DataVXApplied Physics APaper
journal article·2020-11

Role of Bi2O3 and ZrO2 additives and sintering temperature on cation distribution in barium hexaferrites: an estimation from Neel’s sub-lattice theory

Swathi Chanda, S. Bharadwaj, N. Pavan Kumar, K. V. Siva Kumar, Y. Kalyana Lakshmi

Applied Physics A· Volume 126· Issue 11
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Source abstract

Abstract

A comparative study on the effect of additives ( $$\text {Bi}2\text {O}3$$ and $$\text {ZrO}2$$ ) and sintering temperature on structural, morphological and magnetic properties of M-type barium hexaferrite has been investigated. Oxalate precursor method was used to synthesize $$\text {BaFe}12\text {O}19$$ in the present investigation. Additives $$\text {Bi}2\text {O}3$$ and $$\text {ZrO}2$$ of 1 wt% were added to some part of the calcined powder and sintered at 1100 °C and the remaining powder was sintered at three different temperatures (1100 °C, 1200 °C and 1300 °C). A significant variation in the crystallite and grain sizes of the samples was noticed both as a function of sintering temperature and nature of additives. Insights of hysteresis loops hinted the redistribution of Fe $$3+$$ ions towards octahedral sites, resulting improvement in saturation magnetization with sintering temperature and decrease in coercivity is attributed to an increase in grain size. Incorporation of $$\text {Bi}2\text {O}3$$ and $$\text {ZrO}2$$ in $$\text {BaFe}12\text {O}19$$ leads to decrease of coercivity, squareness ratio but an improvement was evident in saturation magnetization and remanence, and these are explained based on the redistribution of Fe $$3+$$ ions. The distribution of Fe $$3+$$ ions towards octahedral sites was estimated theoretically and compared with experimental magnetic moments with least possible error. Occupancy of Fe $$3+$$ ions in tetrahedral and octahedral sites was further confirmed using Rietveld refinement which shows that $$\chi ^2$$ values are in the acceptable range.
Source: openaire · Quality: candidate unverified · Source record ↗

Research context

Ceramics & glasses

OpenAlex topics: Magnetic Properties and Synthesis of Ferrites · Multiferroics and related materials · Electromagnetic wave absorption materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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