Lattice vibrations of ABi2Nb2O9 crystals (A=Ca, Sr, Ba)

Gupta, H.C.; Archana, .; Luthra, Vandna

doi:10.1016/j.vibspec.2011.03.002

Cited by 34 publications

(11 citation statements)

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“…Solid solutions with high concentrations of Nb (x = 0.9) are characterized by the presence of an extra band at 845 cm −1 which corresponds to vibrations of the Nb-O group [15]. The absence of asymmetrical valence vibrations for x ≥ 0.4 results from initial structural distortion as was shown in Ref.…”

Section: Crystal Structure and Thermal Characteristics Of Binbvoxsupporting

confidence: 53%

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Structure, thermal stability and electrical conductivity of BINBVOX

et al. 2013

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Materials based on BINBVOX compounds that are stable within wide concentration and temperature ranges have been synthesized. Refinement of the crystal structure of different BINBVOX modifications obtained at different temperatures and partial oxygen pressures has been carried out. The most promising solid solutions have been identified according to the linear dependence of the total electric conductivity on temperature and its independence on partial oxygen pressure.

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Section: Crystal Structure and Thermal Characteristics Of Binbvoxsupporting

confidence: 53%

“…Solid State Ionics 243 (2013) [8][9][10][11][12][13][14][15][16][17] The present work involves the synthesis, the crystal structure, the thermal stability and the electrical conductivity of the Bi 4 V 2 -x Nb x O 11 solid solution within a wide range of thermodynamical parameters.…”

Section: Introductionmentioning

confidence: 99%

Structure, thermal stability and electrical conductivity of BINBVOX

et al. 2013

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“…It suggests that Nd substitution could induce a reduction in orthorhombicity distortion. The mode at 436 cm –1 exhibits a remarkable high-frequency shift, which is completely dominated by the Bi–O3 force constant . Since the modes at 570 and 819 cm –1 are related to the stretching of the O–Nb octahedral chain between two (Bi 2 O 2 ) 2+ layers, , no frequency shift for them implies that the B-site Nb 5+ is not involved in Nd 3+ substitution.…”

Section: Results and Discussionmentioning

confidence: 99%

Structure, Phase Transition Behaviors and Electrical Properties of Nd Substituted Aurivillius Polycrystallines Na_0.5Nd_xBi_2.5–xNb₂O₉(x= 0.1, 0.2, 0.3, and 0.5)

2013

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New high temperature Aurivillius piezoelectrics Na0.5Nd(x)Bi(2.5-x)Nb2O9 (NDBNx, x = 0.1, 0.2, 0.3, and 0.5) with Nd substitution for Bi at the A site were synthesized using a solid state reaction process. Crystal structures of NDBN0.2 and NDBN0.5 were refined with the Rietveld method with powder X-ray diffraction, and they crystallized in the orthorhombic space group A21am [a = 5.48558(8) Å, b = 5.46326(9) Å, c = 24.8940(4) Å, and Z = 4 for NDBN0.2 and a = 5.46872(5) Å, b = 5.46730(5) Å, c = 24.80723(25) Å, and Z = 4 for NDBN0.5], at room temperature. The refinement results and Raman spectroscopy of NDBNx verified that Nd occupied both the A site in the perovskite layers and the cation site in the (Bi2O2)(2+) layers. The Nd substitution induced an enhancement in cation disordering between the A site and the (Bi2O2)(2+) layer and an increase in the degree of the relaxation behavior for NDBNx. The ferroelectric to paraelectric phase transition temperature (Tc) of NDBNx ranged from 735 to 764 °C. Furthermore, the isovalent substitution of Nd for Bi had a great influence on microstructure (grain size and shape), defect concentration (mainly oxygen vacancies), preferred grain orientation (texture), and distortion of the octahedron. The coaction between these effects determined the structure characteristics, phase transition behaviors, and electrical properties of NDBNx.

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“…The former could be activated by the distortion of NbO 6 octahedra and the latter is completely dominated by the Bi-O3 force constant. 35,36 Since the modes at 577 and 819 cm 21 are related to the stretching of the O-Nb octahedral chain between two (Bi 2 O 2 ) 2+ layers, 33,34,37 no frequency shift for NLBN implies that Nb 5+ is not involved in La 3+ substitution. With introducing W 6+ , the spectra of NLBN-W-0.02 and NLBN-W-0.05 nearly keep the same as that of the NLBN, except for the mode at 819 cm 21 slightly shifting to a higher frequency.…”

Section: Resultsmentioning

confidence: 99%

Effect of lanthanum and tungsten co-substitution on the structure and properties of new Aurivillius oxides Na0.5La0.5Bi2Nb2-xWxO9

Long

Fan

et al. 2012

CrystEngComm

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Lattice vibrations of ABi2Nb2O9 crystals (A=Ca, Sr, Ba)

Cited by 34 publications

References 31 publications

Structure, thermal stability and electrical conductivity of BINBVOX

Structure, thermal stability and electrical conductivity of BINBVOX

Structure, Phase Transition Behaviors and Electrical Properties of Nd Substituted Aurivillius Polycrystallines Na_0.5Nd_xBi_2.5–xNb₂O₉(x= 0.1, 0.2, 0.3, and 0.5)

Effect of lanthanum and tungsten co-substitution on the structure and properties of new Aurivillius oxides Na0.5La0.5Bi2Nb2-xWxO9

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Lattice vibrations of ABi2Nb2O9 crystals (A=Ca, Sr, Ba)

Cited by 34 publications

References 31 publications

Structure, thermal stability and electrical conductivity of BINBVOX

Structure, thermal stability and electrical conductivity of BINBVOX

Structure, Phase Transition Behaviors and Electrical Properties of Nd Substituted Aurivillius Polycrystallines Na0.5NdxBi2.5–xNb2O9(x= 0.1, 0.2, 0.3, and 0.5)

Effect of lanthanum and tungsten co-substitution on the structure and properties of new Aurivillius oxides Na0.5La0.5Bi2Nb2-xWxO9

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Structure, Phase Transition Behaviors and Electrical Properties of Nd Substituted Aurivillius Polycrystallines Na_0.5Nd_xBi_2.5–xNb₂O₉(x= 0.1, 0.2, 0.3, and 0.5)