Low temperature synthesis of ferromagnetic (LaK)MnO3 from KCl,KBr and KI fluxes |
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| Institution: | 1. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, India;2. Material Research Center, Indian Institute of Science, Bangalore 560 012, India;1. Kyushu University, Kasuyamachi, Kasuyagun, Fukuoka 811-2307, Japan;2. Department of Mechanical Systems Engineering, Okinawa National College of Technology, Nago, Okinawa 905-2192, Japan;1. Institute for Advanced Materials, School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, PR China;2. Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, PR China;3. State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum-Beijing, Beijing, 102249, PR China;1. Department of Chemistry, College of Science, Yeungnam University, Gyeongsan, Gyeongbuk 712-749, Republic of Korea;2. Korean Institutes of Ceramic Engineering and Technology (KICET), Jinju, Gyeongnam 660-031, Republic of Korea |
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| Abstract: | Potassium doped lanthanum manganites have been synthesized from KCl, KBr and KI fluxes at 900, 850 and 750 °C respectively. While all the flux-grown oxides are ferromagnetic metals (Tc=290–330 K), the oxides grown from KCl and KBr fluxes crystallize in the rhombohedral structure and that synthesized from KI flux adopts the cubic structure. The enhancement in Tc correlates with the increasing tendency of the flux to get oxidized and decreasing melting points of the flux. Nearly stoichiometric (LaK)MnO3 with 33 % of Mn4+ concentration could be prepared at temperature as low as 750 °C. Composition of all the phases have been obtained from the chemical analysis of the elements present. |
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