Design and Development of Novel Room Temperature Multiferroics for Multifunctional Devices
Abstract
We have synthesized and examined the room temperature multiferroicity in lead palladium titanate and established a radical new direction in the multiferroic field. Our findings are in contrast to the popular view that palladium may substitute B-site and not A-site in perovskite oxides and thus not be magnetic. PbTiO3 samples doped with 10 percent and 30 percent of Pd were prepared using solid-state reaction method. The phase purity of the samples was confirmed using Rietveld analysis of the recorded x-ray diffraction data. Compositional analysis of the prepared samples was ascertained from the scanning electron micrograph and energy-dispersive x-ray analysis results. Temperature dependent dielectric spectroscopic data indicate only one peak corresponding to the ferroelectric-to-paraelectric phase transition. Upon Palladium doping, the observed ferroelectric transition temperature Tc is found to be lower, which can be argued due to the changes in the unit cell due to off-centre displacements of the B-site cation. Magnetization measurements as a function of applied magnetic field suggest that Pd-doped samples are ferromagnetic at room temperature. 30 percent Pd, the highest dopant sample, exhibits larger magnetic moment 2.8x10^-4 emug-1. However, the coercivity of 10 percent Pd, a lesser dopant sample, is observed to be larger. The magnetic Curie temperature is found to be lower than the ferroelectric Curie temperature, viz.; for 30 percent Pd, the magnetic and ferroelectric Curie temperatures are 450 K and 730 K, respectively. The present work establishes the experimental evidence of room temperature multiferroic in lead palladium titanate materials and suggests its potential applications in non-volatile memories, transducers, and actuators-based devices. To understand the phase stability, we have also studied the high-pressure synchrotron and Raman spectroscopy on multiferroic Pb0.9Pd0.1TiO3 using a diamond anvil cell.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 31, 2021
- Accession Number
- AD1231229
Entities
People
- Ram S. Katiyar
Organizations
- University of Puerto Rico