A new kind of nanoscaled composite oxide powders was prepared by a sol-gel combustion method to study the effect of doping on the infrared radiation. When calcined at 1100-1200 ℃, anatase, zircon and cordierite phases were crystallized in the resultant composite powders, proved from XRD patterns. The micro structural features and infrared emission performance were observed and measured by TEM and IR spectrome ter. The infrared emission performance of the powder-packed disk samples showed a higher emissivity in a wide infrared range of 1-22 μm. The infrared emission peak appeared at about 10 μm with a maximal value of 98%. With the doping of Ni2+ and Fe2+ , the infrared emission intensity increased obviously, due to the enhancement of anharmonic interaction, causing lattice deformation of the substituted cordierite structure.%通过多相成分分析,以镁铝硝酸盐、正硅酸乙酯、钛酸四丁酯和氧氯化锆等为原料,采用溶胶-凝胶燃烧法合成了新型复相氧化物粉体,研究了Ni和Fe离子掺杂及粉体细化对红外辐射率的提高及波段宽化的影响.XRD物相分析发现,在1100～1200℃范围内煅烧可获得结晶良好的氧化物粉体,该粉体的结构为堇青石及金红石等多相结构.采用碳酸氢铵为pH调节剂与使用氨水相比,粒子中位粒径有显著减小.红外辐射性能显示,在1～ 22 μm的宽波段内,该复合粉体均具有很高的红外发射率,在10μm附近其红外发射率达到98％.同时Ni及Fe离子的掺杂及粉体细化可引起堇青石晶格畸变,增强了材料的非简谐效应,从而有 利于复合粉体红外辐射率的提高.
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