Showing papers by "Mukul Gupta published in 1993"
TL;DR: In this article, the thin film deposition of yttria and dysprosium on single crystal substrates of YSZ and SrTiO 3 has been studied under MBE conditions.
14 citations
15 May 1993-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: The changes induced by γ-ray irradiation in the optical transmission of some undoped and impurity doped BGO crystals are investigated in this paper, where stoichiometric deviations and the presence of Fe-ions in the crystal lattice have been found to affect the thermoluminescent emission and transmission recovery at room temperature.
Abstract: The changes induced by γ-ray irradiation in the optical transmission of some undoped and impurity doped BGO crystals are investigated. The stoichiometric deviations and the presence of Fe-ions in the crystal lattice have been found to affect the thermoluminescent emission and transmission recovery at room temperature. A good control over the crystal stoichiometry is found necessary to realise crystals of high radiation hardness and exhibiting a good transmission recovery. For the stoichiometric crystals prepared, the observed loss of transmission for an exposure of 116 Mrad is about 4%.
7 citations
TL;DR: In this article, energy-dispersive Xray and X-ray diffraction analyses for as-prepared films of two different thicknesses, 2-3 μm and 10-15 μm, are reported.
Abstract: Thick films of YBa2Cu3Ox (123) prepared on a number of substrate materials, namely Si, Al2O3, SrTiO3, MgO and YSZ, have been investigated for the compositional variations/impurity phases present, microstructure, grain orientation etc. Energy-dispersive X-ray and X-ray diffraction analyses for as-prepared films of two different thicknesses, 2–3 μm and 10–15 μm, and after their partial and complete etching, are reported. The results show that the film-substrate reaction dominates up to ∼2–3 μm thickness of a film. The decomposition of 123 material at the processing temperature and the substrate-film reaction together are seen to govern the crystallization behaviour, compositional variations and the superconducting properties of the films. In various cases, the films have been found to undergo superconducting phase transitions at temperatures between 66 and 89.5 K.
1 citations