High‐entropy transparent fluoride laser ceramics

Abstract For the first time, a transparent high‐entropy fluoride laser ceramic has been prepared and characterized. X‐ray diffraction (XRD) analysis of a CeNdCaSrBaF 12 (CNCSBF) transparent ceramic consolidated by vacuum hot pressing (VHP) reveals that Ce 3+ , Nd 3+ , Ca 2+ , Sr 2+ , and Ba 2+ have formed a single‐phased fluorite solid solution, with a lattice constant of 5.826 Å. Bulk density measurements produced a value of 6.15 g/cm 3 . Scanning electron microscopy (SEM) analysis of the ceramic revealed a uniform distribution of grain sizes in the material, with the average grain size being approximately 20 μm. The material exhibits a maximum in‐line transmittance of approximately 60% at 1000 nm. A near‐infrared range photoluminescence (PL) emission band was observed at 1057 nm, with a visible‐range PL emission band being located at 440 nm.