本文论述了制备高温红外辐射导电材料的基本原理，并据此选定以铬酸镧为基质，再掺入合适的杂质。
According to the principle of making high temperature conductive infrared radiation materials, Lanthanum Chromate, doped with appropriate impurities, was selected.
矿物晶体中所含杂质的种类和含量多少决定矿物的导电类型。
The conduction types of minerals are determined by the types and the contents of impurities in crystals.
采用高纯铝加单一杂质元素的方法，研究了硼对含铁铝、含硅铝导电性的影响。
Effects of B on the electric conductivity of Fe or Si containing aluminum were examined.
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