The Crystal Structure of Tellurite (TeO<sub>2</sub>).

Ito, Tomoya; Sawada, Hideaki

doi:10.1524/zkri.1940.102.1.13

Cited by 11 publications

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“…22 The ionic arrangement of this lattice is identical with that of brookite and ideal axes computed from the ionic radii on the basis of equation (10) agree well enough with those of brookite (16,17) as it can be seen in Table 8. 22 The ionic arrangement of this lattice is identical with that of brookite and ideal axes computed from the ionic radii on the basis of equation (10) agree well enough with those of brookite (16,17) as it can be seen in Table 8.…”

Section: The Brookite Latticementioning

confidence: 56%

On the construction of the lattice of ionic crystals from the viewpoint of close packing II. AX2

Sasvári

1960

Acta Physica

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This paper deals with the construction of crystal lattiees of ionie compounds of composition AX 2 based on close packing. If the ratio of the ionic radii satisfies the inequality rA/rx ~ 0,732, then the construetion is very similar to that of CsCI and the lattice is built up from close-packed ionic planes which contain both the anions and cations, respectively, in the adequate ratio. In this case only one solution is possible, namely the CaF 2 lattice. Ir the ratio of the ionie radii satisfies the inequality 0,732 > rA/rx > 0,414 the solution can be found by investigating several possibilities of uniform eationie distributions in the octahedral cavities of the different spatial close-packed anionic frames which satisfy PAULING's coordination principle. Many such solutions can be found, several of them giving the lattice of rutile and its sister lattices with different chemical composition and cationic distribution, the lattiee of brookite and anatase. However, no actual crystal lattices have been found till now, corresponding to some of the possibilities.The actual erystal lattices ate almost always distorted and dilated eompared to the ideal ones built by close packing, but for the isotypie lattices forming a group the differenee volume associated with one anion has to be the same. With this supposition the author was able to show that a deviation from this rule oecurs in the crystal lattices of compounds ABaX s when the divalent A cations are Fe, Co, Ni of Mn. The most serious deviation can be found in the case of Fe. Another deviation can be found in the compounds AAs20 ~ which has to be attributed to the influenee of As +5 causing ah apparent decrease of the ionic radii of the divalent cations A.

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Section: The Brookite Latticementioning

confidence: 56%

On the construction of the lattice of ionic crystals from the viewpoint of close packing II. AX2

Sasvári

1960

Acta Physica

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“…All the polymorphs contain TeO 4 units with different structures and they differ in connectivity as shown in Figure 1a. [8][9][10] α-TeO 2 and γ-TeO 2 exist as a network of three-dimensionally connected corner-sharing TeO 4 units while a 2D layered network of edge-shared TeO 4 units is present in β-TeO 2 . The δ-phase seems to exist as a superposition of α-, β-, and γ-phases.…”

Section: Introductionmentioning

confidence: 99%

TeO₂: A Prospective High‐k Dielectric

Keerthana,

Venimadhav

2023

Physica Rapid Research Ltrs

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Herein, high‐k dielectric behavior of TeO2 thin films is investigated. The films are prepared using pulsed laser deposition on indium tin oxide (ITO)–glass substrates. Increasing the growth temperature has improved the surface roughness, transparency, and bandgap of the films. Films grown at 500 °C display nanocrystalline nature which is reflected in the increase of bandgap to 4.7 eV and is higher than the bulk value of α‐TeO2 (3.7 eV). The nanocrystalline TeO2 films in the metal–insulator–metal configuration show a stable high permittivity of ≈19 with low leakage current (J < 1 × 10−7 A cm−2) and good voltage stability (α = 509 ppm V−2). Field‐effect modulation is observed in the metal–oxide–semiconductor stack configuration with tellurium as a semiconductor. The study suggests nanocrystalline TeO2 as a low‐temperature processable high‐k material with high transparency for transistor applications.

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Ho₁₁ClTe₁₆O₄₈: Ein extrem chlorarmes Chlorid‐Oxotellurat(IV) des dreiwertigen Holmiums

