larger for LSMTO than for LSFTO. The electrical response of samples was studied at room temperature using the impedance spectroscopy technique over a broad frequency range (0.1Hz1MHz). The conductivity curves for the two samples were well fitted by the Jonscher law. For the LSFTO sample the hopping process occurs at long distance whereas for LSMTO compound, it occurs between neighboring sites. Variation of the dielectric parameter (ε ) and that of the loss factor (ε ) for both samples were explained by the different polarization and conductivity mechanisms. For both compounds, the variation of the imaginary part Z? shows a peak at a relaxation frequency (f r ) related to the relaxation time (τ ) by τ = 1/2πf r . Cole-Cole plots of Sobhi Hcini hcini sobhi@yahoo.fr impedance show the presence of two semicircles for LSMTO sample, whereas LSFTO compound shows one semicircle. To explain the impedance results, an appropriate electrical equivalent circuit has been proposed for each sample.

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Barium strontium titanate-based perovskite materials for microwave applications

Cited by 81 publications

References 13 publications

Systematic investigation of the annealing temperature and composition effects on the dielectric properties of sol–gel BaxSr1−xTiO3 thin films

Systematic investigation of the annealing temperature and composition effects on the dielectric properties of sol–gel BaxSr1−xTiO3 thin films

Exploring the Effect of Particle Concentration and Irradiation Time in the Synthesis of Barium Strontium Titanate (BST) Ba(1-X)SrxTiO3 (X:0-1) Nanoparticles by High Power Ultrasonic Irradiation

Structural and Dielectric Properties of La0.33Sr0.67M0.33Ti0.67O3±δ (M = Mn or Fe) Perovskites

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