Die Kristallstruktur von Denningit, (Mn,Ca,Zn) Te2O5. Ein Beispiel f�r die Koordination um vierwertiges Tellur

Walitzi, E. M.

doi:10.1007/bf01128633

Cited by 25 publications

(7 citation statements)

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“…3). This one-sided coordination is characteristic of Te 4+ with a stereoactive nonbonding lone pair of electrons (Andersson et al 1973, Brown 1974) and consequently is a common feature of several tellurite structures [walfordite (Back et al 1999), denningite (Walitzi 1965), mackayite (Pertlik & Gieren 1977), sonoraite (Donnay et al 1970), spiroffite (Cooper & Hawthorne 1996), and teineite (Effenberger 1977)]. …”

Section: Resultsmentioning

confidence: 99%

THE CRYSTAL STRUCTURE OF WINSTANLEYITE, TiTe3O8, FROM THE GRAND CENTRAL MINE, TOMBSTONE, ARIZONA

Bindi

Cipriani

2003

The Canadian Mineralogist

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We have refined the crystal structure of winstanleyite from the type locality, the Grand Central mine, Tombstone, Arizona, in space group I2 1 /a3 to a final R index of 2.03%. Unit-cell parameters of the crystal examined are: a 10.965(1) Å, V 1318.3(2) Å 3 , Z = 8. The structure previously reported for the synthetic analogue was confirmed, although a higher precision of refinement was achieved. The crystal-chemical environment of both Ti and Te cations is considered in relation with that in other tellurite structures.Keywords: winstanleyite, walfordite, crystal-structure refinement, Tombstone, Arizona. SOMMAIRENous avons affiné la structure cristalline de la winstanleyite provenant de la localité type, la mine Grand Central, à Tombstone, en Arizona, dans le groupe spatial I2 1 /a3 jusqu'à un résidu final R de 2.03%. Les paramètres réticulaire du cristal choisi sont: a 10.965(1) Å, V 1318.3(2) Å 3 , Z = 8. Nous confirmons la structure décrite antérieurement pour l'analogue synthétique, avec une précision améliorée. Nous évaluons l'environnement cristallochimique des cations Ti et Te en relation de celui d'autres structures de tellurites. (Traduit par la Rédaction)Mots-clés: winstanleyite, walfordite, affinement de la structure, Tombstone, Arizona. §

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Section: Resultsmentioning

confidence: 99%

THE CRYSTAL STRUCTURE OF WINSTANLEYITE, TiTe3O8, FROM THE GRAND CENTRAL MINE, TOMBSTONE, ARIZONA

Bindi

Cipriani

2003

The Canadian Mineralogist

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“…The insufficiently closed autoclave inadvertently led to high fluid losses in this specific experiment, so that an exceptionally high concentration of the potassium contents, which are otherwise preferred to fractionate into the remaining fluid phase, led to the crystallization of a K-containing oxidotellurate(IV) phase as a unique by-product. The crystalline reaction products of this run were identified as a mixture of a denningite-type (Walitzi 1965) solid solution of the composition Mn II (Mn II 0.18Cu II 0.82)(Te2O5)2, minor amounts of spiroffite, Mn II 2Te3O8 (Cooper & Hawthorne 1996) and rayite, Cu II Te2O5 (Hanke et al 1973), and subordinate amounts of the title compound K[(Cu II ,Mn II ,Mn III )2(TeO3)3]•2H2O, as identified by means of X-ray powder and single crystal diffraction. The subeuhedral K-(Cu,Mn)-zemannite crystals are characterized by an intensive dark brown colour and exhibit large hexagonal pillars up to 0.5 mm in length, morphologically dominated by the faces of the hexagonal prism.…”

Section: Experimental Synthesismentioning

confidence: 99%

K[(CuII,MnII,MnIII)2(TeO3)3]∙2H2O, the first zemannite-type structure based on a Jahn-Teller-distorted framework

Eder

Weil

Miletich

2022

Preprint

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Synthetic single crystals of K[(CuII,MnII,MnIII)2(TeO3)3]∙2H2O were obtained from an overconcentrated alkaline aqueous solution in the system K2O-MnO-CuO-TeO2 under hydrothermal conditions at T ≤ 220 °C. Subeuhedral single crystals have been investigated crystallographically by means of single-crystal X-ray diffraction. The crystal structure of this new zemannite-type representative follows a monoclinic twofold superstructure. The doubling of the unit-cell volume is accompanied by a hexagonal-to-monoclinic symmetry reduction, resulting in threefold twinning with individual crystal domains following the space group symmetry P21. Refinements of site-occupation factors and the evaluation of bond valences suggest a distribution of di- and trivalent cations on the octahedral M sites with a ratio (CuII+MnII) : MnIII approximating 1 : 1. From arguments about the cation sizes and the individual bond valence sums, a distribution of CuII1–xMnIIIx and MnIIx MnIII1–x at each two of the four M positions can be assumed with a presumed x between ~0.14 and ~0.50. The K+ cations and crystal water molecules inside the channels are located off the central channel axis. In contrast to most other known zemannite-type phases, the extra-framework atoms show full site occupations and are not disordered. The distribution of the channel contents supports the anisotropic deformation of the surrounding framework, which follows the local symmetry reduction as required for the Jahn-Teller distortion of the octahedrally coordinated M sites within the framework. The arrangement of the deformed channels can be understood as the origin of the existing superstructure.

