Oxides ferroelectric (Ba, Sr)TiO3 for microwave devices

Alexandru, H.V.; Berbecaru, C.; Ioachim, A.; Toacsen, M.I.; Banciu, M.G.; Nedelcu, L.; Ghetu, D.

doi:10.1016/j.mseb.2003.10.034

Cited by 61 publications

(36 citation statements)

References 4 publications

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“…Barium strontium titanate (BST) has been widely studied due to its potential application in electronic ceramics field [1][2][3][4], especially in tunable microwave devices [5,6]. However, the relatively high dielectric loss and large temperature dependence are problems for BST ceramics.…”

Section: Introductionmentioning

confidence: 99%

Dielectric properties of (Ba1-2x Sr x Ca x )TiO3 ferroelectric ceramics

Yun

Wang

2007

J Electroceram

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Ferroelectric ceramics of (Ba 1−2x Sr x Ca x )TiO 3 (0≤x≤0.30) were prepared by a routine solid-state reaction technique. Co-substitution of Sr 2+ and Ca 2+ for Ba 2+ with equal mole in BaTiO 3 restrain the maximal dielectric constant K m strongly when 0.2≥x>0. However, composition (Ba 0.4 Sr 0.3 Ca 0.3 )TiO 3 shows the higher maximal dielectric constant. With increasing Sr and Ca content x, temperature T m of the maximal dielectric constant K m shifts to low temperature and all selected compositions for study exhibit a broad phase transition temperature range. The composition (Ba 0.4 Sr 0.3 Ca 0.3 )TiO 3 presents characteristics of ferroelectric relaxor, value of K m decreases and temperature T m increases with increasing frequency.

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Section: Introductionmentioning

confidence: 99%

Dielectric properties of (Ba1-2x Sr x Ca x )TiO3 ferroelectric ceramics

Yun

Wang

2007

J Electroceram

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“…The plots show that the dielectric constant of all four samples decreases with increasing frequency. This is the general behavior of the dielectrics and is termed as "frequency dispersion" [11,12]. This behavior is attributed to the justification given in MaxwellWagner interfacial model [13].…”

Section: Electrical Measurementsmentioning

confidence: 97%

Frequency and temperature dependence of dielectric and electric properties of Ba_2-xSm_4+2x/3Ti₈O₂₄ with structural analysis

Narang

Kaur

Pubby

2015

Materials Science-Poland

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Dielectric ceramics samples of barium titanium oxide doped with samarium, having a complex structural formula of Ba 2−x Sm 4+2x/3 Ti 8 O 24 (referred to as BST), were fabricated by a high temperature solid-state reaction technique with varying x (0.0, 0.2, 0.4, 0.6). X-ray diffraction technique was used to check the formation of particular phases. Scanning electron microscope technique was used to study the surface morphology of the samples. The samples were studied in a temperature range of 298 K to 623 K and frequency range of 10 KHz to 1 MHz. The dielectric constant (ε r ), loss tangent (tanδ), and AC conductivity (σ AC ) were measured on sintered disks of BST samples. The DC resistivity of different compositions was measured at room temperature. Detailed studies of dielectric and electrical properties showed that these properties are strongly dependent on composition, frequency and temperature. The compounds showed stable behavior in lower temperature range (up to 523 K), therefore, they can be used in practical applications in this temperature range.

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“…Isovalent dopants, such as strontium or lead, have been employed to lower or raise the Curie point for particular microwave applications such as phase shifters, tunable filters, delay lines, and tunable oscillators [23][24][25][26]. Using niobium oxide in few percent, in the system Ba(Ti,Nb)O 3 , caused a severe decrease in Curie temperature and raised the tetragonal-orthorhombic and orthorhombic-rhombic transition points.…”

Section: Introductionmentioning

confidence: 99%

Structural and mechanical properties characterization of barium strontium titanate (BST) ceramics

et al. 2011

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Ba (1-x) Sr (x) TiO 3 ceramics, where x=0.05, 0.10, 0.15, and 0.20, were prepared by solid state reaction technique. X-ray diffraction analysis confirmed the formation of single phase perovskite structures. Mechanical properties such as ultrasonic attenuation, longitudinal wave velocity, and longitudinal elastic modulus were studied by an ultrasonic pulse echo technique at 2 MHz. Investigations of ceramic microstructures and mechanical properties showed its dependence on composition and sintering time. Increasing of Sr content, x, resulted in a decrease in bulk density and ultrasonic attenuation and an increase in velocity and modulus. Also, size of crystallites and c/a ratio were found to decrease with increasing of x, and increased with increasing of sintering time. High temperature ultrasonic studies showed, in addition to Curie phase transition, two relaxation peaks and its origin was investigated. The acquired structural and mechanical results were correlated and discussed.

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Oxides ferroelectric (Ba, Sr)TiO3 for microwave devices

Cited by 61 publications

References 4 publications

Dielectric properties of (Ba1-2x Sr x Ca x )TiO3 ferroelectric ceramics

Dielectric properties of (Ba1-2x Sr x Ca x )TiO3 ferroelectric ceramics

Frequency and temperature dependence of dielectric and electric properties of Ba_2-xSm_4+2x/3Ti₈O₂₄ with structural analysis

Structural and mechanical properties characterization of barium strontium titanate (BST) ceramics

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Oxides ferroelectric (Ba, Sr)TiO3 for microwave devices

Cited by 61 publications

References 4 publications

Dielectric properties of (Ba1-2x Sr x Ca x )TiO3 ferroelectric ceramics

Dielectric properties of (Ba1-2x Sr x Ca x )TiO3 ferroelectric ceramics

Frequency and temperature dependence of dielectric and electric properties of Ba2-xSm4+2x/3Ti8O24 with structural analysis

Structural and mechanical properties characterization of barium strontium titanate (BST) ceramics

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Frequency and temperature dependence of dielectric and electric properties of Ba_2-xSm_4+2x/3Ti₈O₂₄ with structural analysis