Effect of sintering temperature on electrical transport properties of La0.67Ca0.33MnO3

Venkataiah, G.; Krishna, D.C.; Vithal, M.; Rao, S. Narasimha; Bhat, S. V.; Prasad, V.; Subramanyam, S. V.; Reddy, P. Venugopal

doi:10.1016/j.physb.2004.12.001

Cited by 126 publications

(37 citation statements)

References 16 publications

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“…8. The parameters θ D /2 and E P for all the samples were obtained and are included in Table 5 and one can note that all these parameters are in agreement with the reported ones [18,32,33]. It is clear from the table that, the activation energy (E P ) values are decreasing, except in the case of LBMO with increasing A-site cation size r A and θ D values are increasing continuously, except in the case of LBMO.…”

Section: High Temperature Behavior (T > T P )supporting

confidence: 77%

Influence of A-site cation mismatch on structural, magnetic and electrical properties of lanthanum manganites

Venkataiah

Prasad

Reddy

2007

Journal of Alloys and Compounds

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112

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Section: High Temperature Behavior (T > T P )supporting

confidence: 77%

Influence of A-site cation mismatch on structural, magnetic and electrical properties of lanthanum manganites

Venkataiah

Prasad

Reddy

2007

Journal of Alloys and Compounds

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112

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“…As Table 3 shows, the parameters E a and q a are found to decrease with increase in the grain size, which are consistent with other reports for manganite [41]. In addition, activation energies of the samples are close to the reported value (93.8 meV) for the single crystal bilayered manganite (La 1.2 Sr 1.8 Mn 2 O 7 ) [37].…”

Section: Electrical Propertiessupporting

confidence: 90%

Effects of pH and sintering temperature on the synthesis and electrical properties of the bilayered LaSr2Mn2O7 manganite prepared by the sol–gel process

2012

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The bilayered LaSr 2 Mn 2 O 7 manganite was synthesized by the sol-gel process at different pH values (3.5, 7, and 9.5) and different sintering temperatures (1553, 1623, and 1723 K) to investigate the effects of growth conditions upon the structural and electrical properties of the samples under investigation. X-Ray diffraction and FT-IR spectroscopy techniques confirm the phase formation for all samples. However, samples sintered at 1553, 1623, and 1723 K, and formed at pH = 7 are single phased having a tetragonal structure. Study of these single-phased samples indicates that with increase in the sintering temperature from 1553 to 1723 K, the average grain size increases from *200 to *1000 nm. To investigate the influence of grain size on the conduction mechanism, resistivity of the samples was measured as a function of temperature. The data obtained was analyzed by the adiabatic small polaron hopping model. These analyses show the influence of grain size on the parameters obtained by fitting the data by the above models.

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“…The discovery of the CMR in mixed manganese oxides RE 1−x A x MnO 3 (where RE is a trivalent rare-earth element and A is the divalent cation) has been a subject of study in recent years. These materials have very interesting electrical and magnetic properties, and also have potential applications for magnetic recording, magnetic switches and magnetic sensors [4][5][6][7]. These compounds are Mn 3+ rich and doping of divalent atoms introduces mixture of Mn 3+ and Mn 4+ ions.…”

Section: Introductionmentioning

confidence: 99%

Magnetoresistance studies on barium doped nanocrystalline manganite

Nagabhushana

Chakradhar

Ramesh

et al. 2008

Journal of Alloys and Compounds

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An energetically attractive, simple, fast and a novel low temperature (300• C) solution combustion route for the synthesis of crystalline and homogeneous nanoparticles of lanthanum barium manganese oxide La 0.9 Ba 0.1 MnO 3+δ (LBMO) is reported. Formation and homogeneity of the solid solutions have been confirmed by powder X-ray diffraction (PXRD) and energy dispersive X-ray analysis (EDS) respectively. The Rietveld analysis shows both as-formed as well as calcined samples are in cubic phase with space group pm3m. The microstructure and agglomerated particle size of the compounds are examined by scanning electron microscope. Infrared spectroscopy revealed that both Mn O Mn bending mode and Mn O stretching mode are influenced by calcination temperature. The magnetoresistance measurement on sintered LBMO pellet exhibits a broad metal-insulator transition (T M-I ) at around 228 K. At 1 T applied magnetic field, LBMO shows magnetoresistance (MR) of 10%, whereas for 4 and 7 T, the negative magnetoresistance values are in the range 51 and 59% respectively at T M-I . The experimental resistivity data of the present investigation are fitted to a simple empirical equation in order to understand conduction mechanism in this compound.

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Effect of sintering temperature on electrical transport properties of La0.67Ca0.33MnO3

Cited by 126 publications

References 16 publications

Influence of A-site cation mismatch on structural, magnetic and electrical properties of lanthanum manganites

Influence of A-site cation mismatch on structural, magnetic and electrical properties of lanthanum manganites

Effects of pH and sintering temperature on the synthesis and electrical properties of the bilayered LaSr2Mn2O7 manganite prepared by the sol–gel process

Magnetoresistance studies on barium doped nanocrystalline manganite

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