Structure cristalline de polyphosphate de lithium LiPO3

Abstract

The crystal structure of lithium polyphosphate, LiPO3, has been solved with 3487 independent reflexions. The unit cell is monoclinic with a = 16.453 (2), b = 5"405 (1), c = 13"086 (2) A, 8= 98.99 (2) ° and Z= 20; space group In. The final R for all observed reflexions is 0.034. The main characteristic of this arrangement is a (POa) chain with a period of ten tetrahedra in the [10T] direction.

On the existence of low- and high-temperature crystal forms of lithium polyphosphate

“…1 and Table 1 to enable identification of the samples. The crystal structure solved by Guitel & Tordjman (1976) agrees only with that of our data of the hightemperature form. Crystals grown by crystallization during polymerization at 513 K have a distinctly different X-ray diffraction pattern from those grown at, for example, 723 K. Differential thermal analysis (DTA) of the low-temperature form, however, did not show the expected crystal-crystal transition at about 523 K on heating.…”

“…A comparison of the Debye pattern with calculated spacings of the LiPO 3 structure of Guitel & Tordjman (1976) shows that these authors analyzed the high-temperature crystal form (see Table I, 22 reflexions, average error"-0.002, standard deviation +0.014 /k) {monoclinic, a ---16.453, b = 5.405, c = 13.086 A, fl= 98.99 °, Z = 20, density --2.482 Mg m-a; chain axis along [10il with a five-PO~-tetrahedra repeat length of 9.678 /k}. The average P-P distance of adjacent PO~-tetrahedra within the chain is 2.94 A.…”

“…Detailed crystal structure determinations of other selected polyphosphates were made later by Corbridge (1956) and Jost (1961Jost ( , 1963Jost ( , 1964. A crystal structure of LiPO 3 was studied by Grenier & Durif (1973) and finally solved by Guitel & Tordjman (1976). Recent investigations of ours into crystallization during polymerization resulted in a detailed description of the nucleation of lithium polyphosphate crystals by oligophosphates, their growth mech- anism by dimer addition, and the crystallization and melting of prepolymerized polymer molecules (Benkhoucha & Wunderlich, 1978a,b,c).…”

Subsolidus phase relations of the ZnO–Li2O–P2O5 system

“…Three compounds were reported in this system with the Li 2 O:P 2 O 5 molar ratios of 1:1 (LiPO 3 ), 2:1 (Li 4 P 2 O 7 ) and 3:1 (Li 3 PO 4 ) [16][17][18][19][20][21][22][23][24][25][26][27][28]. Table 1 Crystallographic data of the binary and ternary compounds in the ZnO-Li2O-P2O5 system obtained in this work, in comparison with the reports in the literature.…”

Crystal Structure and Cation Transport Properties of the Layered Monodiphosphates: Li9M3(P2O7)3(PO4)2(M=Al, Ga, Cr, Fe)

“…The X-ray powder diffractograms of the resulting solids revealed the presence of the low-temperature form of Li P O (15) and of the high-temperature form of LiPO (16,17) together with Li…”