BALMUKUND SHUKLA
Articles written in Bulletin of Materials Science
Volume 45 All articles Published: 19 October 2022 Article ID 0207
High-pressure studies on pristine and Pb-substituted Bi-based high-temperature superconductor
V GAYATHRI A T SATHYANARAYANA BALMUKUND SHUKLA T GEETHA KUMARY N R SANJAY KUMAR SHARAT CHANDRA
Transport measurements were performed on over-doped samples of pristine and Pb-substituted Bi–Sr–Ca–Cu–O as a function of applied pressure up
to 7 GPa. A monotonic decrease in the superconducting transition temperature accompanied by a change in the normal-state behaviour from metallic to semiconducting
as a function of pressure is observed in the pristine sample. In the Pb-substituted sample, a monotonic decrease in the superconducting transition temperature up to
${\sim}$4.5 GPa followed by an increase after attaining a valley is observed. The pressure required to achieve this increase in
Volume 45 All articles Published: 26 October 2022 Article ID 0215
Compressibility studies of RE$_6$UO$_{12}$ at extreme conditions of pressure
BALMUKUND SHUKLA N R SANJAY KUMAR HRUDANANDA JENA ANUJ UPADHYAY N V CHANDRA SHEKAR
Rare-earth uranates-RE$_6$UO$_{12}$ are synthesized by heating mixture of uranium oxide and rare-earth oxides in 1:6 ratio
above 1273 K. These compounds stabilize in rhombohedral structure at ambient. High-pressure (HP) X-ray diffraction studies reveal that the compounds are
stable at lower pressures, beyond which disorder is seen to originate and compound has a tendency to amporphize at very HPs. The
Volume 45 All articles Published: 2 November 2022 Article ID 0219
High pressure studies on core/shell amorphous carbon nanostructures
G M BHALERAO SURAKANTI SRINIVAS REDDY BALMUKUND SHUKLA SOUMEE CHAKRABORTY V SRIHARI N V CHANDRA SHEKAR
High pressure behaviour of core/shell amorphous carbon (a-C) nanostructures was studied using synchrotron X-ray diffraction (XRD) and Raman spectroscopy up to ${\sim}$25 GPa. These nanostructures having spherical a-C shells with ${\gamma}$-Fe$_2$O$_3$ nanoparticles at the core were synthesized by catalyst-assisted lamp black method. The typical size of core (${\gamma}$-Fe$_2$O$_3$)/shell (a-C) is ${\sim}$5 nm/20 nm. Comparative XRD of the core (${\gamma}$-Fe$_2$O$_3$) in opened- and closed-shell (a-C) shows that the carbon shells do not fully transmit the applied high pressure inwards, under hydrostatic conditions. Raman spectroscopy shows that the graphitic G-mode blue shifts reversibly with applied pressure with a coefficient ${\sim}$3.5 cm$^{-1}$ GPa$^{-1}$, which is ${\sim}$25 to 40% less than that for graphite and carbon nanotubes. It is suggested that a rigid and crosslinked structure of the carbon shell might be lossy for the observed pressure drop.
Volume 46, 2023
All articles
Continuous Article Publishing mode
Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020
Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
Physical Sciences 2020
Click here for Editorial Note on CAP Mode
© 2023-2024 Indian Academy of Sciences, Bengaluru.