Phase formation in the ZrO(NO3)2-H3PO4-RbF-H2O system: the PO 4 3− /Zr = 0.5 section

Phase formation along sections of the HfO(NO3)2-H3PO4-RbF-H2O system

“…Two absorption bands in the range of ν(OH) vibrations and a split band assigned to δ(H 2 O) are indicative of the presence of water molecules of two types. Phase II is isostructural to the zirconium com pound RbZrF 2 PO 4 · 0.5H 2 O, which was isolated both at = 1-2 and at = 0.5, but in the lat ter case, the composition was not determined (phase y) [4,5]. Phase II is also isostructural to α CsZrF 2 PO 4 ⋅ 0.5H 2 O [13].…”

“…These crystals are isos tructural to an analogous zirconium compound and were therefore assigned a similar composition [4]. The product of calcination at 980°С is a mixture of Rb 3 HfF 7 , HfO 2 , and an amorphous phase, probably, rubidium phosphate hafnate.…”

“…Increased attention is given to the synthesis of com plex phosphates with different anions in which anions are combined with fluoride ions [1]. The data on such zirconium compounds are available in the liter ature [2][3][4][5]. By studying the system ZrO(NO 3 ) 2 -H 3 PO 4 -RbF-H 2 O, the following compounds were iso lated: crystalline rubidium fluorophosphate zirconates Rb 3 Zr 3 (PO 4 ) 5 ⋅ 3HF, RbZrF 2 PO 4 ⋅ 0.5H 2 Taking into account the similarity of the chemical properties of zirconium and hafnium, we might expect the formation of rubidium fluorophosphates hafnates.…”