SHS of a superoxide in the Na-Fe-Y-O system

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• 作者：Yu. G. Morozov (1) morozov@ism.ac.ru
  T. I. Ignat鈥檈va (1)
  O. V. Belousova (1)
  M. V. Kuznetsov (2)
• 关键词：SHS &#8211 ; Na ; Y ; Fe ; O system &#8211 ; NaFeYO7 + x &#8211 ; magnetic properties &#8211 ; thermal stability
• 刊名：International Journal of Self-Propagating High-Temperature Synthesis
• 出版时间：September 2011
• 出版年：2011
• 期刊代码：pc344_1061-3862
• 类别：ch
• 卷：20
• 期：3
• 页码：166-171
• 数据来源：sp

摘要

For the first time, complex oxide NaFeYO_{7 + x} was prepared by SHS (T _c = 750–1200 K, U = 1–4 mm/s) in the Na-Fe-Y-O system. Explored was the influence of reagents ratio on combustion limits for the mixtures under study. Combustion products were characterized by XRD, SEM, EDX, chemical analysis, and magnetic measurements. Single-phase NaFeYO_{7 + x} was obtained at an excess of sodium in green mixtures. To stabilize the product, the water-washing procedure was used just after synthesis. The synthesized material has a cubic crystal structure with a cell parameter close to that of sodium yttrate NaYO₂, it exhibited very weak magnetic properties, and overly-stoichiometric oxygen content. The product is heat resistant up to 450 K. The synthesized product is a new inorganic superoxide with good technological perspectives for use as a solid oxygen-containing material.