Na3M(OH)(HPO4)(PO4),M=Al, Ga: Two Phosphates with a Chain Structure

Kwang Hwa Lii, Sue Lein Wang

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Crystals of two phosphates, Na3Al(OH)(HPO4)(PO4) and Na3Ga(OH)(HPO4)(PO4), were grown by a high-temperature, high-pressure hydrothermal method and structurally characterized by single-crystal X-ray diffraction. Na3Al(OH)(HPO4)(PO4) is in the monoclinic system, space groupC2/m(No. 12), witha=15.277(2),b=7.0540(9),c=7.0405(9) Å, β=96.730(2)°,V:753.5(3) Å3,Z=4 andR=0.0357 Na3Ga(OH)(HPO4)(PO4) is as described above excepta=15.4319(1),b=7.1637(3),c=7.0565(2) Å β=:96.637(2)°,V:774.86(4) Å3, andR=0.0227. The two compounds are isostructural. The structure consists of infinite chains oftrans-corner-sharingMO5(OH)(M=Al, Ga) octahedra running parallel to thebaxis. Adjacent octahedra are bridged by HPO4and PO4groups to form1[M(OH)(HPO4)(PO4) 3-] chains, which are linked together by 6-, 5-, and 8-coordinated Na+ions. Hydrogen bonding also contributes to the linkage of these chains. The composition ofNa3Al(OH)(HPO4)(PO4) was further defined by thermogravimetric analysis. The structure is compared with that of Na4Al(OH)(HPO4)(PO4)2.

Original languageEnglish
Pages (from-to)21-26
Number of pages6
JournalJournal of Solid State Chemistry
Issue number1
StatePublished - Jan 1997


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