CAJ | 학술논문

采用溶胶.凝胶法制备了铜铁矿结构CuxAlO2陶瓷体材.当1≤x＜1.04时,样品为纯铜铁矿相,当x≥1.04时,样品中出现了微弱的CuO相.样品Cu1.04AlO2的室温电导率比名义组分CuAlO2大了近一个数量级.研究表明,替位式缺陷CuAl(Cu2+离子取代Al3+离子)是导致电导增加的主要受主缺陷机制,Cu过量CuxAlO2的分子式可更准确地表示为Cu(Al1-yCuy)O2.
채용용효.응효법제비료동철광결구CuxAlO2도자체재.당1≤x＜1.04시,양품위순동철광상,당x≥1.04시,양품중출현료미약적CuO상.양품Cu1.04AlO2적실온전도솔비명의조분CuAlO2대료근일개수량급.연구표명,체위식결함CuAl(Cu2+리자취대Al3+리자)시도치전도증가적주요수주결함궤제,Cu과량CuxAlO2적분자식가경준학지표시위Cu(Al1-yCuy)O2.
Cu-excess CuxAlO2 ceramics with delafossite phases were synthesized using sol-gel. In the composition range of 1≤x＜1.04, there are no detectable non-delafossite phases. Weak diffraction peaks of CuO are observed when x≥1.04.The room temperature conductivity of the Cu1.04AlO2 sample is improved by nearly an order of magnitude over that of the CuAlO2 sample. The major defect mechanism responsible for the conductivity enhancement is proposed to be substitution defects of CuAl (Cu2+ ions substitute Al3+ ions). The composition formula unit for Cu-excess CuxAlO2 may be expressed as Cu(Al1-yCuy)O2.