300 citations · 1.5k across the 81 of their papers we have counts for
6 papers · 1 filter
Neutron-Irradiation Induced Magnetization and Persistent Defects at High Temperatures in Graphite
Ranjan Mittal, Mayanak K. Gupta, Sanjay K. Mishra +8
Structural as well as magnetization studies have been carried out on graphite samples irradiated by neutrons over 50 years in the CIRUS research reactor at Trombay. Neutron diffrac…
Phonons and Lithium diffusion in LiAlO
Mayanak K. Gupta, Ranjan Mittal, Baltej Singh +5
We report on investigations of phonons and lithium diffusion in LiAlO based on inelastic neutron scattering (INS) measurements of the phonon density of states (DOS) in γ-LiAlO$…
Anharmonic Phonons and Anomalous Thermal Expansion of Graphite
Ranjan Mittal, Mayanak K. Gupta, Baltej Singh +2
We have investigated the anisotropic thermal expansion of graphite using ab-initio calculation of lattice dynamics and anharmonicity of the phonons, which reveal that the negative…
Spin-Phonon Coupling and Thermodynamic Behaviour in YCrO3 and LaCrO3: Inelastic Neutron Scattering and Lattice Dynamics
Mayanak K. Gupta, Ranjan Mittal, Sanjay K. Mishra +4
We report detailed temperature-dependent inelastic neutron scattering and ab-initio lattice dynamics investigation of magnetic perovskites YCrO3 and LaCrO3. The magnetic neutron sc…
Defect topology and annihilation by cooperative cascading movement of atoms in highly neutron irradiated graphite
Ranjan Mittal, Mayanak K. Gupta, Sanjay K. Mishra +10
Graphite has been used as neutron moderator or reflector in many nuclear reactors. The irradiation of graphite in a nuclear reactor results in a complex population of defects. Heat…
Phonons and Oxygen Diffusion in Bi2O3 and (Bi0.7Y0.3)2O3
Prabhatasree Goel, M. K. Gupta, R. Mittal +3
We report investigation of phonons and oxygen diffusion in Bi2O3 and (Bi0.7Y0.3)2O3. The phonon spectra have been measured in Bi2O3 at high temperatures up to 1083 K using inelasti…