Experimental studies on compounds of alkali and alkaline earth metals with semi-and metametals have considerably broadened the basis for a discussion of the transition from metallic to ionic bonding. Current interest is focused mainly upon the elucidation of the principles governing the structure of such compounds which are subject to a wide range of variation within this class of materials. A new definition of the term Zintl phase is proposed after consideration of available findings.
Vertex‐sharing BO4 and PO4 tetrahedra form the framework of the title compounds. Ca[BPO5] and Sr[BPO5] crystallize in the stillwellite structural type and contain tetrahedral chain anions [BPO], which can be described as loop‐branched “dreier” single chains. In Ba3[BP3O12] the tetrahedral anions form “zweifach” open “vierer” single chains. Given these results and the known linking modes of tetrahedral units, it is expected that borophosphates with layered and framework structures, as well as microporous structures, can be found.
Durch die experimentelle Untersuchung der Verbindungen der Alkali-und Erdalkalimetalle mit den Halb-und Metametallen des Periodensystems ist die stomiche Basis zur Diskussion des Ubergangs von der Metall-zur Ionenbindung wesentlich verbreitert worden. Das Hauptaugenmerk liegt gegenwartig auf der Aufklarung 'der Bauprinzipien solcher Verbindungen, welche in dieser Stofklasse sehr variationsreich sind. Anhand der bisher vorliegenden Befunde wird eine neue Definition des Begriffs der Zintl-Phasen vorgeschlagen.
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