Thermodynamic properties of tellurite (β-TeO2), paratellurite (α …
Nov 1, 2022 · Tellurium (IV) oxide, TeO 2, is polymorphic and known from nature as the minerals tellurite (β-TeO 2, space group Pbca) and paratellurite (α-TeO 2, space group P 4 1 21). A synthetic γ-TeO 2 polymorph can be obtained by devitrification of TeO2 glass (Blanchandin et al., 1999; Li et al., 2010; Weil, 2017).
Tellurium dioxide - Wikipedia
Tellurium dioxide (TeO 2) is a solid oxide of tellurium. It is encountered in two different forms, the yellow orthorhombic mineral tellurite, β-TeO 2, and the synthetic, colourless tetragonal (paratellurite), α-TeO 2. [2] . Most of the information regarding reaction chemistry has been obtained in studies involving paratellurite, α-TeO 2. [3]
Paratellurite: Mineral information, data and localities. - mindat.org
Named from the Greek 'para' for near, and tellurite, for the polymorphic relationship to that mineral. This page provides mineralogical data about Paratellurite. Switzer, G., Swanson, H.E. (1960) News and notes: paratellurite, a new mineral …
Paratellurite TeO2 c 2001-2005 Mineral Data Publishing, version 1 Crystal Data: Tetragonal. Point Group: 422. Rarely in prismatic crystals, to 3 mm; commonly fine-grained massive. Physical Properties: Hardness = 1 D(meas.) = 5.60 D(calc.) = 6.017 Optical Properties: Semitransparent. Color: Grayish white. Luster: Resinous to waxy.
Electronic structure and optical properties of TeO2 polymorphs
Jun 1, 2019 · The lattice parameters (a and c), bulk modulus (B) and its pressure derivative (B′) are all calculated for three polymorphs of TeO 2: paratellurite (α-TeO 2), tellurite (β-TeO 2) and a recently synthesized phase (γ-TeO 2). These properties at equilibrium phase agree well with the available theoretical and experimental values.
Optical Properties of Single-Crystal Paratellurite (Te O 2 )
Nov 15, 1971 · Absorption at the fundamental band edge, the dispersion characteristics of the refractive indices, the optical rotatory power, associated temperature coefficients, and the photoelastic constants have been investigated. Absorption at the band edge has been found to obey the exponential Urbach rule up to 5 × .
In this paper we report the results of studying the hightemperature plastic deformation of covalent paratellurite (TeO 2) single crystals, which have a rutile lattice and exhibit a weakly pronounced cleavage along {100} planes [12]. Paratellurite is characterized by a very high anisotropy of elastic properties [12–14].
Electronic and optical properties of paratellurite TeO2 under …
Jun 1, 2017 · In this communication, the electronic and optical properties of paratellurite TeO 2 (α-TeO 2) single crystal under pressure up to 9 GPa are investigated by means of the first principles calculations in the framework of the density functional theory.
Optical Properties of Single-Crystal Paratellurite (TeO_ {2})
Nov 15, 1971 · Absorption at the fundamental band edge, the dispersion characteristics of the refractive indices, the optical rotatory power, associated temperature coefficients, and the photoelastic constants...
Paratellurite - PubChem
Paratellurite is a mineral with formula of Te 4+ O 2 or TeO 2. The corresponding IMA (International Mineralogical Association) number is IMA1962 s.p.. The IMA symbol is Ptlr.
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