Fabrication and characterization of (Mg1−xFex)O (0.05≤x≤0.25) ceramics
Fabrication and characterization of (Mg1−xFex)O (0.05≤x≤0.25) ceramics
复制标题
(Mg1−xFex)O (0.05≤x≤0.25)陶瓷的制备与表征
DOI：
10.1016/j.ceramint.2014.11.002
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发表时间：
2015
影响因子：
5.2
通讯作者：
C. Song
中科院分区：
文献类型：
--
作者：
Shen Li;X. Qin;Yuanyue Li;C. Song
Highly dense (Mg1−xFex)O (0.05≤x≤0.25) ceramics (relative density >98%) were prepared by ultrasonic assisted oxalate co-precipitation method together with spark plasma sintering. Mechanical measurements indicate that Young’s modulus decreases monotonously from 312 to 268.5±5.2 GPa with increasing Fe contentxfrom 0 to 0.25. In contrast, the Vickers hardness first increases from 6.8 to 8.50±0.11 GPa asxincreases from 0 to 0.1, and then decreases monotonously with further increasingx. The increase and decrease in the hardness withxcan be mainly attributed to the solid solution strengthening and weakening of Peierls–Nabarro stress, respectively. Thermal analyses reveal that heat capacityCpdecreases (from 0.896±0.018 to 0.816±0.016 (J K)−1g−1at 323 K, for instance) with increasingx(from 0.05 to 0.25) due to the lowerCpof FeO. Similarly, thermal conductivityκof the samples decreases (say, from 24.8±1.0 to 3.7±0.1 (W K)−1m−1at 323 K) with the increasingx(from 0.05 to 0.25), which could be ascribed to the decreasing melting point and increasing mean atomic weight resulting from substitution of Mg for Fe.
