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Single crystals of the title compounds are grown from melts of M2MoO4 (M: Rb, Cs) and MoO3 (823 K resp. 693 K, 24 h). Rb2Mo2O7 crystallizes in the orthorhombic space group Ama2 with Z = 8 and Cs2Mo2O7 is monoclinic, space group P21/c, Z = 8. The compounds have new structure types containing infinite chains of MoO4 tetrahedra and MoO6 octahedra. The chains in Cs2Mo2O7 resemble those in the Na2Mo2O7 structure. The orthorhombic pseudosymmetry of Cs2Mo2O7 implies a possible high-temperature P21/cPbca transition. REFERENCES Zoya A. Solodovnikova, Sergey F. Solodovnikov, Rubidium Dimolybdate, Rb2Mo2O7, and Caesium Dimolydate, Cs2Mo2O7., Acta Crystallogr., Sect. C: Cryst. Struct. Commun. , 2006, 62, i53-i56. Links ÕâÖÖ¶«Î÷£¬Ëæ±ãÔÚgoogleÉÏÃæËÑһϣ¬µ½´¦¶¼ÊÇ¡£ [ Last edited by hawkchai on 2009-7-20 at 12:58 ] |
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