Structure and vibrational properties of La2−xBixMo2O9 (0.05⩽x⩽0.4) oxygen ion conductors

Paul, Thierry; Ghosh, A.

doi:10.1016/j.jallcom.2014.06.012

Cited by 24 publications

(16 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has been found that after deconvolution each spectrum consists of vibrational bands at around 340 cm À1 , 405 cm À1 , 800 cm À1 , 860 cm À1 , and 920 cm À1 . It is observed that the number of bands is smaller than that of symmetry predicted (59) 16,31 The bands around 860 and 920 cm À1 are assigned to the symmetrical stretching 1 mode of MoO 4 . 32 The band at around 920 cm À1 is found to be most intense.…”

Section: B Electrical Propertymentioning

confidence: 75%

“…28 The MoO 4 structural group is responsible for the vibrational bands centered at 710 and 790 cm À1 . 16 The observed bands centered around 870 cm À1 and 940 cm À1 are due to the vibration of Mo 2 O 8 tetrahedra. 29 Fig.…”

Section: B Electrical Propertymentioning

confidence: 97%

“…15 Fourier transform infrared and Raman spectra of La 2 Mo 2 O 9 are also presented elsewhere. 16 In this present work, we have investigated the effect of Y substitution on La site for La 2 Mo 2 O 9 on the structure and ion conduction properties. Also a correlation between the structural and ion conduction results has been established.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Correlation of structure and ion conduction in La2−xYxMo2O9 (0 ≤ x ≤ 0.2) oxygen ion conductors

Paul

Ghosh

2015

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

Articles you may be interested inSpontaneous formation of circular and vortex ferroelectric domain structure in hexagonal YMnO3 and YMn0.9Fe0.1O3 prepared by low temperature solution synthesisCorrelation of structure and ion conduction of La 2Àx Y x Mo 2 O 9 (0 x 0.2) has been investigated. The cubic symmetry with space group P2 1 3 and other structural parameters are obtained from Rietveld refinement of X-ray diffraction patterns of Y doped samples. The average lanthanum-oxygen and molybdenum-oxygen distances are obtained from the electron density contour plot. The transmission electron microscopic study confirms the cubic nature of the samples and also provides an estimate of thickness of the grain boundary. The scanning transmission electron microscope energy dispersive spectrometer mapping confirms the different orientations of grains. The composition dependence of the ionic conductivity has been correlated with that of O2 and O3 site occupancies in the [O1La 3 Mo] antitetrahedral unit. The different vibrational modes in the low frequency region due to vibration of Mo-O bands are confirmed from the analysis of FTIR and Raman spectra. The full widths at half maximum of most of the Mo-O bands are found to be independent of Y doping. Additionally, the shifts in the position of Raman bands are correlated with unit cell parameter using Gr€ uneisen constant. V C 2015 AIP Publishing LLC.

show abstract

Section: B Electrical Propertymentioning

confidence: 75%

Section: B Electrical Propertymentioning

confidence: 97%

See 1 more Smart Citation

Correlation of structure and ion conduction in La2−xYxMo2O9 (0 ≤ x ≤ 0.2) oxygen ion conductors

Paul

Ghosh

2015

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…7 To stabilize the b phase of La 2 Mo 2 O 9 at room temperature and also to avail higher ionic conductivity, several alkali, alkaline, and rare earth elements have been doped both in La and Mo sites. [7][8][9][10] The ionic conductivity of polycrystalline materials is influenced by the ion transport between bulk and grain boundaries. Impedance spectroscopy has been used as a tool to analyze the conductivity of the polycrystalline materials.…”

Section: Introductionmentioning

confidence: 99%

Ionic conductivity and dielectric relaxation in Y doped La2Mo2O9 oxide-ion conductors

