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Synthesis of highly pure and dense 0.9(KNbO 3 )‐0.1(BaNi 1/2 Nb 1/2 O 3‐δ ) ceramic with superior magnetic properties
Author(s) -
Tiwari Rajender Prasad,
Hashmi Syed Zimad Husain,
Sharma Raghav,
Khan Saif Ahmad,
Birajdar Balaji
Publication year - 2019
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.16330
Subject(s) - non blocking i/o , materials science , nickel , sintering , nickel oxide , magnetization , ceramic , perovskite (structure) , chemical engineering , analytical chemistry (journal) , metallurgy , magnetic field , chemistry , organic chemistry , catalysis , physics , quantum mechanics , engineering
Residual NiO phase is generally detected in 0.9(KNbO 3 )–0.1(BaNi 1/2 Nb 1/2 O 3‐δ ) (KBNNO) synthesized using NiO as a nickel precursor by solid‐state reaction. In this work, NiO phase is found to exist in the form of the residual NiO particles with a size of 100‐200 nm using energy dispersive X‐ray elemental mapping. These NiO residual particles are eliminated by using nickel acetate as a nickel precursor and a 100% perovskite phase KBNNO is successfully synthesized at as low as 600°C temperature. Furthermore, using the two‐step sintering technique, 100% relative density is achieved in this material. The nickel acetate–based KBNNO shows a robust ferromagnetism with the saturation magnetization of 11.42 memu/g and the remanent magnetization of 3.89 memu/g which is 38 times higher than that of previously reported value in NiO‐based KBNNO. Thus, a highly pure and fully dense KBNNO ceramic with superior magnetic properties is obtained using nickel acetate and by the two‐step sintering method. This is a key step forward in the processing of KBNNO and is likely to have a significant impact on other physical properties of this newly invented and promising photovoltaic perovskite material.