Vibrational spectra of MII3Pb(P2O7)2 (MII = Ni, Co)

Santha, N.; Nayar, V. U.; Keresztury, Gábor

doi:10.1016/0584-8539(93)80260-h

Cited by 38 publications

(18 citation statements)

References 13 publications

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“…3, whereas their band assignments are summarized in Table 1. The assignment of the observed spectral features of different entities is based on a comparison with structurally related materials [12][13][14]. The principal bands are assigned to the internal modes of [P 2 O 7 ] group: Two bands are observed at 1,176 and 1,086 cm −1 , which were assigned, respectively, to the ν as (PO 3 ) and ν s (PO 3 ) modes.…”

Section: Infrared Absorption Spectroscopymentioning

confidence: 99%

Dielectric relaxation and ionic conductivity studies of Ag2ZnP2O7

Rhaiem

Chouaib

Guidara

2009

Ionics

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The complex impedance of the Ag 2 ZnP 2 O 7 compound has been investigated in the temperature range 419-557 K and in the frequency range 200 Hz-5 MHz. The Z′ and Z′ versus frequency plots are well fitted to an equivalent circuit model. Dielectric data were analyzed using complex electrical modulus M* for the sample at various temperatures. The modulus plot can be characterized by full width at half-height or in terms of a non-exponential decay function f t ð Þ ¼ exp Àt=t ð Þ b . The frequency dependence of the conductivity is interpreted in terms of Jonscher's law: s w ð Þ ¼ s dc þ Aw n . The conductivity σ dc follows the Arrhenius relation. The near value of activation energies obtained from the analysis of M″, conductivity data, and equivalent circuit confirms that the transport is through ion hopping mechanism dominated by the motion of the Ag + ions in the structure of the investigated material.

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Section: Infrared Absorption Spectroscopymentioning

confidence: 99%

Dielectric relaxation and ionic conductivity studies of Ag2ZnP2O7

Rhaiem

Chouaib

Guidara

2009

Ionics

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“…According to Santha and Nayar, 22 the bridge deformation of υPOP occurs around 300 cm 1 . Hence the peaks observed at 325 and 295 cm 1 in the Raman spectrum of TlDyP 2 O 7 are due to the υPOP bridge deformation with A g C B g symmetry species.…”

Section: Pop Bridge Deformation Torsional and External Modesmentioning

confidence: 99%

Structure and vibrational spectra of double diphosphates TlLnP₂O₇ (Ln = Dy, Ho, Y, Er, Yb)

Khay

Ennaciri

Rulmont

2001

J Raman Spectroscopy

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The new thallium double diphosphates TlLnP 2 O 7 (Ln = Dy, Ho, Y, Er, Yb) were synthesized via solid-state reaction and investigated by x-ray diffraction and vibrational spectroscopy. The x-ray diffraction patterns of these compounds were indexed in the monoclinic system and their unit cell parameters were determined. The infrared and Raman spectra of these compounds were measured and interpreted using factor group analysis. The non-coincidences observed between most infrared and Raman bands are consistent with a centrosymmetric structure for these compounds. The vibrational spectra point to a bent POP bridge angle in all these materials and their values were estimated. The slight shift of the wavenumbers of n as POP and n s POP in the vibrational spectra is due to the influence of Ln 3+ on the POP bridge. The spectroscopic results were used to calculate the main characteristics of the P -O bonds (force constants, bond orders and interatomic distances).

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“…Although several collections of IR and Raman spectra of borate and phosphate compounds have been published (6)(7)(8)(9)(10), no vibrational spectra investigation or rare earth borophosphate compounds has been carried out. In order to separate the internal modes of BO triangles and PO tetrahedra and to propose a detailed interpretation of the spectra, the borate isotopic B* species of La O (BO ) (PO ) is synthesized and its vibrational spectra are investigated.…”

Section: Introductionmentioning

confidence: 99%

X-Ray Powder Diffraction and Vibrational Spectra Studies of Rare Earth Borophosphates,Ln7O6(BO3)(PO4)2(Ln=La, Nd, Gd, and Dy)

Shi

Liang

Zhang

et al. 1997

Journal of Solid State Chemistry

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Vibrational spectra of MII3Pb(P2O7)2 (MII = Ni, Co)

Cited by 38 publications

References 13 publications

Dielectric relaxation and ionic conductivity studies of Ag2ZnP2O7

Dielectric relaxation and ionic conductivity studies of Ag2ZnP2O7

Structure and vibrational spectra of double diphosphates TlLnP₂O₇ (Ln = Dy, Ho, Y, Er, Yb)

X-Ray Powder Diffraction and Vibrational Spectra Studies of Rare Earth Borophosphates,Ln7O6(BO3)(PO4)2(Ln=La, Nd, Gd, and Dy)

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Vibrational spectra of MII3Pb(P2O7)2 (MII = Ni, Co)

Cited by 38 publications

References 13 publications

Dielectric relaxation and ionic conductivity studies of Ag2ZnP2O7

Dielectric relaxation and ionic conductivity studies of Ag2ZnP2O7

Structure and vibrational spectra of double diphosphates TlLnP2O7 (Ln = Dy, Ho, Y, Er, Yb)

X-Ray Powder Diffraction and Vibrational Spectra Studies of Rare Earth Borophosphates,Ln7O6(BO3)(PO4)2(Ln=La, Nd, Gd, and Dy)

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Structure and vibrational spectra of double diphosphates TlLnP₂O₇ (Ln = Dy, Ho, Y, Er, Yb)