The crystal structure of KTiPOs, determined by a simultaneous use of the tangent-formula method and the Patterson method, is described in space group Pn2ia. Lattice constants are: a = 12.814 Â, b = 10.616 Â, c = 6.404 Â. This compound is a monophosphate whose chemical formula must be written KTiOPOj. Distorted Ti06 groups have a short Ti-O distance. Auszug Die Kristallstruktur von KTiPOs wurde mit einer direkten Methode und der Methode von Patterson bestimmt. Die Raumgruppe ist Pn 2ia. Die Gitterkonstanten sind: a = 12,814 Â, b = 10,616 Â, c = 6,404 Â. Es wird festgestellt, daß die Verbindung ein Monophosphat ist: die chemische Formel ist also KTiOPOi zu schreiben. Das unabhängige Sauerstoffatom, sehr nahe am Titanatom, bewirkt die Deformierung des TiOe-Oktaeders.Résumé La structure cristalline de KTiPOö a été déterminée à l'aide d'une méthode directe et de la méthode de Patterson. Le groupe spatial est Pn2ia, les paramètres de maille sont: a = 12,814 Â, b = 10,616 Â, c = 6,404 Â. Il est établi que ce composé est un monophosphate : la formule chimique s'écrit donc

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.

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Abstract. M r= 645.4, orthorhombic, Pbca, a = 18.820(4), b= 10.89 (3), c= 13.925 (3) A, V= 2853.9 A 3, Z = 16, D x = 6.00 gcm -3, 2(Ag Ka) = 0.5608 A, ~ = 6.76 cm -1, F(000) = 4640, room temperature. R = 0.048 for 2028 independent reflexions. This structure may be described as the c.c.p, silvermetal structure in which some silver atoms are replaced by V20 7 groups and others are shifted. This is supported by the Ag-Ag distances in their distorted hexagonal network: 2.989 < d (:k) < 3.206.

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