ChemInform Abstract: Synthesis and Structure of the Double Polyphosphate NaEr(PO3)4.

Abstract

The title compound is prepared from a mixture of Na2CO3, Er2O3 and H3PO4, which is heated to 500 °C for seven days.

31P MAS-NMR Study of Some Alkali Rare-Earth Cyclo- and Polyphosphates

“…The chains are not helical, but festoon-like, with a zig-zag in the b-c plane. 27,28 The space group of these phosphates is P2 1 /n, and there are four independent tetrahedral sites for P atoms in the unit cell. In agreement with this fact, 31 P MAS-NM R spectra of the four phosphates analyzed are formed by four com ponents with similar intensities (see Fig.…”

“…On the basis of the structural data published, one type of cyclophosphate (type A) and ve types of polyphosphate (types I, II, III, IV, and X) described by Palkina et al have been studied. 8,9 Isostructural com pounds, whose re ned structures display the unit cell parameters nearest to those of the compounds analyzed, were used as references (last column of Table I [25][26][27][28][29][30][31][32][33][34] ).…”

Sodium terbium(III) polyphosphate

“…All NaLn(PO 3 ) 4 polyphosphates reported up to now, where Ln is a trivalent rare earth element, belong to type II of longchain polyphosphates A I B III (PO 3 ) 4 . For corresponding isotypic crystal structures, see: El Masloumi et al (2005) and Zhu et al (2006) for Ln = La; Zhu et al (2008) for Ce and Eu;Horchani-Naifer et al (2009) for Pr; Koizumi et al (1976) for Nd; Amami et al (2005) for Gd; El Masloumi et al (2008) for Y; Amami et al (2004) for Ho; Maksimova et al (1988) for Er. For other isotypic polyphosphates with general composition A I B III (PO 3 ) 4 , see: Linde et al (1983) for AB = KCe; Naïli et al (2006) for AgGd; Belam et al (2007) and Jaoudi et al (2003); for NaBi.…”

“…It is now well established that long-chain polyphosphates with general formula A I B III (PO 3 ) 4 can be divided in seven structural types (Jaoudi et al, 2003). All long-chain polyphosphates of formula NaLnP 4 O 12 (Ln = rare earth element) reported up to now ( El Masloumi et al 2005;Zhu et al 2006;Zhu et al 2008;Horchani-Naifer et al 2009;Koizumi et al 1976;Amami et al 2005;El Masloumi et al 2008;Amami et al 2004;Maksimova et al 1988) belong to the structural type II which has been first described on basis of the KCe(PO 3 ) 4 structure (Linde et al, 1983). A few other A I B III cationic combinations such as AgGd (Naïli et al 2006) and NaBi (Jaoudi et al 2003;Belam et al 2007) also lead to polyphosphates which belong to the structural type II.…”

Investigation of phase equilibria in the Er2O3–Na2O–P2O5 system: the partial system ErPO4–NaPO3–Er(PO3)3

“…It crystallizes in the monoclinic system (space group P21/n, lattice parameters a = 7.155 (15), b = 12.9870(70), c = 9.662(32) Å , b = 89.32(2)° [21]). NaEr(PO 3 ) 4 , according to its stoichiometric composition, should occur as an intermediate compound in the subsystem Er(PO 3 ) 3 -NaPO 3 , with the molar ratio of the starting metaphosphates equal to 1:1.…”