Die Kristallstruktur eines unbenannten zeolithartigen Telluritminerals, {(Zn, Fe)2[TeO3]3}NaxH2?x�yH2O

New BaM2(SeO3)3·nH2O (M = Co, Ni, Mn, Mg; n ≈ 3) Zemannite‐Type Frameworks: Single‐Crystal Structures of BaCo2(SeO3)3·3H2O, BaMn2(SeO3)3·3H2O and BaMg2(SeO3)3·3H2O

“…For each phase, a hemisphere of intensity data was collected with the aid of the SMART and SAINT software packages. [19] Empirical (multi-scan) absorption corrections were applied by using SADABS [20] with resulting correction-factor ranges of 0.081-0.631 for BaCo 2 were located by direct methods [21] in space group P6 3 (No. 173), and the remaining O atoms were located from difference maps as the full-matrix least-squares refinement against |F| 2 progressed.…”

“…Initially, there was some uncertainty over its chemical composition, and it was formulated as Na x H y ZnFe(TeO 3 ) 3 · nH 2 O. [2] A careful study by Miletech [3] indicated that magnesium, not sodium, is the extra-framework cation and that all of the framework iron atoms are trivalent, negating the requirement for extra-framework protons. Thus, zemannite, and the isostructural mineral kinichilite [4] (containing manganese in place of zinc), have ideal formulae of Mg 0.5 ZnFe-(TeO 3 ) 3 ·4.5H 2 O and Mg 0.5 MnFe(TeO 3 ) 3 ·4.5H 2 O, respectively.…”

Synthesis and Characterization of NaGaTe2O6·2.4H2O: A New Open-Framework Tellurite Related to Zemannite

“…A related research area concerns synthesizing new non-aluminosilicate zeolitic materials. Beginning with the aluminum phosphates, i.e., AlPO's, this chemistry has been extended to encompass a variety of transition and main group elements. − Despite these efforts, open-framework tellurites are extremely rare; in fact, only one naturally occurring open-framework tellurite mineral, zemannite Mg 0.5 [(Zn,Fe) 2 (TeO 3 ) 3 ]·4.5H 2 O, has been found. , To the best of our knowledge, only one instance of synthetic zemannite has been reported . In this communication we report the synthesis and structure of NaGaTe 2 O 6 ·2.4H 2 O, an open-framework tellurite with a zemannite-like structure. − …”

The crystal chemistry of the tellurium oxide and tellurium oxosalt minerals

“…Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 7/11/15 2:53 PM such minerals were determined by a working group of this author within the last six years (teineite: ZEMANN and ZEMANN, 1962; denningite: WALITZI, 1965;tellurite: BEYER, SAHL andZEMANN, 1965-refinement by BEYER, 1967; Zn analogue to spiroffite: HANKE, 1966; unnamed hexagonal Te mineral: MATZAT, 1967). It is perhaps worth-while to review now the results, as the general features of the crystal chemistry of tellurium in this group of minerals seem to have turned up rather clearly.…”

“…Isolated TeOe pyramids have been found in teineite (ZEMANN und ZEMANN, 1962) and in the unnamed hexagonal Te mineral (MATZAT, 1967); they occur also in the synthetic compound ZnTeOe (HANKE, 1967). On the contrary, isolated Te04 groups have so far not been found in any crystal structure, but they are well known in polymerized 1 The oxidation state of tellurium in oxosalt structures can be deduced from its coordination.…”