A simple formula without any free parameter is established to estimate surface energies of elemental metals of low-index surfaces, which is developed by modifying the classic broken-bond rule. The predicted results of the formula for 52 A1–A4 and sc elemental crystals are in agreement with experimental results and the first-principles calculations although deviations are present for several divalent sp metals.

A precursor to LaFe, -, Co, O, has been prepared using the polyethylene glycol-gel method. After calcination of the precursor at 450-550 "C for 1-2 h, nanocrystalline complex oxides LaFe,-,Co,O, (y=O.5, 0.6, 0.8) with the perovskite structure and grain diameter

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A series of AlCrCoNiFe based alloys with equal percentage of principal components (high-entropy alloys or HE alloys) is fabricated. The related crystalline structures of the alloys are measured and calculated. Results show that the formed bcc phase is a compound based B2 structure where there is partial ionic bonding between Al and other transition metals. Thus, the bcc structure of the alloys should be a B2 instead of an A2 due to the large difference in electronegativities among the components consisting of the HE alloys.