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“…Tellurium(IV) oxides and oxotellurates(IV) are attracting more and more research attention, because they can adopt unusual crystal structures. Some examples are NdClTe 2 O 5 (tetragonal, P 4/ mmm ) [1] with ψ 1 ‐octahedrally coordinated Te 4+ cations, α‐TeO 2 (paratellurite: tetragonal, P 4 1 2 1 2) [2] and β‐TeO 2 (tellurite: orthorhombic, Pbca ) [3] and high‐pressure γ‐TeO 2 (orthorhombic, P 2 1 2 1 2 1 ) [4] with ψ 1 ‐trigonal bipyramidally coordinated Te 4+ cations, Zn[TeO 3 ] (orthorhombic, Pbca ) [5] with discrete ψ 1 ‐tetrahedral [TeO 3 ] 2− anions and Ca(Mn,Zn)[Te 2 O 5 ] 2 (as mineral denningite: tetragonal, P 4 2 / nbc ) [6] with pyroanionic [Te 2 O 5 ] 2− groups. This is mainly due to the variability in the coordination environments of the oxotellurate(IV) anion [7–9] and also the presence of a stereochemically active lone‐pair of electrons at their Te 4+ centers.…”

Section: Introductionmentioning

confidence: 99%

New Crystal Structures of Rare‐Earth Metal(III) Oxotellurates(IV) RE₂Te₃O₉: A1‐Type (RE=La, Ce) and A2‐Type (RE=Pr, Nd)

Chou

Höss

Russ

et al. 2021

Zeitschrift anorg allge chemie

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The new rare‐earth metal(III) oxotellurates(IV) RE2Te3O9 (RE=La−Nd) of the so far unknown A‐type structure can be obtained as needle‐shaped single crystals through solid‐state reactions of the corresponding binary oxides. Their crystal structures were determined as A1‐type for RE=La and Ce or A2‐type for RE=Pr and Nd by single‐crystal X‐ray diffraction. Both structure types crystallize in the monoclinic crystal system, but in two different non‐centrosymmetric space groups: the A1‐type with Z=8 in space group P21 (La2Te3O9: a=569.54(3), b=2230.12(13), c=1464.71(4) pm, β=101.205(3)°; Ce2Te3O9: a=567.02(3), b=2222.61(13), c=1457.13(9) pm, β=101.134(3)°) or the A2‐type with Z=16 in space group Cc (Pr2Te3O9: a=2838.61(16), b=563.89(3), c=2522.08(15) pm, β=118.816(3)°; Nd2Te3O9: a=2826.38(16), b=561.47(3), c=2511.94(15) pm, β=118.841(3)°). In spite of the differences in the unit‐cell parameters and the symmetry, both structures consist of quite similar fundamental building blocks (FBBs) consisting of eight crystallographically distinct rare‐earth metal‐oxygen polyhedra with C.N.(RE3+) from seven to nine and always twelve different ψ1‐tetrahedral oxotellurate(IV) anions [TeO3]2−, which show a high number of secondary bonding interactions (SBIs) with each other in all four cases.

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Die Kristallstruktur von Denningit, (Mn,Ca,Zn) Te2O5. Ein Beispiel f�r die Koordination um vierwertiges Tellur

Cited by 25 publications

References 7 publications

THE CRYSTAL STRUCTURE OF WINSTANLEYITE, TiTe3O8, FROM THE GRAND CENTRAL MINE, TOMBSTONE, ARIZONA

THE CRYSTAL STRUCTURE OF WINSTANLEYITE, TiTe3O8, FROM THE GRAND CENTRAL MINE, TOMBSTONE, ARIZONA

K[(CuII,MnII,MnIII)2(TeO3)3]∙2H2O, the first zemannite-type structure based on a Jahn-Teller-distorted framework

New Crystal Structures of Rare‐Earth Metal(III) Oxotellurates(IV) RE₂Te₃O₉: A1‐Type (RE=La, Ce) and A2‐Type (RE=Pr, Nd)

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Die Kristallstruktur von Denningit, (Mn,Ca,Zn) Te2O5. Ein Beispiel f�r die Koordination um vierwertiges Tellur

Cited by 25 publications

References 7 publications

THE CRYSTAL STRUCTURE OF WINSTANLEYITE, TiTe3O8, FROM THE GRAND CENTRAL MINE, TOMBSTONE, ARIZONA

THE CRYSTAL STRUCTURE OF WINSTANLEYITE, TiTe3O8, FROM THE GRAND CENTRAL MINE, TOMBSTONE, ARIZONA

K[(CuII,MnII,MnIII)2(TeO3)3]∙2H2O, the first zemannite-type structure based on a Jahn-Teller-distorted framework

New Crystal Structures of Rare‐Earth Metal(III) Oxotellurates(IV) RE2Te3O9: A1‐Type (RE=La, Ce) and A2‐Type (RE=Pr, Nd)

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New Crystal Structures of Rare‐Earth Metal(III) Oxotellurates(IV) RE₂Te₃O₉: A1‐Type (RE=La, Ce) and A2‐Type (RE=Pr, Nd)