Аннотация
The search for compounds with the formula composition KBaR(BO 3 ) 2 has been performed by solid-phase synthesis and differential thermal analysis. The compounds synthesized in this series are KBaPr(BO 3 ) 2 and KBaNd(BO 3 ) 2 , which are isostructural to KBaY(BO 3 ) 2 , are isotypical to butschliite K 2 Ca(CO 3 ) 2 , and crystallize in a trigonal system with space group R 3 m . The structural characteristics of compounds calculated for the entire series of REEs are given.