Nanocrystalline ferroelectric Pb 0.92Sm 0.08(Zr 0.53Ti 0.47) 0.98O 3 with high dielectric constant has been synthesized by mechanical alloying (high energy ball milling). The ferroelectric material exhibits novel behavior when its crystallite size falls below a critical length scale of 40 nm. We observed phenomena such as significant decrease in dielectric constant and phase transition from Tetragonal to Cubic structure on reduction in crystallite size below 40 nm. Copyright © 2009 American Scientific Publishers All rights reserved.

Budaraju Srinivasa Murty

Department of Metallurgical and Materials Engineering

CRITICAL LENGTH

CUBIC STRUCTURE

Dielectric constants

ferroelectric

High dielectric constants

HIGH-ENERGY BALL MILLING

Lead zirconate titanate

Nanocrystalline

NANOCRYSTALLINE FERROELECTRICS

NANOSCALE STRUCTURE

Ball milling

Ceramic capacitors

Crystallite size

Dielectric waveguides

Ferroelectric materials

Ferroelectricity

Lead

Mechanical Alloying

Metallurgy

Nanocrystalline alloys

Permittivity

Zirconium

Phase Transitions

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Journal of Nanoscience and Nanotechnology

We present in this article the latest development of single-phase nanocrystalline ceramics, x(BiAlO3) - y(BaZr0.2Ti 0.8O3) - (1 - x - y) (Ba0.7Ca 0.3TiO3), abbreviated as xBAO - yBZT - (1 - x - y) BCT with (x, y) = (0, 0.50), (0.01, 0.49), (0.03, 0.47), and (0.1, 0.4), which were prepared using a high-energy ball milling technique. In the current study, BZT - xBCT has been selected as a host system to be incorporated into BiAlO 3. Their properties of structure, relative dielectric permittivity (ε), diffuse phase transition (γ), peak broadening (δ γ ), and deviation from Curie-Weiss law (ΔT C) were systematically investigated. However, the decreasing trend of Curie temperature (T c) in the system does not obey the Vegard's law. Analysis of X-ray diffraction patterns shows the solid solubility of (Bi 3+, Ca2+) into A-site and that of (Zr4+, Al3+) into B-site of pure BaTiO3 lattice of tetragonal symmetry with space group P4mm. The values of γ (1.75 to 1.63) confirmed that the ceramic has intermediate behavior between the relaxor and normal ferroelectric, which is evaluated by modified Curie-Weiss law. The high value of quality factor (115), when x = 0.01, y = 0.49 at 1-kHz frequency and temperature 323 K (50 C), decreases with the increasing frequency. © 2013 The Minerals, Metals &amp; Materials Society and ASM International.

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Investigation of structural and diffuse phase transition of new nano lead-free system xBAO - YBZT - (1-x-y) BCT

Nanoscale structure-property relations in sm modified lead zirconate titanate El

Nanoscale ferroelectric ceramics have typical nonlinear characteristics that make it suitable for device applications. A clear understanding and analysis of nonlinearity is therefore of prime importance. Finite element model approach was used to investigate, analyze, and predict nonlinearity in Gd doped PZT (PGZT) prepared by mechanical alloying (high-energy ball milling technique). The nanoindentation tests have been carried out to study the nonlinear properties of green compact nanoceramic, which has cubic phase PGZT. The predictions of the finite element modeling (FEM) appear to be in excellent agreement with the experimental data thereby confirming the accuracy level of the FEM method of analysis.

Materials and Manufacturing Processes

Finite element model in nanoindentation to study nonlinear behavior of nanoceramic PGZT

Physical Review Letters

Controlling Polarization Dynamics in a Liquid Environment: From Localized to Macroscopic Switching in Ferroelectrics

Journal of Applied Physics

Size and temperature induced phase transition behaviors of barium titanate nanoparticles

Macroscopic Channel-Size Effect of Nonequilibrium Electron Distributions in Quantum Hall Conductors

Journal	Journal of Nanoscience and Nanotechnology
ISSN	15334880
Open Access	No