Journal of thermal analysis

, Volume 50, Issue 1–2, pp 63–71 | Cite as

Ternary molybdenum(III) chlorides

  • F. Beier
  • H. J. Seifert


The phase diagrams of ACl/MoCl3 (A=Na, K, Rb, Cs) were elucidated by DTA measurements in sealed quartz ampoules in the range of 0–40 mol% MoCl3. The samples were prepared from alkali metal chlorides and the compounds A3MoCl6 or A3Mo2Cl9. The 3∶1 compounds withA=Na, Rb, Cs were obtained by sintering mixtures of 3ACl+MoCl3; the enneachlorides A3Mo2Cl9 withA=K, Rb, Cs were precipitated from solutions of MoCl3·3H2O and ACl in formic acid. Congruently melting compounds A3MoCl6 exist in all four systems, incongruently melting enneachlorides A3Mo2Cl9 in systems withA=K, Rb, Cs. Still unknown structures were determined by analog-indexing powder patterns according to known structure families. Especially Cs3MoCl6 is isotypic with the recently found Cs3CrCl6 structure. Additionally, the unit cell parameters were determined for the compounds A3MoCl5·H2O (A=K, Rb, Cs) analogous to Cs2TiCl5·H2O, whose structure was determined by single crystal measurements.


crystal structures phase diagrams of systems ACl/MoCl3 from 0–40 mol% MoCl3 preparation of A3Mo2Cl9 from formic acid 


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Copyright information

© Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest 1997

Authors and Affiliations

  • F. Beier
    • 1
  • H. J. Seifert
    • 1
  1. 1.Inorganic ChemistryUniversity Gh KasselGermany

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