Novel high‐entropy carbide ceramics (HEC) containing rare earth metals, namely (Ti, Zr, Hf, Ta, La, Y)C, (Ti, Zr, Hf, Ta, Nb, La, Y)C, and (Ti, Zr, Hf, Ta, Nb, Mo, W, La)C were prepared with single‐phase structure by polymer precursor method. Controlled co‐hydrolysis and polycondensation of equiatomic metal‐containing monomers were conducted successively, followed by blending allyl‐functional novolac resin as carbon source, and the polymer precursors were obtained as clear viscous liquid solutions. The single‐phase formation possibility was theoretically analyzed from the aspects of size‐effect parameter δ of the designed compositions. All as‐obtained ceramics possessed single face‐centered‐cubic structure of metal carbides and high‐compositional uniformity from nanoscale to microscale. The (Ti, Zr, Hf, Ta, Nb, Mo, W, La)C ceramic powder pyrolyzed at 1800°C exhibited low‐oxygen impurity content of 1.2 wt%. Thus, multicomponent high‐entropy carbide nanoceramics with over five metal elements containing even rare earth element were firstly synthesized and characterized.

中文翻译：

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通过液态聚合物前体路线合成含稀土的单相多组分金属碳化物

包含稀土金属（Ti，Zr，Hf，Ta，La，Y）C，（Ti，Zr，Hf，Ta，Nb，La，Y）C和（Ti的新型高熵碳化陶瓷（HEC）通过聚合物前驱体方法制备了具有单相结构的Zr，Hf，Ta，Nb，Mo，W，La）C。依次进行含金属等原子金属的单体的受控共水解和缩聚反应，然后将烯丙基官能酚醛清漆树脂作为碳源进行共混，得到的聚合物前体为透明粘稠液体溶液。从尺寸效应参数δ的角度理论分析了单相形成的可能性设计的成分。所有获得的陶瓷都具有金属碳化物的单面中心立方结构和从纳米级到微米级的高成分均匀性。在1800°C下热解的（Ti，Zr，Hf，Ta，Nb，Mo，W，La）C陶瓷粉末的低氧杂质含量为1.2 wt％。因此，首先合成和表征了具有超过五种甚至含有稀土元素的金属元素的多组分高熵碳化纳米陶瓷。