Tetragermanates of strontium, lead, and barium of formula type AB4O9 | Zendy

Carl R. Robbins | Zendy; Eenest M. Levin | Zendy

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Tetragermanates of strontium, lead, and barium of formula type AB4O9

Author(s) -

Carl R. Robbins,

Eenest M. Levin

Publication year - 1961

Publication title -

journal of research of the national bureau of standards section a physics and chemistry

Language(s) - English

Resource type - Journals

eISSN - 2376-5704

pISSN - 0022-4332

DOI - 10.6028/jres.065a.016

Subject(s) - isostructural , barium , strontium , metastability , melting point , crystallography , congruent melting , germanium , materials science , silicate , atmospheric temperature range , diffraction , chemistry , mineralogy , crystal structure , silicon , physics , phase (matter) , thermodynamics , metallurgy , phase diagram , optics , organic chemistry , composite material

Three new tetragermanates, SrGe 4 O 9 , PbGe 4 O 9 , and BaGe 4 O 9 , of formula type AB 4 O 9 were found. BaTiGe 3 O 9 , the germanium analog of the mineral silicate benitoite (BaTiSi 3 O 9 ) was prepared for study and comparison. Indexed X-ray powder diffraction patterns of the tetragermanates and of BaTiGe 3 O 9 and BaTiSi 3 O 9 show: (1) the tetragermanates are apparently isostructural; (2) the unit cell of BaTiGe 3 O 9 at room temperature is related to that of the tetragermanates by a doubling of the c -axis of the latter; (3) the tetragermanates and the metastable (room temperature) form of BaTiGe 3 O 9 are apparently structurally similar to, but not isostructural with benitoite; (4) within its temperature stability range, BaTiGe 3 O 9 appears to be isostructural with BaTiSi 3 O 9 . Density, melting point, and partial optical data for the tetragermanates were obtained.

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