Abstract
The subsolidus phase relations of the system Y 2O 3–CaO–B 2O 3 are investigated by means of X-ray diffraction (XRD) analyses. There are six binary compounds and three ternary compounds in this system. The phase diagram comprises 13 three-phase regions. The ternary compound CaYBO 4 is refined from powder XRD data by the Rietveld method. It has a warwickite-like structure with cell parameters a=10.4354(3) Å, b=9.6126(2) Å, c=3.5880(1) Å and space group Pnam. The rationality of the CaYBO 4 structure is examined by Brown bond valence model and IR spectra.
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