Raman scattering study of La-, Nd- and Sm-substituted Bi4Ti3O12

Wu, Di; Deng, Yu; Mak, Chee Leung; Wong, K.P.; Li, A.D.; Zhang, M.S.; Ming, Nai‐Ben

doi:10.1007/s00339-003-2244-z

Cited by 31 publications

(13 citation statements)

References 18 publications

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“…This finding is in line with the XRD pattern and FESEM micrograph. It was reported that the duplet peaks observed in Raman spectra tend to merge into one mode when the Bi 3+ is substituted by rare-earth elements (Wu et al, 2005). Similar observation was discovered in BST.…”

Section: Comparison Of Lattice Vibration Bto and Sm 3+ Dopingsupporting

confidence: 72%

Sintering and Characterization of Rare Earth Doped Bismuth Titanate Ceramics Prepared by Soft Combustion Synthesis

Azlan¹,

Krengvirat²,

Noor³

et al. 2012

Sintering of Ceramics - New Emerging Techniques

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Section: Comparison Of Lattice Vibration Bto and Sm 3+ Dopingsupporting

confidence: 72%

Sintering and Characterization of Rare Earth Doped Bismuth Titanate Ceramics Prepared by Soft Combustion Synthesis

Azlan¹,

Krengvirat²,

Noor³

et al. 2012

Sintering of Ceramics - New Emerging Techniques

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“…The La/Ca/K-O and Mn-O bonds govern these modes. If mode frequency is governed by local factors, such as the force constant and ionic mass of the substitutive elements as well, it will be proportional to (k/M) 1/2 , where k is the force constant and M is the reduced mass [50]. The valence and ionic radius of Ca 2?…”

Section: Discussion and Analysis Of Resultsmentioning

confidence: 99%

Metallic and semi-conducting resistivity behaviour of La0.7Ca0.3−x K x MnO3 (x = 0.05, 0.1) manganites

Varshney

Dodiya

2014

J Theor Appl Phys

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The temperature dependence of electrical resistivity, q, of ceramic La 0.7 Ca 0.3-x K x MnO 3 (x = 0.05, 0.1) is investigated in metallic and semi-conducting phase. The metallic resistivity is attributed to be caused by electron-phonon, electron-electron and electron-magnon scattering. Substitutions affect average mass and ionic radii of A-site resulting in an increase in Debye temperature h D attributed to hardening of lattice with K doping. The optical phonon modes shift gradually to lower mode frequencies leading to phonon softening. Estimated resistivity compared with reported metallic resistivity, accordingly q diff. = [q exp. -{q 0 ? q e-ph (=q ac ? q op )}], infers electron-electron and electron-magnon dependence over most of the temperature range. Semi-conducting nature is discussed with variable range hopping and small polaron conduction model. The decrease in activation energies and increase in density of states at the Fermi level with enhanced Ca doping is consistently explained by cationic disorder and Mn valence.

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“…Differential scanning calorimetry (DSC) measurement was performed on a TA-Q200 calorimeter at a heating rate of 10 C/min under N 2 atmosphere. The impedance measurements were performed using a Wayne Kerr 6500B impedance analyser in the temperature range from 30 C to 400 C. The leakage current density measurement was carried out using an aixACCT TF 2000 analyzer.…”

Section: Methodsmentioning

confidence: 99%

“…30 The E mode at 276 cm À1 in BFO shifts to 278 cm À1 indicates destabilization of B-site cations due to the change in internal chemical pressure with the substitution of Sc which in turn causes octahedral tilts 8,31 and hence leads to the structural changes. The co-substitution of Sm and Sc causes disorder in their respective sites which are reflected in terms of increase in the FWHM of Raman modes.…”

Section: Raman Studiesmentioning

confidence: 99%

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Improved magnetization and reduced leakage current in Sm and Sc co-substituted BiFeO3

Rao

Kandula

Kumar

et al. 2018

Journal of Applied Physics

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X-ray diffraction measurements revealed that an orthorhombic Pnma structure evolved with a phase fraction of 84% in the rhombohedral R3c structure of BFO upon the substitution of Sm and Sc. The changes in the intensity and the frequency of Raman modes also corroborated the structural transformation in the BSFSO compound. A decrease in grain size, reduction in porosity, and improved density were observed in the BSFSO compound. An enhanced remanent magnetization of 0.2 emu/g and coercive field of 6.2 kOe were observed, which were attributed to the structural change as well as the destruction of the spin structure with the substitution. Impedance and leakage current measurements revealed that the insulating character of BFO was improved with the substitution of Sm and Sc in BFO and was explained based on the bond enthalpy concept. The enhanced magnetic properties along with the improved insulating character of BSFSO compound will be suitable for device applications. Published by AIP Publishing.

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Raman scattering study of La-, Nd- and Sm-substituted Bi4Ti3O12

Cited by 31 publications

References 18 publications

Sintering and Characterization of Rare Earth Doped Bismuth Titanate Ceramics Prepared by Soft Combustion Synthesis

Sintering and Characterization of Rare Earth Doped Bismuth Titanate Ceramics Prepared by Soft Combustion Synthesis

Metallic and semi-conducting resistivity behaviour of La0.7Ca0.3−x K x MnO3 (x = 0.05, 0.1) manganites

Improved magnetization and reduced leakage current in Sm and Sc co-substituted BiFeO3

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