Ferroelectric properties of tungsten bronze ceramics

Bhanumathi, A.; Murty, S. Narayana; Umakantham, K.; Mouli, K. Chandra; Padmavathi, G.; Rao, K. Tirumala; Syamalamba, V.

doi:10.1080/00150199008221476

Cited by 24 publications

(11 citation statements)

References 6 publications

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“…The temperature coefficient of the dielectric constant ( ε ) at 1 MHz is −2128 ppm/ • C. In combination with Sr 4 Sm 2 Ti 4 Ta 6 O 30 with T C around 30 • C [16], it is found that the T C of Sr 4 M 2 Ti 4 Ta 6 O 30 (M = Pr, Sm and Eu) decreases with the increase of the ionic radius of the M 3+ ion, and these results agree with the work of Bhanumathi et al [23]. Since SPTT has a negative and SETT has a positive temperature coefficient of permittivity at room temperature, heterogeneous mixtures of SPTT and SETT or a solid solution between them might be used to manufacture a tungsten bronze-structured temperature-stable dielectrics suitable for multilayer capacitor applications [21].…”

Section: Resultssupporting

confidence: 93%

Characterization and dielectric properties of Sr4M2Ti4Ta6O30 (M=Pr and Eu) ceramics

Fang

Peng

et al. 2010

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 93%

Characterization and dielectric properties of Sr4M2Ti4Ta6O30 (M=Pr and Eu) ceramics

Fang

Peng

et al. 2010

Journal of Alloys and Compounds

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“…The T of Ba 4 SrRTi 3 V 7 O 30 (R=Sm and Dy) decreases as the ionic radius of the R ion decreases, and these results agree well with the results of other compounds of the same family [25,26]. This anomaly may be associated with ferroelectric-paraelectric phase transition, which was confirmed by the appearance of hysteresis loops (as shown in the later section).…”

Section: Dielectric Studysupporting

confidence: 79%

Structural, dielectric, electrical and piezoelectric properties of Ba4SrRTi3V7O30 (R=Sm, Dy) ceramics

Sahoo¹,

Panigrahi²,

Patri³

et al. 2008

Open Physics

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Abstract:Polycrystalline samples of Ba 4 SrRTi 3 V 7 O 30 (R=Sm and Dy), members of the tungsten-bronze family, were prepared using a high-temperature, solid-state reaction technique and studied their electrical properties (using complex impedance spectroscopy) in a wide range of temperature (31-500 • C) and frequency (1 kHz -1 MHz). Preliminary structural (XRD) analyses of these compounds show the formation of single-phase, orthorhombic structures at room temperature. The scanning electron micrographs (SEM) provided information on the quality of the samples and uniform distribution of grains over the entire surface of the samples. Detailed studies of the dielectric properties suggest that they have undergone ferroelectric-paraelectric phase transition well above the room temperatures (i.e., 432 and 355 • C for R= Sm and Dy, respectively, at frequency 100 kHz). Measurements of electrical conductivity (ac and dc) as a function of temperature suggest that the compounds have semiconducting properties much above the room temperature, with negative temperature coefficient of resistance (NTCR) behavior. The existence of ferroelectricity in these compounds was confirmed from a polarization study.

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“…The temperature coefficients of the dielectric constant (s e ) at 1 MHz are À 1610 ppm -C À 1 . The T C of Sr 4 Ln 2 Ti 4 Ta 6 O 30 (Ln = Sm and Nd) decreases as the ionic radius of the Ln ion increases, and these results agree with the work of Bhanumathi et al [21]. In addition, The T C of Sr 4 Sm 2 Ti 4 Ta 6 O 30 is higher compared to that of Sr 5 SmTi 3 Ta 7 O 30 (À 40 -C) [15], and this is similar to the situation in Sr 5 SmTi 3 Nb 7 O 30 (250 -C) and Sr 4 Sm 2 Ti 4 Nb 6 O 30 (370 -C) [5,18].…”

Section: Resultssupporting

confidence: 94%