Amorphous state ferroelectricity, magnon scattering and phase stability in microparticle materials
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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.
KeywordsMicroparticle microemulsion ferroelectricity ferrimagnetism magnon scattering lead zirconate titanate yttrium iron garnet gamma-Fe2O3 Mössbauer spectroscopy
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