Pyrochlore | Structure, Properties, Uses | Britannica
pyrochlore, a complex oxide mineral [ (Na, Ca) 2 Nb 2 O 6 (OH,F)] composed of niobium, sodium, and calcium that forms brown to black, glassy octahedral crystals and irregular masses.
Pyrochlore Mineral Data
Pyrochlore. Comments: Deep brownish black crystals of pyrochlore to 0.9 cm across. Location: Lauzon Farm, Oka, Quebec, Canada. Scale: 3.9 x 2.9 cm. © John Veevaert
Pyrochlore Supergroup: Mineral information, data and localities.
The pyrochlore supergroup is a group of chemically complex cubic oxides. The classification of the pyrochlore supergroup is based on the ions at the A, B and Y sites. A correct identification of individual members is only possible using a combination of several analytical methods.
Cava Lab: Pyrochlore - Princeton University
Ca 2 Nb 2 O 6 F (download cif) is the nominal pyrochlore mineral. The general formula for Pyrochlore is A 2 B 2 O 7, or more accurately: A 2 B 2 O 6 O'. In the case of nominal pyrochlore, F occupies the F' site. Pyrochlore is highly symmetric, and is face-centered.
A new model for the origin of pyrochlore: Evidence from the St …
2023年8月20日 · In these and most other carbonatite-hosted niobium deposits, pyrochlore is the principal ore mineral. Four major pyrochlore-bearing rock types are observed in the St Honoré complex, namely, biotitite, magnetite-biotite rock, apatitite and carbonatite.
Pyrochlore - an overview | ScienceDirect Topics
Pyrochlore is defined as an anion-deficient derivative of the fluorite structure type, characterized by a doubled cell parameter 'a' and a change in space group. It consists of cations in eightfold and sixfold coordination, with anions located in corner-sharing octahedra forming tunnels within …
Optical Properties: Translucent to opaque. Color: Black to brown, chocolate-brown, reddish brown, amber-orange, red-orange. Streak: Brown. Luster: Vitreous to resinous. Optical Class: Isotropic, weak anomalous anisotropism. n = 1.9–2.2. Fd3m. X-ray Powder Pattern: Blue River, British Columbia, Canada.
Pyrochlore: Mineral information, data and localities. - mindat.org
Pyrochlore: Mineral information, data and localities. The name pyrochlore which was first introduced by J.J. Berzelius for a cubic mineral found by N.O. Tank in the 1820s in a syenite pegmatite at Stavern (formerly Fredriksvärn), Norway (Wöhler 1826).
Pyrochlore Oxides: Structure, Properties, and Potential in ...
Unveils the potential of pyrochlore-based compounds as promising options for photocatalysis; Discusses the use of complex metal oxides used in biomedical materials and regenerative medicine
Universal geometric frustration in pyrochlores - Nature
2018年7月5日 · Here we report the observation of structural instability present in the pyrochlores A2 Zr 2 O 6 Oʹ (A = Pr, La) and Yb 2 Ti 2 O 6 Oʹ, that exists despite ideal stoichiometry, ideal...
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