Abstract

Nanopowders of two crystalline phases, magnesium–aluminum spinel (98 wt %), and cuprite (2 wt %) have been obtained by laser evaporation of a solid target, which is a mechanical mixture of simple oxides (MgO, Al₂O₃, CuO). These nanopowders have been used to prepare test samples of transparent Cu:MgAl₂O₄ ceramics, the IR transmission spectra of which revealed two new strong absorption bands at λ₁ ≈ 1.55 (1.45) μm and λ₂ ≈ 3.45 (3.03) μm, corresponding to transitions between the Stark levels ²E(\({\text{t}}_{2}^{6}\)e³) and ²T₂ (\({\text{t}}_{2}^{5}\)e⁴) of Cu²⁺ ions in octahedral and tetrahedral positions, respectively.

中文翻译：

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铜活化的镁铝纳米粉体和陶瓷的合成与研究

摘要

通过激光蒸发固体靶材获得了两个晶相的纳米粉，镁铝尖晶石（98重量％）和铜盐（2重量％），这是简单氧化物（MgO，Al ₂ O ₃， CuO）。这些纳米粉末已被用于制备透明的Cu测试样品：镁铝₂ Ó _4个陶瓷，红外透射光谱，其中揭示了两个新的强吸收带在λ ₁  ≈1.55（1.45）微米和λ ₂ ≈3.45（3.03）以下，对应于Stark级别² E（\（{\ text {t}} _ {2} ^ {6} \） e ³）和² T ₂（\（{\ text {t}} _ {2} ^ {5} \） e ⁴）分别位于八面体和四面体位置的Cu ²⁺离子。