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R. C. Kambale,Y. A. Park,허남정,K. Y. Rajpure,S. S. Suryavanshi 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.6
Magnetostrictive-piezoelectric heterostructures show the strong magnetoelectric (ME) interactions that are mediated by mechanical forces. Magnetoelectric particulate composite structures of (0.1, 0.2, 0.3) mol% CoMn<SUB>0.2</SUB>Fe_(1.8)O_4– (0.9, 0.8, 0.7) mol% BaZr_(0.08)Ti_(0.92)O_3 has been prepared by a solid-state reaction. X-ray diffractometry patterns show variation in the amount of intensity of the spinel phase with ferrite content. The effect of constituent phase variation on the B–H hysteresis behavior and the dielectric properties was examined. The dielectric constant shows the usual dielectric dispersion behavior with increasing frequency which is due to the Maxwell–Wagner type surface interfacial polarization. The dynamic transverse ME coefficient α_(ME) of the composites has been measured at 850 Hz. The strong dependence of ME response on the content of ferrite phase was observed. The paper presents the investigations on ME composites for their dielectric, magnetic and ME properties. The results are discussed with proper scientific reasons along with the applicability of the materials in ME sensing devices.
Rahul C. Kambale,K.M. Song,허남정 한국물리학회 2013 Current Applied Physics Vol.13 No.3
Multiferroic properties of (x) CoMn0.2Fe1.8O4e(1-x) BaTiO3 particulate magnetoelectric (ME) composites with x ¼ 0.1, 0.2, 0.3 M percentage was investigated. The CoMn0.2Fe1.8O4 (CMFO) phase was synthesized by solution combustion route and BaTiO3 (BT) phase was synthesized by wet chemical method. X-ray diffraction studies revealed the purity of constitute phases; confirmed the manifestation of CMFO and BT within the ME composite structure. The microstructural aspects were observed by using Fe-SEM; revealed the effect of constituent phases on the average grain size of the composites. The temperature dependent dielectric properties for BT exhibited the three anomalies associated to its crystallographic lattice structure change with temperature. Dielectric constant of the composite was found to be decreased with CMFO content. All the composite structures exhibited typical magnetic hysteresis nature at room temperature and showed linear effect on the saturation magnetization of the composite with CMFO content. The ME response was examined at room temperature with an ac magnetic field at 1 kHz, all the composite showed a sharp decreasing behavior of the ME voltage coefficient (aME) to an applied dc bias in low field region. The maximum aME factor of w8.51 mV/cm Oe was observed for 10% CMFO e90% BT composition.
Magnetocaloric Effect in Ni-Zn Ferrite Nanoparticles Prepared by Using Solution Combustion
K. D. Lee,R. C. Kambale,허남정 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.11
NixZn1−xFe2O4 (x = 0.2 and 0.3) ferrite nanoparticles with sizes ranging from 65 to 70 nm weresynthesized employing the solution combustion route. The magnetocaloric behavior was investigatedwithin the 50 K T 400 K range of temperatures (T). The entropy change (S) and theadiabatic temperature change (T) were derived from magnetization (M) and specific heat (CP )measurements. Both compositions exhibited broad peaks for the isothermal entropy change. Themagnetic field (H)-dependent T was analyzed within the mean-field approximation scheme, andthe observed magnetocaloric properties of the nanoparticle samples were compared with those ofa bulk sample. Our study suggests that the magnetocaloric properties of magnetic oxides stronglydepend on the particle size; thus, particle size should be considered as a key tuning parameter inthe optimization of magnetic refrigeration.
Kadhane Pravin S.,Baraskar Bharat G.,Darvade Tulshidas C.,Ramdasi Onkar A.,Samsuzzaman Md.,Kambale Rahul C. 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.5
Three different measurement methods to determine the structural phase transitions and Curie temperature of Ba 0.97 Ca 0.03 Ti 1−x Sn x O 3 (BCTS, x = 0.025, and 0.035 mol). electroceramics are discussed. At room temperature, both com- positions reveal the tetragonal perovskite lattice symmetry as evidenced by X-ray diffraction, temperature-dependent dielectric constant and Raman active modes. The temperature-dependent dielectric study reveals T R-O at − 60 °C, T O-T at 14 °C, T T-C at 126 °C for composition x = 0.025 and T R-O at − 50 °C, T O-T at 20 °C, T T-C at 118 °C for composition x = 0.035. To evident the structural changes happening at phase transitions as well as Curie temperature the variation of polarization concerning temperature is investigated which supports the temperature-dependent dielectric and Raman spectroscopy studies. The room temperature recoverable energy storage density and efficiency of BCTS are calculated by the integral area 3 of the polarization–electric fi eld (P-E) hysteresis loop. The observed recoverable energy storage density is 21.80 mJ/cm and 32.40 mJ/cm 3 with the efficiency of 43.58% and 52.25% for composition x = 0.025 and 0.035 mol., respectively. These results are having practical importance, due to the higher recoverable energy storage density and efficiency with moderate Curie temperature compared to the pure BaTiO 3 . Thus, it can be used as a promising novel and environmentally friendly, lead-free material, for different applications in low carbon vehicles, renewable energy technologies, integrated circuits, and for the high-temperature aerospace sector.