Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 877, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.160285
Keywords
Cobalt ferrite; Magnetostriction; Bi-substitution; Anisotropy; Strain sensitivity
Categories
Funding
- Science and Engineering Research Board (SERB), Department of Science and Technology (DST), Govt. of India [CRG/2018/002925]
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Bismuth-substituted cobalt ferrite samples with enhanced magnetostriction were successfully synthesized using a glycine-nitrate based auto-combustion route. The presence of Bi3+ promoted significant grain growth and increased strain sensitivity at lower magnetic fields.
Bismuth-substituted cobalt ferrite, CoBixFe2-xO4 (x = 0, 0.1, 0.2 and 0.3), samples with enhanced magnetostriction behavior were synthesized through a glycine-nitrate based auto-combustion route. The powders were pelletized and sintered at 1450 degrees C for 10 min. The presence of Bi3+ in CoFe2O4 promotes a significant grain growth. The samples with x = 0 and 0.1 are found to be phase pure with cubic spinel structure, whereas a secondary phase (Bi2O3) starts forming beyond this composition due to the low solubility limit of Bi3+ in cobalt ferrite. According to our results, the maximum strain sensitivity (d lambda/dH)(max) for Bi-doped samples (similar to-1.6 x 10(-9) m/A) is considerably higher than that of the parent compound (similar to-1 x 10(-9) m/A) even at lower magnetic-fields. Our work demonstrates the strategy to enhance the strain sensitivity of magnetostrictive sensors at lower applied magnetic fields through sintering of Co-ferrite samples after Bi3+ doping. (C) 2021 Elsevier B.V. All rights reserved.
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