Rohit R. Shahi
Banaras Hindu University
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Featured researches published by Rohit R. Shahi.
Philosophical Magazine | 2011
T.P. Yadav; Devinder Singh; Rohit R. Shahi; M. A. Shaz; R. S. Tiwari; O.N. Srivastava
In the present investigation, the formation and stability of icosahedral phase in Al70− x Ga x Pd17Mn13 alloys has been explored using X-ray diffraction, scanning, transmission electron microscopy and energy dispersive X-ray analysis. Cast alloys and melt-spun ribbons with x = 2.5, 5, 7.5, 10, 12.5, 15 and 20 have been investigated. In both cases, the alloys up to 5 at% Ga exhibit the formation of pure icosahedral phase. However, for x ≥5 at% Ga content, the cast alloy exhibits the formation of multiphase material, consisting of an icosahedral phase along with AlPd-type B2 and ξ′ crystalline (orthorhombic structure with unit cell a = 23.5 Å, b = 16.6 Å and c = 12.4 Å) phases. In the case of the melt spun ribbon for x = 5 at% Ga, only an icosahedral phase has been found, but for 15 > x > 5 at% Ga, an icosahedral phase is the majority phase with AlPd-type B2 phase being the minority component. For x = 15 at% Ga, a Al3Pd2-type hexagonal phase together with a small amount of quasicrystalline phase is formed. However, for x = 20, only a hexagonal Al3Pd2 phase results.
Acta Crystallographica Section A | 2014
M. A. Shaz; Rohit R. Shahi; T.P. Yadav; Onkar Srivasatava; Sander van Smaalen
The present study deals with the microstructural changes with respect to the processing parameter (quenching rate) and their correlation with hydrogen storage characteristics of Ti45Zr38Ni17 quasicrystalline alloys. The ribbons of the alloy have been synthesized at different quenching rates obtained through different wheel speeds (35, 40, 45 and 50 m/s) and investigated for their hydrogen storage characteristics. The lower cooling rate obtained through low wheel speed (35 m/s) produces, i-phase grains whose size ranges from 300350 nm, whereas higher cooling rates obtained through high wheel speed (45 and 50 m/s) promote the formation of grains with size ranges from 100-150 nm in Ti45Zr38Ni17 ribbons. It has been found that the ribbons synthesized at 35 m/s absorbed ∼2.0 wt%, whereas ribbons synthesized at 50 m/s absorbed ∼2.84 wt. % of hydrogen. Thus the hydrogen storage capacity of ribbon increases for the ribbons produced at higher quenching rate. One of the salient features of the present study is that the improvement of hydrogen storage capacity obtained through higher quenching rates (∼45 to 50 m/s wheel speed) leading to the formation of lower grain size.
International Journal of Hydrogen Energy | 2013
Rohit R. Shahi; Anand P. Tiwari; M.A. Shaz; O.N. Srivastava
International Journal of Hydrogen Energy | 2010
Rohit R. Shahi; T.P. Yadav; M. A. Shaz; O.N. Srivastva
International Journal of Hydrogen Energy | 2009
M. Sterlin Leo Hudson; Pawan K. Dubey; D. Pukazhselvan; Sunil Kumar Pandey; Rajesh Singh; Himanshu Raghubanshi; Rohit R. Shahi; O.N. Srivastava
International Journal of Hydrogen Energy | 2008
Rohit R. Shahi; T.P. Yadav; M. A. Shaz; O.N. Srivastava
International Journal of Hydrogen Energy | 2012
T.P. Yadav; Rohit R. Shahi; O.N. Srivastava
International Journal of Hydrogen Energy | 2014
Rohit R. Shahi; Ashish Bhatnagar; Sunita K. Pandey; Viney Dixit; O.N. Srivastava
International Journal of Hydrogen Energy | 2015
Rohit R. Shahi; Ashish Bhatanagar; Sunita K. Pandey; Vivek Shukla; T.P. Yadav; M. A. Shaz; O.N. Srivastava
International Journal of Hydrogen Energy | 2011
Rohit R. Shahi; T.P. Yadav; M.A. Shaz; O.N. Srivastava; S. van Smaalen
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Motilal Nehru National Institute of Technology Allahabad
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