Ordering in BaMg1/3Ta1/3Nb1/3O3 ceramics: An X-ray Rietveld analysis

Janaswamy, Srinivas; Murthy, G. Sreenivasa; Dias, Edgar; Murthy, V. R. K.

doi:10.1134/s106377450602009x

Cited by 3 publications

(4 citation statements)

References 33 publications

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“…1(a)] of the as-prepared sample can be indexed as a hexagonal P-3m1 structure with a = b = 5.7550(5) Å and c = 7.0656(2) Å as reported previously [19], which belongs to the trigonal space group. The 1:2 ordering of the B site ions (-Ni-Nb-Nb-) in this structure has been confirmed by two evidences: (i) the appearance of low intensity Bragg peaks in the XRD pattern related to the ordering structure [20], such as the (112) and (103) peaks [inset of Fig. 1(a)] and (ii) the high angle annular dark field (HAADF) Z-contrast image from scanning transmission electron microscopy (STEM) [Figs.…”

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confidence: 56%

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Successive Magnetic Phase Transitions and Multiferroicity in the Spin-One Triangular-Lattice AntiferromagnetBa3NiNb2O9

Hwang

Choi

et al. 2012

Phys. Rev. Lett.

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We report the magnetic and electric properties of Ba3NiNb2O9, which is a quasi-two-dimensional spin-one triangular-lattice antiferromagnet with trigonal structure. At low T and with increasing magnetic field, the system evolves from a 120 degree magnetic ordering phase (A phase) to an up-up-down (uud) phase (B phase) with a change of slope at 1/3 of the saturation magnetization, and then to an "oblique" phase (C phase). Accordingly, the ferroelectricity switches on at each phase boundary with appearance of spontaneous polarization. Therefore, Ba3NiNb2O9 is a unique triangular-lattice antiferromagnet exhibiting both uud phase and multiferroicity.

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confidence: 56%

“…The 1:2 ordering of the B site ions (-Ni-Nb-Nb-) in this structure has been confirmed by two evidences: (i) the appearance of low intensity Bragg peaks in the XRD pattern related to the ordering structure [20], such as the (112) due to their atomic number Z difference [21,22]. No defects are seen on the Ni or Nb sites.…”

supporting

confidence: 50%

Successive Magnetic Phase Transitions and Multiferroicity in the Spin-One Triangular-Lattice AntiferromagnetBa3NiNb2O9

Hwang

Choi

et al. 2012

Phys. Rev. Lett.

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“…distortion from the normal hexagonal cell to the monoclinic phase with antiphase tilting of the oxygen octahedron. The octahedral distortion is caused by the asymmetry of the O bonding network and cooperated by the second‐order Jahn–Teller deformation of the d 0 Nb 5+ and Ta 5+ cations [31], i.e. the local symmetry decreases with increasing Ts, and the Raman mode number increases accordingly with the decrease in the intensities of the splitting peaks, which are also proved in BS 32 ZN ceramics [94].…”

Section: Raman Phonon Mode Characteristics Of Mwdcsmentioning

confidence: 99%

“…Another description is in terms of the close packing of A and O ions such that the AO 3 layers are stacked one over the other. Thus, when the stacking of the AO 3 layers is cubic, the B cation octahedral sharing all corners can form the ideal perovskite structure [31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

Lattice dynamics and phonon characteristics of complex perovskite microwave ceramics

Shi

Dong

Zhou

et al. 2018

IET Nanodielectrics

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Complex perovskite microwave dielectric ceramics (MWDCs) of A(B 1/3 ′ B 2/3 ′′)O 3-type (A = Ba, Sr,…; B = Mg, Zn,…; B = Nb, Ta), which exhibit excellent dielectric properties, have currently been widely used in microwave and millimetre wave devices. Vibrational spectra, including both Raman and far-infrared (FIR) spectra, are powerful tools to investigate the atomic thermal vibrational properties of MWDCs and reveal the intrinsic origin of dielectric properties. In this review, lattice dynamics and phonon characteristics of the A(B 1/3 ′ B 2/3 ′′)O 3-type MWDCs are summarised and presented in detail to introduce remarkable progress in this field and make a guide for the design of novel advanced MWDCs. The atomic sites and the corresponding modes in Raman and FIR spectra are identified and illuminated. The effects of the processing conditions and the ordered superstructures in the nanoscale region on vibrational modes are summarised systemically. Intrinsic properties can be extrapolated from the fitting results of FIR spectroscopy, which were also discussed based on the Kramers-Krönig relations, Lorentz three-parameter classical model and four-parameter semi-quantum model. The correlations between vibrational modes (phonons), crystal structures, and dielectric properties are created, which can help to build the mathematical models so as to understand the structure-property relationship of MWDCs better.

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Structure analysis on the Ba3Mg(Ta1−xNbx)2O9 ceramics: Coexistence of order and disorder

Janaswamy

Murthy

Dias

et al. 2008

Materials Research Bulletin

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Ordering in BaMg1/3Ta1/3Nb1/3O3 ceramics: An X-ray Rietveld analysis

Cited by 3 publications

References 33 publications

Successive Magnetic Phase Transitions and Multiferroicity in the Spin-One Triangular-Lattice AntiferromagnetBa3NiNb2O9

Successive Magnetic Phase Transitions and Multiferroicity in the Spin-One Triangular-Lattice AntiferromagnetBa3NiNb2O9

Lattice dynamics and phonon characteristics of complex perovskite microwave ceramics

Structure analysis on the Ba3Mg(Ta1−xNbx)2O9 ceramics: Coexistence of order and disorder

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