纯六方相氮化铝泡沫材料的合成

在15 mL的不锈钢反应釜中，利用无水三氯化铝与叠氮化钠在无溶剂的条件下直接反应，合成出了六方结构氮化铝泡沫材料，反应温度650 ℃，反应时间3 h.扫描电子显微镜测试结果显示，该试样呈现泡沫状外貌特征.X射线衍射结果表明该试样为六方结构.不同温度条件下的吸收谱表明在202 nm附近存在尖锐的吸收峰.红外吸收谱中存在1381 cm^-1和730 cm^-1两个吸收峰.同时，提出了六方结构氮化铝泡沫材料的合成机理. 关键词： 六方氮化铝泡沫材料 合成机理 X射线衍射

Synthesis of pure hexagonal phase aluminium nitride foam

In a stainless steel autoclave of 15 ml capacity, pure hexagonal aluminum nitride （h-AlN） foam has been synthesized by direct reaction of AlCl₃ with NaN₃ in non-solvent system at 650 ℃ for 3h. The scanning electron microscopy （SEM） shows that the obtained foam material has characteristic sponge-like morphology. The results of X-ray diffraction （XRD） indicate that the AlN foam has a pure hexagonal structure. The absorption spectra at various temperatures indicate that there is a relatively strong absorption peak at about 202 nm. The infrared absorption spectrum shows that the foam has two absorption peaks, centered at 1381 cm^-1 and 730 cm^-1 respectively. In addition, a possible synthesis mechanism for h-AlN foam is discussed.