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The pyrochlore-type rare-earth oxides attract considerable attentions due to their outstanding properties and extensive applications. In this work, contour maps of mechanical/thermal properties as a function of A and B cation radii across a wide variety of A 2 B 2 O 7 (A = La-Lu and Y; B = Ti, Sn, Hf, Zr, Pr and Ce) pyrochlore oxides are studied using the first-principles calculations. The mechanical/thermal properties vary dramatically with increasing of the B cation sizes but do not show a strong systematic dependence on the A cation sizes. Furthermore, the machine learning algorithm is performed for the large family of pyrochlores and the parameters playing key role on mechanical/thermal properties are clarified. Besides, the expressions of focused mechanical and thermal properties are constructed. These results are expected to guide the future material design through composition tailoring. K E Y W O R D Sfirst-principles calculations, mechanical properties, pyrochlore, thermal conductivity

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The developed microelectronic devices and high‐mobility warfare put forward great requirements for electromagnetic absorption materials. Herein, porous PANI/SBA‐15 composites are successfully prepared by the in situ chemical oxidative polymerization method. On the basis of the SBA‐15 porous framework, highly conductive PANI acts as the major absorbent to achieve compatible lightweight and EM absorption. The results imply that the absorbing capacity of the PANI/SBA‐15 composites can be effectively controlled by modulating the amount of PANI. Finally, ascribing to the suitable coupling effect between impedance matching and loss properties, the PANI/SBA‐15 composite with 0.35 mL aniline monomer exhibits the optimal EM absorption performance with a minimum reflection loss of −54.20 dB at a matching thickness of 2.4 mm. Besides, the maximum effective absorption bandwidth is up to 6.00 GHz at 2.15 mm, indicating the bright application prospects in both civilian and military fields.