Preparation and properties of Ba2−xSrxSmTaO6 (x=0–2): a group of new perovskite materials

James, J.; Sankar, Meena; Kumar, S. Senthil; Nair, K.V.O.

doi:10.1016/j.matchemphys.2003.10.007

Cited by 10 publications

(8 citation statements)

References 15 publications

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“…The lattice constants for SST are a = 5.826 Å, b = 5.900 Å, c = 8.281 Å, and β = 90.162° and that for CST are a = 5.570 Å, b = 5.831 Å, c = 8.081 Å, and β = 89.737°. These values agree well with the earlier reported values for BST, SST, and CST . The structural data obtained from Rietveld refinement are given in Table .…”

Section: Resultssupporting

confidence: 90%

“…The temperature was controlled by an Eurotherm 2216e programmable temperature controller connected with the oven. The complex impedance Z* (= Z 0 ÀiZ″ = 1/ixC 0 e*) complex electric modulus M* (= 1/ e*) and the ac electrical conductivity r (= xe 0 e″) were obtained from the temperature dependence of the real (e 0 ) and imaginary (e″) components of the complex dielectric constant e* (= e 0 Àie″) 18 SST, 17 and CST. 8 The structural data obtained from Rietveld refinement are given in Table I.…”

Section: Methodsmentioning

confidence: 99%

“…There exists considerable debate concerning the crystal structure of BST. James et al 18 have confirmed the cubic perovskite structure of BST. However, Korchagina et al have reported monoclinic structure of it.…”

Section: Introductionmentioning

confidence: 91%

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Dielectric Relaxation and Collective Vibrational Modes of Double‐Perovskites A₂SmTaO₆ (A = Ba, Sr and Ca)

2014

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The crystal structures of the double‐perovskite oxide A2SmTaO6 series (AST, A = Ba, Sr, Ca) synthesized by solid‐state reaction technique are determined from X‐ray powder diffraction data. Rietveld refinements of the X‐ray diffraction data of the samples show that Ba2SmTaO6 (BST) crystallizes in cubic phase and Sr2SmTaO6 (SST) and Ca2SmTaO6 (CST) crystallize in monoclinic phase. Fourier transform infrared spectra show two primary modes of the samples at around 370 and 600 cm−1. The vibrational properties of the samples are studied by Raman spectroscopy taken at 488‐nm wavelength. Group‐theoretical study is performed to assign the different vibrational modes of the samples in accordance with structural symmetry. The observed shifts of some vibrations in the SST and CST w.r.t. BST upon changing the A cation are tentatively explained. Dielectric spectroscopy is applied to investigate the ac electrical conductivity of AST in different temperatures between 303 and 673 K and in a frequency range of 42 Hz–1 MHz. The complex impedance plane plots show that the relaxation (conduction) mechanism in these materials is purely a bulk effect arising from the semiconductive grains. The relaxation mechanism of the samples is modeled by Cole–Cole equation. The frequency‐dependent conductivity spectra are found to follow the power law.

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Section: Resultssupporting

confidence: 90%

Section: Methodsmentioning

confidence: 99%

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Dielectric Relaxation and Collective Vibrational Modes of Double‐Perovskites A₂SmTaO₆ (A = Ba, Sr and Ca)

2014

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“…2. The XRD patterns of Sr(B′ 1/2 Nb 1/2 )O 3 ceramics with B′=Sm, Eu, Gd, Tb, Dy, and Ho are comparable with that of Sr(Sm 1/2 Ta 1/2 ) O 3 22 , which have a tetragonal structure with space group I 4/ m . It is found that the (200) peak is absent in Gd‐based ceramic, whereas it is present in Tb‐, Eu‐, and Sm‐based ceramics.…”

Section: Discussion Of the Resultsmentioning

confidence: 77%

Microwave Dielectric Properties of Sr(B′_1/2Nb_1/2)O₃ [B′=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Yb, and In] Ceramics

Khalam

Sebastian

2006

Int J Applied Ceramic Tech

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Sr(B′1/2Nb1/2)O3 [B′=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Yb, and In] ceramics were prepared by the conventional solid‐state ceramic route. The crystal structure and microstructure of the ceramics were characterized by X‐ray diffraction and scanning electron microscopic methods, and the dielectric properties were measured in the microwave range. Addition of a small amount of CeO2 as a sintering aid improved the densification and dielectric properties of the ceramics. The effects of cation substitution and glass addition on the microwave dielectric properties of the ceramics were also investigated. Glass addition resulted in the lowering of the processing temperature of the materials without much affecting the dielectric properties, whereas cation substitution resulted in the variation of the temperature coefficient of resonant frequencies. A correlation of dielectric properties with the tolerance factor and ionic radii of B′‐site elements of the ceramics has been observed.

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“…Several such complex ceramic oxides with the general formula Ba 2 MM 0 O 6+x , where M=Y, La or any of the rare-earth metals; M 0 =Sb, Sn, Nb, Zr, Hf and Ta and À0.5oxo0.5 were synthesized and characterized recently. Some compounds with the formula Sr 2 MM 0 O 6+x are also reported [1][2][3][4][5]. These compounds crystallize in the perovskite structure.…”

Section: Introductionmentioning

confidence: 99%

Mg2MTaO6 (M=Nd or La): a group of new pyrochlore oxides

Kumar

Nair

James

2004

Journal of Solid State Chemistry

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Preparation and properties of Ba2−xSrxSmTaO6 (x=0–2): a group of new perovskite materials

Cited by 10 publications

References 15 publications

Dielectric Relaxation and Collective Vibrational Modes of Double‐Perovskites A₂SmTaO₆ (A = Ba, Sr and Ca)

Dielectric Relaxation and Collective Vibrational Modes of Double‐Perovskites A₂SmTaO₆ (A = Ba, Sr and Ca)

Microwave Dielectric Properties of Sr(B′_1/2Nb_1/2)O₃ [B′=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Yb, and In] Ceramics

Mg2MTaO6 (M=Nd or La): a group of new pyrochlore oxides

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Preparation and properties of Ba2−xSrxSmTaO6 (x=0–2): a group of new perovskite materials

Cited by 10 publications

References 15 publications

Dielectric Relaxation and Collective Vibrational Modes of Double‐Perovskites A2SmTaO6 (A = Ba, Sr and Ca)

Dielectric Relaxation and Collective Vibrational Modes of Double‐Perovskites A2SmTaO6 (A = Ba, Sr and Ca)

Microwave Dielectric Properties of Sr(B′1/2Nb1/2)O3 [B′=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Yb, and In] Ceramics

Mg2MTaO6 (M=Nd or La): a group of new pyrochlore oxides

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Dielectric Relaxation and Collective Vibrational Modes of Double‐Perovskites A₂SmTaO₆ (A = Ba, Sr and Ca)

Dielectric Relaxation and Collective Vibrational Modes of Double‐Perovskites A₂SmTaO₆ (A = Ba, Sr and Ca)

Microwave Dielectric Properties of Sr(B′_1/2Nb_1/2)O₃ [B′=La, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Yb, and In] Ceramics