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首页> 外文期刊>RSC Advances >Sol-gel synthesis of transition-metal ion conjugated alumina-rich mullite nanocomposites with potential mechanical, dielectric and photoluminescence properties
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Sol-gel synthesis of transition-metal ion conjugated alumina-rich mullite nanocomposites with potential mechanical, dielectric and photoluminescence properties

机译：具有潜在的机械，介电和光致发光性能的过渡金属离子共轭富铝富铝红柱石纳米复合材料的溶胶-凝胶合成

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摘要

Nanocrystalline mullite have been synthesized from non-stoichiometric alkoxide precursors via sol-gel route with Co2+, Ni2+ and Cu2+ as dopant metal ions. Transition-metal aluminate spinel phases, formed from the reaction between dopant metal ions and dissolved alumina species, introduced prominent colors to the composites after sintering. Interesting colors combined with suitable densification lead these composites to have potential use as ceramic pigments. A comparative Vickers and Knoop hardness have been evaluated in terms of dislocation movement along grain boundaries with highest hardness and Young's modulus values of similar to 8.7 GPa and similar to 207 GPa for copper and cobalt incorporated mullite, respectively. Greater porosity of pure mullite results in an unconventionally high dielectric constant of similar to 91 whereas larger interfacial polarization is responsible for the varying dielectric response of transition-metal incorporated mullite composites. Formation of oxygen like defects in the composites cause prominent PL bands with highest PL intensity for dopant cobalt ions in mullite matrix.
机译：纳米晶莫来石是由非化学计量的醇盐前体通过溶胶-凝胶途径合成的，其中Co2 +，Ni2 +和Cu2 +为掺杂金属离子。由掺杂金属离子与溶解的氧化铝物质之间的反应形成的过渡金属铝酸盐尖晶石相在烧结后为复合材料引入了显着的颜色。有趣的颜色加上合适的致密化使得这些复合材料具有用作陶瓷颜料的潜在用途。对于沿晶界的位错运动，以铜和钴结合的莫来石的最高硬度和杨氏模量值分别接近8.7 GPa和207 GPa时，评估了比较的维氏硬度和努氏硬度。纯莫来石的较高孔隙率导致与91相似的非常规高介电常数，而较大的界面极化是过渡金属结合莫来石复合材料变化介电响应的原因。复合材料中像氧气一样的缺陷的形成会导致富铝红柱石基质中掺杂钴离子具有最高PL强度的突出PL带。

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