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- 저자 : Dinesh Varshney (검색결과 2 건)
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Dinesh Varshney,Neha Dodiya 한국물리학회 2013 Current Applied Physics Vol.13 No.7
The electrical resistivity behaviour of alkali metal (Na, K, Rb) substitutions at La site in LaxAyMnwO3(A = Na, K, Rb) manganites is studied caused by electronephonon, electroneelectron and electron emagnon scattering. Substitutions affect average mass and ionic radii of A-site and hence resulting lattice and optical phonon softening. Estimated resistivity compared with reported metallic resistivity,accordingly rdiff. = [rexp - {r0 + reeph (=rac + rop)}], infers electroneelectron and electronemagnon dependence over most of the temperature range. Electronephonon contribution indicates that alkali metal K doping provoked larger lattice distortion, while electroneelectron interaction is more dominating process for Na and Rb doped compound favouring motion of excess charge carrier. Semiconducting nature is discussed with variable range hopping and small polaron conduction model. The change in activation energies and the density of states at the Fermi-level is consistently explained by cationic disorder and Mn valence.
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Effect of Zn and Mg doping on structural, dielectric and magnetic properties of tetragonal CuFe2O4
Kavita Verma,Ashwini Kumar,Dinesh Varshney 한국물리학회 2013 Current Applied Physics Vol.13 No.3
The Cu1=xAxFe2O4 (A = Zn, Mg; x = 0.0, 0.5) ferrites were successfully synthesized by chemical coprecipitation method. X-ray diffraction and Raman spectroscopy reveals that all the ferrite samples are in single-phase with tetragonal structure for CFO and cubic spinel structure for CZFO and CMFO samples. SEM micrograph shows the variation of grain size with Zn and Mg doping in parent CFO sample. Frequency dependent dielectric response confirms the dielectric polarization and electrical conduction mechanism in the present series with a maximum value of dielectric constant and loss tangent for CZFO sample. The anomaly w493 K in temperature dependent dielectric constant and dielectric loss is assigned to tetragonal to cubic phase transition in CFO sample. The magnetic measurement explored that the saturation value (Ms) is maximum for CZFO as compared to CFO and CMFO ferrites samples.
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