Dhananjai Pandey

Evidence for First Order Cubic Paraelectric to Rhombohedral Ferroelectric Phase Transition in 0.8BiFeO3-0.2Pb(Fe1/2Nb1/2)O3 (2009)

Patel, Jay Prakash, Singh, Anar, Pandey, Dhananjai

The current controversies about the existence of an intermediate 'beta' phase of BiFeO_3 and the high temperature paraelectric 'gamma' phase are resolved by studying the sequence of ferroic...

Direct Evidence for Multiferroic Magnetoelectric Coupling in 0.9BiFeO3-0.1BaTiO3 (2008)

Singh, Anar, Pandey, Vibhav, Kotnala, R. K., Pandey, Dhananjai

Magnetic, dielectric and calorimetric studies on 0.9BiFeO3-0.1BaTiO3 indicate strong magnetoelectric coupling. XRD studies reveal a very remarkable change in the rhombohedral distortion angle and a...

Structural Basis for the Anomalously Low Spontaneous Polarisation Values of the Polar Phase of Sr1-xCaxTiO3 (x=0.02, 0.04): Evidence for a Ferrielectric Ordering (2008)

Mishra, Sanjay Kumar, Pandey, Dhananjai

Full pattern Le-Bail refinement using x-ray powder diffraction profiles of Sr1-xCaxTiO3 for x=0.02, 0.04 in the temperature range 12 to 300 K reveals anomalies in the unit cell parameters at 170, 225...

Ocean coast effect on magnetotelluric data: A case study from Kachchh, India (2008)

Pandey, Dhananjai, Sinha, Martin, MacGregor, Lucy, Singh, Satish

The effects of the ocean coast on magnetotelluric (MT) data have been studied and results are described in this article. MT soundings from various sites along coastal plains of Kachchh were acquired...

Existence of Large Room Temperature Ferroelectricity in Chemical Solution Grown PbTiO3 Buffered (BiFeO3)1-x-(PbTiO3)x Films on Pt/Si Substrates (2008)

Garg, Ashish, Kar, Soumya, Agrawal, Dinesh Chandra, Bhattacharjee, Shuvrajyoti, Pandey, Dhananjai

Here, we report the existence of large remnant polarization and dielectric constant in PbTiO3 buffered polycrystalline (BiFeO_3)_{1-x} (PbTiO_3)_x thin films of composition x = 0.25, 0.30 and 0.35...

Evidence for monoclinic crystal structure and negative thermal expansion below magnetic transition temperature in Pb(Fe_1/2Nb_1/2)O_3 (2007)

Singh, Satendra Pal, Pandey, Dhananjai, Yoon, Songhak, Baik, Sunggi, Shin, Namsoo

The existing controversy about the room temperature structure of multiferroic Pb(Fe_1/2Nb_1/2)O_3 is settled using synchrotron powder x-ray diffraction data. Results of Rietveld refinements in the...