Meier

Schleid

2006

Zeitschrift anorg allge chemie

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While attempting to synthesize Ho 2 Te 3 O 9 by reacting Ho 2 O 3 with TeO 2 (800°C, 12 d) chloride from the CsCl flux was incidently mobilized and as by-product, Ho 11 ClTe 16 O 48 (triclinic, P1; a ϭ 551.52(3), b ϭ 1193.54(6), c ϭ 1834.63(9) pm, α ϭ 100.814(3), β ϭ 95.443(3), γ ϭ 100.175(3)°; Z ϭ 1), the first example of this new composition in the field of lanthanoid(III) chloride oxotellurates(IV) has been obtained. The six crystallographically different Ho 3ϩ cations experience a six-, seven-and eightfold coordination through oxygen atoms (d(Ho 3ϩ ϪO 2Ϫ ) ϭ 221 Ϫ 280 pm), leading to octahedral, triangle-square polyhedral, capped trigonal prismatic and square antiprismatic coordination figures. Initially, the corresponding [HoO n ] polyhedra convene to layers parallel to the (001) plane via edge and corner sharing which again combine to a [Ho 11 O 48 ] 63Ϫ network via other individual [(Ho6)O 6 ] octahedra and [(Ho2) 2 O 4/2 O 4/1 ] chains along [100], whose three-dimensional characteristic is unique among the lanthanoid(III) oxotellurates(IV) known to date. The eight crystallographically independent Te 4ϩ cations exhibit coordination numbers of 3 and 3ϩ1 in relation to oxygen, except Te1 with 3ϩ1 O 2Ϫ plus 1 Cl Ϫ as anionic neighbours. Apart from isolated [TeO 3 ] 2Ϫ polyhedra (ψ 1 tetrahedra: Einleitung System Ho 2 O 3 ϪTeO 2 [1] konnten bislang lediglich TeO 2reiche Phasen in Form von Einkristallen erhalten, röntgenstrukturanalytisch untersucht und strukturell beschrieben werden. So kristallisiert Ho 2 Te 4 O 11 (ϵ Ho 2 O 3 · 4 TeO 2 ) [2] isostrukturell mit den übrigen Lanthanoid(III)-Oxotelluraten(IV) der Zusammensetzung M 2 Te 4 O 11 (M ϭ La Ϫ Nd, Sm Ϫ Lu) [3Ϫ6] im monoklinen Nd 2 Te 4 O 11 -Typ [7] (Raumgruppe: C2/c). Die Ho 3ϩ -Kationen liegen in achtfa-1759 d(Te 4ϩ ϪO 2Ϫ ) ϭ 184 Ϫ 196 pm) only double and triple groupings occur even in considering secondary Te 4ϩ ···O 2Ϫ contacts (dЈ(Te 4ϩ ···O 2Ϫ ) ϭ 218 Ϫ 264 pm). As with HoCl[TeO 3 ], the tellurium-oxygen partial structure does not get beyond a "zerodimensional" expression. The Te 4ϩ cations adjust so well while lining the empty cavities within the 3 ϱ [Ho 11 O 48 ] 63Ϫ network, that still only two Te 4ϩ -decorated channel types (oval and round) remain unoccupied, offering space for the non-bonding electron pairs ("lone pairs"). The Cl Ϫ anions reside in the bigger oval channels (d(Cl Ϫ ϪTe 4ϩ ) ϭ 286, 352 and 358 pm, 2 ϫ each). In the default of binding Ho 3ϩ ϪCl Ϫ contacts, the correct description of this new compound would thus be holmium(III) oxochlorotellurate(IV) Ho 11 [Te 16 O 48 Cl] according to Ho 11 [TeO 3 ] 2 [Te 2 O 6 ] 2 [Te 3 O 9 ] 2 {Cl[Te 2 O 6 ] 2 }. The presence of chloride was not only detected by the structure refinement on the basis of X-ray diffraction data, but also even in such small quantities by elementary analysis with the electron-beam microprobe.

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The Crystal Structure of Tellurite (TeO₂).

Cited by 11 publications

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On the construction of the lattice of ionic crystals from the viewpoint of close packing II. AX2

On the construction of the lattice of ionic crystals from the viewpoint of close packing II. AX2

TeO₂: A Prospective High‐k Dielectric

Ho₁₁ClTe₁₆O₄₈: Ein extrem chlorarmes Chlorid‐Oxotellurat(IV) des dreiwertigen Holmiums

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The Crystal Structure of Tellurite (TeO2).

Cited by 11 publications

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On the construction of the lattice of ionic crystals from the viewpoint of close packing II. AX2

On the construction of the lattice of ionic crystals from the viewpoint of close packing II. AX2

TeO2: A Prospective High‐k Dielectric

Ho11ClTe16O48: Ein extrem chlorarmes Chlorid‐Oxotellurat(IV) des dreiwertigen Holmiums

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The Crystal Structure of Tellurite (TeO₂).

TeO₂: A Prospective High‐k Dielectric

Ho₁₁ClTe₁₆O₄₈: Ein extrem chlorarmes Chlorid‐Oxotellurat(IV) des dreiwertigen Holmiums