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Volume 5 Issue 3-4 August 1983 pp 343-363
Microcrystals of cooperative-behaviour materials
M S Multani R Vijayaraghavan M R Srinivasan P Ayyub V R Palkar V Saraswati A V Gurjar
Properties of materials exhibiting cooperative phenomena are likely to be modified on restricting the lattice size. Several such microcrystalline materials have been studied to infer general underlying principles. Ferroelectricity, ferromagnetism, superconductivity, and superfluidity in limited lattice sometimes not only show modified behaviour but also new behaviour not present in bulk. Microcrystals are considered to be free, coupled, grain-boundary-separated, or domain-wall-separated.
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Volume 6 Issue 2 May 1984 pp 327-338 Microparticle Materials
Amorphous state ferroelectricity, magnon scattering and phase stability in microparticle materials
M S Multani P Ayyub V R Palkar M R Srinivasan V Saraswati R Vijayaraghavan DO Shah
Microparticles and micrograin ceramics show features distinct from the usual-sized polycrystalline materials. Amorphous state material combined with microparticle size for Pb(Zr0.51 Ti0.49)O3 mimics the dielectric behaviour of crystalline ferroelectricity in ABO3 compounds. Fine-grained Y3Fe5O12 (
yig ) synthesized by pressure sintering ofyig microparticles exhibit spinwave relaxation due to transit time across grain diameter. Applying microemulsion techniques for microparticle synthesis,γ -Fe2O3 has been synthesized. The phase stability fractionγ -Fe2O3/α-Fe2O3 is found to be a function of particle size. At very small sizesγ -Fe2O3 becomes amorphous, leading to interesting Mössbauer studies.
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Bulletin of Materials Science
Volume 46, 2023
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Bulletin of Materials Science | News
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Dr Shanti Swarup Bhatnagar for Science and Technology
Posted on October 12, 2020Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
Chemical Sciences 2020Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
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