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Chapter and Conference Paper
Jc-B Properties of (Nd-Y)123 System Melt Textured in Air
The substitution of Nd ion at Ba sites in the Nd123 system depends on many factors such as oxygen partial pressure, growth temperature and melt composition as evident from their Jc-B results. The survey of litera...
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Chapter and Conference Paper
Jc-B Properties of NdBa2Cu3Oy System Processed by a Novel Melt Growth Technique
Based on the growth temperature dependence of Jc-B properties we earlier reported a technique in which a sample was grown alternatively at higher and lower temperatures. In this work we investigate the growth of ...
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Chapter and Conference Paper
On Improving Irreversibility Field in Nd422 Rich Nd123 Systems with a Modified Growth Technique
Recently we reported that the temperature controlled tailoring of Jc-B properties is possible in Nd123 + 20 mol % Nd422 systems by a modified two step growth process. By growing samples at two growth temperatures...
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Chapter and Conference Paper
Magnetic Relaxation Properties in Ocmg Processed Nd-Ba-Cu-O Bulk Superconductors
Resent studies have revealed that OCMG-processed RE-Ba-Cu-O (RE = Nd, Sm, Eu, Gd) superconductors show large J c values at fields around 2 to 3 T at 77 K, accompanied by secondary peak effect as w...
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Chapter and Conference Paper
Effect of Y and Gd Additions on the Jc-B Properties of (Nd, Sm, Eu)123 System
Bulk crystals of (Nd, Sm, Eu)1-xAxBa2Cu3Oy (A=Y and Gd) containing Y and Gd in the range x=0 to 0.25 were grown by the oxygen-controlled-melt-growth (OCMG) method. The heat treatment profiles for the melt process...
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Chapter and Conference Paper
Effect of Growth Temperature on Superconducting Properties of Nd-Ba-Cu-O
Nd-Ba-Cu-O superconductors are known to form a Nd1+xBa2-xCu3O7-xtype solid solution. The range of the solid solution is temperature dependent, and therefore, the superconducting properties of Nd-Ba-Cu-O crystals ...
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Article
Relationship between growth rate and undercooling in Pt-added Y1Ba2Cu3O7−x
Y1Ba2Cu307−x (Y123) crystals were grown by two different methods, the constant undercooling solidification and the continual cooling method, with top seeding by Sm123 seed crystals in order to investigate a relat...
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Article
Macrosegregation of Y2Ba1Cu1O5 particles in Y1Ba2Cu3O7−δ crystals grown by an undercooling method
Macrosegregation of Y2Ba1Cu1O5 (Y211) particles was observed in Pt-added Y1Ba2Cu3O7−δ (Y123) crystals grown by an undercooling method. It was found that the macrosegregation of Y211 particles depended on the grow...
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Chapter and Conference Paper
Local Structure Determination in Molten YBCO Systems Using Exafs Technique
The molten structure is known to play an important role in melt growth. We have investigated the local structure in molten REBCO systems by X-ray Absorption spectroscopy. We made Cu K-edge X-ray absorption nea...
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Chapter and Conference Paper
Effect of Undercooling on Solidification in YBCO
Y1Ba2Cu3O7-δ (Y123) crystals were grown by the undercooling method at constant temperatures with Sm123 seed crystals in order to investigate a relationship between undercooling (ΔT) and a growth rate (R). The cry...
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Article
Report of a 60 month study on litter production, changes in soil chemical properties and productivity under Poplar (P. deltoides) and Eucalyptus (E. hybrid) interplanted with aromatic grasses
Quantity of litter fall, its chemical composition, nutrient addition and changes in chemical constituents of soil were studied under agroforestry systems involving Populus deltoides and Eucalyptus hybrid tree wit...
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Article
Ammonia volatilization from a flooded rice field fertilized with amended urea materials
The extent of ammonia volatilization from prilled urea, urea supergranule and urea amended with neem seed cake, shell-lac and dicyandiamide was studied in a field experiment on flooded rice. The ammonia loss w...
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Chapter and Conference Paper
XANES Study of Copper Valence and Structure in High Tc Superconducting Oxides
The question of Cu3+ and role it may play in the mechanism of the HTSC in the perovskites recently has been examined in depth employing XPS and XANES techniques [1–5]. The Cu 2p XPS and valence band emission from...
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Article
XANES and EXAFS in Cu-Ti and Ni-Zr glasses
X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) measurements have been done at the K-edge of Cu in Cu-Ti glasses and on the K-edges of Ni and Zr in Ni-Zr glass...
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Chapter
Study of Mixed Valent Alloys Sm1−x ScXS by X-Ray Absorption Technique
Sm in SmS is divalent and the compound is a black-coloured Semiconductor. Measurements of its lattice parameter (1), magnetic susceptibility (2) and L111 X-ray absorption measurements (3) suggest that its cationi...
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Article
XANES and EXAFS study of some metal-metalloid glasses
XANES and EXAFS techniques are proving very popular in the study of local environment in disordered systems. Results of such studies in a large number of metal (Fe, Co, Ni, etc)-metalloid (B, Si, C, etc) glass...
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Chapter and Conference Paper
Study of XANES at the K Absorption Edge in Some 3d Compounds
Unlike EXAFS, the x-ray absorption near edge structure (XANES) is not even qualitatively well understood at present. Need for studies to extend our understanding of the XANES could not, therefore, be overempha...
