Editorial: The June 2023 cover paper.

The paper uses X-ray diffraction (XRD) at different temperatures and both imaging and X-rays energy-dispersive spectroscopy (XEDS) in the SEM to examine changes that occur in this high-entropy oxide. The paper was handled by David Cann, one of our Editors whose own research emphasizes ceramics; it is entitled "Phase equilibria and metastability in the high-entropy A SB 6 sb B SB 2 sb O SB 17 sb oxide family with I A i = Zr, Hf and I B i = Nb, Ta." The paper is essentially a classical study of a ceramic material with the twist that these high-entropy ceramics had not been recognized as such until quite recently. [Extracted from the article]