Paul

Ghosh

2014

Journal of Applied Physics

Self Cite

View full text Add to dashboard Cite

In this work, we have studied electrical conductivity and dielectric properties of polycrystalline La 2Àx Y x Mo 2 O 9 (0.05 x 0.3) compounds in the temperature range from 358 K to 1088 K and the frequency range from 10 Hz to 3 GHz. The bulk and grain boundary contributions to the overall conductivity of these compounds show Arrhenius type behavior at low temperatures. The random free-energy barrier model has been used to analyze the frequency dependence of the conductivity. The charge carrier relaxation time and its activation energy have been determined from the analysis of the conductivity spectra using this model. The results obtained from the random free-energy barrier model satisfy Barton-Nakajima-Namikawa relation. The conduction mechanism has been also predicted using random free-energy barrier model and the scaling formalism. We have observed that the dielectric relaxation peaks arise from the diffusion of oxygen ions via vacancies. V C 2014 AIP Publishing LLC. [http://dx.

show abstract

“…groups,6,19,34 respectively. It can be apparently seen that P 4 and P 2 peaks show redshift to smaller wavenumber, again convincing the transformation trend from groups.…”

mentioning

confidence: 99%

Detection of oxide-ion and oxygen vacancy swapping via upconversion luminescence in La₂Mo₂O₉:Yb³⁺,Er³⁺

Jiang

Tao

et al. 2016

J. Mater. Chem. C

View full text Add to dashboard Cite

It is requisite to detect thermally activated oxide-ion motion in oxide-ion conductors via an insitu non-contact way when applied in solid oxide fuel cells, oxygen sensors and oxygen separation. This research conceptually proposes an alternative approach by using upconversion (UC) luminescence of Yb 3+ -Er 3+ in La 2 Mo 2 O 9 oxide-ion conductor. According to the results, the temperature-dependent UC luminescence intensity ratio of 2 H 11/2 → 4 I 15/2 to 4 F 9/2 → 4 I 15/2 transitions of Er 3+ can reveal the activation process of oxide-ion and oxygen vacancy swapping at 150-200 °C in α-La 2 Mo 2 O 9 , which has a break point in the plot. It is also evidenced and convinced by the temperature-dependent UC decay curves, temperature-dependent alternating current (AC) impedance data, temperature-dependent internal friction data and temperaturedependent Raman data. The analysis according to Judd-Ofelt theory supports this point as well. 2The research may promote new application of luminescence, and offer an alternative approach to design novel multifunctional materials.

show abstract

Structure and vibrational properties of La2−xBixMo2O9 (0.05⩽x⩽0.4) oxygen ion conductors

Cited by 24 publications

References 28 publications

Correlation of structure and ion conduction in La2−xYxMo2O9 (0 ≤ x ≤ 0.2) oxygen ion conductors

Correlation of structure and ion conduction in La2−xYxMo2O9 (0 ≤ x ≤ 0.2) oxygen ion conductors

Ionic conductivity and dielectric relaxation in Y doped La2Mo2O9 oxide-ion conductors

Detection of oxide-ion and oxygen vacancy swapping via upconversion luminescence in La₂Mo₂O₉:Yb³⁺,Er³⁺

Contact Info

Product

Resources

About

Structure and vibrational properties of La2−xBixMo2O9 (0.05⩽x⩽0.4) oxygen ion conductors

Cited by 24 publications

References 28 publications

Correlation of structure and ion conduction in La2−xYxMo2O9 (0 ≤ x ≤ 0.2) oxygen ion conductors

Correlation of structure and ion conduction in La2−xYxMo2O9 (0 ≤ x ≤ 0.2) oxygen ion conductors

Ionic conductivity and dielectric relaxation in Y doped La2Mo2O9 oxide-ion conductors

Detection of oxide-ion and oxygen vacancy swapping via upconversion luminescence in La2Mo2O9:Yb3+,Er3+

Contact Info

Product

Resources

About

Detection of oxide-ion and oxygen vacancy swapping via upconversion luminescence in La₂Mo₂O₉:Yb³⁺,Er³⁺