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Meet the Cerium(IV) Phosphate Sisters: CeIV(OH)PO4 and CeIV2O(PO4)2

“…In 1975, Herman and Clearfield [18] suggested the existence of af amily of cerium(IV) basic hydrogenphosphates with the general formula Ce(OH) x (PO 4 ) x (HPO 4 ) 2À2x .T he limiting member of this family (x = 1) should be ceric basic phosphate, Ce(OH)(PO 4 ), however,a ccording to Herman and Clearfield, [18] the compositiono ft his compound corresponds to the formula Ce(OH) 0.7 (PO 4 ) 1.1 .A ni denticalc ompoundw as apparently obtained by Hayashi et al [19] At the same time, in the later works of Nazaraly et al, [20] it was shown that the composition of the compound Ce(OH) 1.62 (NH 4 HPO 4 ) 0.35 (H 2 PO 4 ) 0.68 (PO 4 ) 0.45 •0.6 H 2 O, determined by Herman and Clearfield, [18] was erroneous, which casts doubt on the other conclusions of these authors' work. [18] It is worth noting that the existence of Ce(OH)PO 4 was also assumed by Lebedev and Rudenko [21] and Tananaev et al [22] Hayashi et al [23] synthesized crystallinec erium(IV) hydroxidophosphate with the compositionCe(HPO 4 )(PO 4 ) 0.5 (OH) 0.5 ,but Nazaraly et al [24] reliably provedt hat this compound's composition is actually Ce(PO 4 )(HPO 4 ) 0.5 (H 2 O) 0.5 .…”

“…At the same time, in the later works of Nazaraly et al., it was shown that the composition of the compound Ce(OH) 1.62 (NH 4 HPO 4 ) 0.35 (H 2 PO 4 ) 0.68 (PO 4 ) 0.45 ⋅ 0.6 H 2 O, determined by Herman and Clearfield, was erroneous, which casts doubt on the other conclusions of these authors’ work . It is worth noting that the existence of Ce(OH)PO 4 was also assumed by Lebedev and Rudenko and Tananaev et al . Hayashi et al .…”