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Effect of P 2 O 5 on the Structural and Magnetic Properties of Magnetite‐Based Glass‐Ceramics
Author(s) -
Sandu Viorel,
Greculeasa Simona,
Kuncser Andrei,
Kuncser Victor
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14457
Subject(s) - magnetite , materials science , crystallization , magnetometer , ceramic , nucleation , relaxation (psychology) , borosilicate glass , superparamagnetism , grain size , magnetic field , mineralogy , mössbauer spectroscopy , chemical engineering , condensed matter physics , analytical chemistry (journal) , nuclear magnetic resonance , magnetization , crystallography , composite material , metallurgy , chemistry , psychology , social psychology , physics , organic chemistry , quantum mechanics , engineering , chromatography
The specific morphology and magnetic properties of magnetite‐based glass‐ceramics obtained by crystallization of Fe‐containing borosilicate glassmelts in the presence of P 2 O 5 as nucleating agent are investigated. We found that the distribution of the tiny nanoparticles of magnetite determines the low temperature response to magnetic field. The observed effects are discussed with respect to the following factors: (1) the existence of a multimodal size distribution of the tiny grains as revealed by Mössbauer spectroscopy, magnetometry, and high‐resolution electron microscopy; (2) the existence of a disordered layer at the grain surface which is driven by field in a magnetically ordered state; and (3) the interplay between the relaxation mechanisms in different temperature ranges.