Microstructures, defect characteristics, optoelectronic, and magnetic properties of polycrystalline delafossite Cu_1-xCa_xFeO₂ (x = 0.00–0.08) samples have been systemically investigated. Our investigation results distinctly show that divalent Ca²⁺ ions can successfully substitute partial Cu⁺ ions and prompt the grain size and induce the partial Fe³⁺ valence variation to Fe²⁺. The positron annihilation lifetime spectra signifies that the cation vacancy clusters exist in all samples, the size and concentration of vacancy defects are redistributed with increasing Ca²⁺ ions content, while the overall defect environment of CuFeO₂ system is not changed. The Hall-effect measurement results indicate the transition of semiconductor type from p-type to n-type. The UV–Visible absorption spectroscopy results indicate that the calculated band gap of the prepared samples is estimated to be 3.42–3.58 eV, indicating the series can be applied to the transparent conductive oxide materials. The magnetic measurements reveal that the transition temperature T_N1 and T_N2 are independent of Ca²⁺ content x, while the coexistence of antiferromagnetism and weak ferromagnetism for all the doped samples are observed. A moderate Ca²⁺ content, i.e. x = 0.02, can distinctly promote weak ferromagnetism. The above internal mechanism is probably relevant to the evolution of lattice structure and defect characteristics caused by Ca²⁺ ions doping.

 已经系统地研究了多晶铜铁矿Cu _{1- x} Ca _x FeO ₂（x = 0.00-0.08）样品的微观结构，缺陷特征，光电和磁性。我们的研究结果清楚地表明，二价Ca ²⁺离子可以成功替代部分Cu ⁺离子，并促进晶粒尺寸并引起部分Fe ³⁺价态变化为Fe ²⁺。正电子an没寿命谱表明，所有样品中均存在阳离子空位簇，空位缺陷的尺寸和浓度随着Ca ^2+的增加而重新分布。离子含量，而CuFeO ₂系统的整体缺陷环境没有改变。霍尔效应测量结果表明半导体类型从p型过渡到n型。紫外可见吸收光谱法的结果表明，所制备样品的计算带隙估计为3.42-3.58 eV，表明该系列可应用于透明导电氧化物材料。磁性测量表明，转变温度T _N1和T _N2与Ca ²⁺含量x无关，而对于所有掺杂样品，均观察到反铁磁性和弱铁磁性的共存。中度Ca ²⁺含量，即x  = 0.02，可以明显促进弱铁磁性。上述内部机理可能与Ca ²⁺离子掺杂引起的晶格结构演变和缺陷特性有关。