Structural, dielectric, and ferroelectric characteristics of the low-temperature sintered 65PMN-35PT sample for electroceramic applications
Published in Materials
A single-phase, highly dense 65PMN-35PT pellet sample was obtained at a low sintering temperature (875 oC) using a two-step columbite precursor route. The sample crystallized in a tetragonal structure with a tetragonality factor of c/a = 1.01. The sample consists of small grains with microstructural inhomogeneity due to its lower sintering temperature and short sintering period. The material exhibits excellent dielectric and ferroelectric properties. The electrically poled sample shows excellent ferroelectric characteristics, with saturation and remnant polarization values of 25.9 and 20.1 μC cm-2, respectively. The sample also has a low leakage current density, suggesting its potential in electroceramic applications.
The modified two-stage columbite method:
We employed the modified two-stage columbite route to prepare a single-phase and dense 65PMN-35PT ceramic sample without unwanted pyrochlore phase. It involves first synthesizing a columbite precursor material, MgNb₂O₆ and then reacting it with other oxides (PbO and TiO₂) to form the desired perovskite structure. This method is favored for its ability to reduce the formation of impurity pyrochlore phases, and improve the desired perovskite 65PMN-35PT phase and its physical properties. This method helped us to reduce the sintering temperature and no excess PbO is needed during the synthesis process.
Structural Characteristics:
X-ray diffraction analysis confirms a single-phase 65PMN-35PT with a perovskite structure and a tetragonal phase, crucial for ferroelectric properties. Morphological studies reveal small grains, 2 micrometers in size.
Dielectric Properties:
- The combination of low-temperature sintering, single-phase structure together with good dielectric and ferroelectric characteristics makes this ceramic material a potential candidate for numerous electroceramic applications.
- The observed relatively high polarization values are particularly suitable for applications such as capacitors and actuators.
- Additionally, the low sintering temperature is advantageous for reducing processing costs and also enable the use of less expensive substrates in device processing.
Objective: I aim to enhance my skills and experience in the fields of experimental condensed matter physics and low-temperature physics. I like to explore new characterization techniques and novel materials for my future research.
Area of Interests: Experimental Condensed Matter Physics and Low-Temperature Physics: Strongly correlated electronic systems – multiferroics, magnetoelectric materials, thermoelectric compounds, shape memory alloys, topological insulators, Heusler alloys, and unconventional superconductors.
Skills and Expertise:
Multiferroics, Thermoelectricity, Magnetic Materials and Magnetism, Ferroelectric Materials, Ceramic Materials, Physical Properties, Magnetic Properties, Optical Properties, Pulsed Laser Deposition, Material Characterization, X-ray Diffraction, Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Infrared and Raman spectroscopy, X-ray Photoelectron Spectroscopy, UV-Visible Spectroscopy, Differential Optical Absorption Spectroscopy, Electron Spin Resonance Spectroscopy, Thermal Conductivity, Seebeck Coefficient, Hall Effect, Thermal Analysis, Electrical Characterization
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