STUDY OF THE KPO3-SM(PO3)3 SYSTEM AND KSM(PO3)4 CONDENSED POLYMORPHIC PHASES

The KPO//3-Sm(PO//3)//3 system has been studied for the first time by mu -DTA, X-ray diffraction and IR spectroscopy. The only compound observed within the system was KSm(PO//3)//4 melting incongruently. An eutectic appears at 14 mole% Sm(PO//3)//3 at 937 K; the peritectic occurs at 1133 K; transition was observed at 717 K for KPO//3. Preparation of single crystals leads to three monoclinic polymorphs. The chemical preparation, crystallographic data, and IR spectra for the various compounds are given.