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RISS 인기검색어
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- 저자 : Kiran Shinde (검색결과 6 건)
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Kiran P. Shinde,오상수,백승규,김호섭,Bhavesh B. Sinha,정국채 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.12
A facile and rapid Glycine-assisted combustion method was developed to synthesize polycrystalline La<SUB>0.8</SUB>Ca<SUB>0.2</SUB>MnO<SUB>3</SUB> (LCMO) powder using dissolution of lanthanum nitrate, calcium nitrate, manganese nitrate (oxidant) and Glycine (fuel) as the starting materials and water as solvent, then heating the resulting solution on a heating plate. The x-ray diffraction and FTIR analysis confirms the orthorhombic crystal structure and morphological study shows the polycrystalline form of LCMO powder. The calculated lattice constant a = 5.46, b = 7.73 and c = 5.49 Å are well in agreement with standard values. The magnetic measurements show the paramagnetic behavior of LCMO at room temperature. The maximum change in entropy observed for the LCMO sample is -1.95 J/kgK at an applied magnetic field 2T at Curie temperature of 165 K.
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Kim, Gwan-Tae,Kim, Ho-Sup,Ha, Dong-Woo,Shinde, Kiran-Prakash,Chung, Kook-Chae Elsevier 2018 Physica. C, Superconductivity Vol.553 No.-
<P><B>Abstract</B></P> <P>The effect of deposition rate on the superconducting properties in the manufacturing process of SmBCO superconducting thin films was investigated. The superconducting layer was deposited using the EDDC (Evaporation using Drum in Dual Chambers) deposition process. An apparatus for continuously changing the deposition rate was constructed with a shield having a triangular open area in one chamber. Sm<SUB>1+x</SUB>Ba<SUB>2</SUB>Cu<SUB>3+y</SUB>O<SUB>7</SUB> (SmBCO) superconducting thin film samples were fabricated by continuously increasing the deposition rate of the SmBCO superconducting layer in the longitudinal direction from 0 to 28 nm/min at the tape length of 12 cm in an atmosphere with a substrate temperature of 800 ̊C. The magnetic field dependence of the critical current was measured using the PPMS in the direction of the magnetic field parallel to the c axis of the superconducting thin film to found out the optimal deposition rate under magnetic field. The TEM analysis results confirmed the flux pinning centers of rod and particle shapes, and the flux pinning density was the highest in the sample with a deposition rate of 21 nm/min. These flux pinning centers formed by the combination of rod and particle shapes improved the critical current characteristics under the magnetic field of SmBCO superconducting wire.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effect of deposition rate on pinning center formation was investigated in reactive co-evaporation process. </LI> <LI> The optimum deposition rate was obtained for pinning centers. </LI> <LI> The flux pinning centers with rod and particle shapes were formed. </LI> </UL> </P>
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Kim, Gwan-Tae,Kim, Ho-Sup,Ha, Dong-Woo,Chung, Kook-Chae,Shinde, Kiran Elsevier 2018 Physica. C, Superconductivity Vol.545 No.-
<P><B>Abstract</B></P> <P>Sm<SUB>1+x</SUB>Ba<SUB>2</SUB>Cu<SUB>3+y</SUB>O<SUB>7−d</SUB> (SmBCO)-coated conductors containing pinning centers were prepared by a reactive co-evaporation method using the EDDC (Evaporation using Drum in Dual Chamber) deposition system. Superconducting materials based on Sm, Ba, and Cu were evaporated in the evaporation chamber and deposited onto the drum-mounted substrate, while the deposited element reacted with oxygen and resulting in the SmBCO superconducting phase inside the reaction chamber. Tape-type samples (length = 30 cm, width = 4 mm, thickness = 0.1 mm) with the structure of Ag/SmBCO/LMO/MgO/Y<SUB>2</SUB>O<SUB>3</SUB>/Al<SUB>2</SUB>O<SUB>3</SUB>/Hastelloy were prepared, where the SmBCO film was spread along the tape length. The critical current was measured using the non-contact Hall-probe method, and the field dependences of the critical current under a high magnetic field were measured. The superconducting properties of the samples under a magnetic field were highly influenced by the composition of the SmBCO film. Furthermore, elemental mapping of the high-Jc SmBCO-coated conductor was measured by transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy (TEM-EDX). Finally, we confirmed the Sm-related secondary phases take the role of pinning centers.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We successfully synthesized two Sm<SUB>1+x</SUB>Ba<SUB>2</SUB>Cu<SUB>3+y</SUB>O<SUB>7−d</SUB> (SmBCO)-coated conductors containing pinning centers via a reactive co-evaporation method using the EDDC (Evaporation using Drum in Dual Chamber) deposition system. </LI> <LI> The superconducting properties of the samples under a magnetic field were highly influenced by the composition of the SmBCO film. This is significant because pinning centers could be formed using only superconducting elements without adding any other elements. </LI> <LI> The reported gradient deposition method based on a simultaneous evaporation technique will allow us to determine optimal superconducting properties, crystal orientations, and thin film surface morphologies in a wide range of composition ratios. </LI> </UL> </P>
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The Post-Annealing Effect on the Pinning Properties of GdBa2Cu3O 7−δ Coated Conductors via RCE-DR
Oh, Won-Jae,Park, Insung,Lee, Jae-Hun,Lee, Hunju,Moon, Seung-Hyun,Shinde, Kiran,Chung, Kookchae,Yoo, Sang-Im Institute of Electrical and Electronics Engineers 2018 IEEE transactions on applied superconductivity Vol.28 No.4
<P>We report the post-annealing effect on the pinning properties of GdBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7−δ </SUB> (GdBCO) coated conductors (CCs) fabricated by a reactive co-evaporation deposition and reaction process. The GdBCO CCs annealed at 750 °C in the PO<SUB>2</SUB> of 300 mtorr for 15 min show the most enhanced critical current densities (<I>J<SUB>c</SUB></I>) for <I>B</I>//<I>c</I> due to the stacking faults (SF) piled up along the <I>c</I>-axis. The minimum <I>J<SUB>c</SUB></I> values of post-annealed samples in relatively higher fields such as 5 T at 77 K and 7 T at 65 K were larger than those of pristine sample; although their minimum <I>J<SUB>c</SUB></I> values were lower in relatively lower fields such as 1 T at 77 K and 3 T at 65 K. In-field <I>J<SUB>c</SUB> </I> values for <I>B</I>//<I>ab</I> were closely related to the density of SFs within samples. Analysis results by transmission electron microscopy revealed that the SF density was remarkably reduced after the post-annealing process, which is responsible for enhanced minimum <I>J<SUB>c</SUB></I> values and significantly degraded <I>J<SUB>c</SUB></I> values for <I>B</I>//<I>ab</I> in relatively higher fields.</P>
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