pyrochlore


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Related to pyrochlore: columbite

pyrochlore

[′pī·rə‚klȯr]
(mineralogy)
(Na,Ca)2(Nb,Ta)2O6(OH,F) Pale-yellow, reddish, brown, or black mineral, crystallizing in the isometric system, and occurring in pegmatites derived from alkalic igneous rocks. Also known as pyrrhite.
References in periodicals archive ?
Both of these complexes contain pyrochlore and their SrO content of carbonate minerals ranges from 0.74-3.94 wt.% and 0.12-1.55 wt.% in Leo-Shilman and Sellai Pattai, respectively, consistent with igneous origin for the carbonates of the carbonatites.
The problem of the synthesis consists in avoiding the formation of the undesired pyrochlore phases--[Pb.sub.1.45][Nb.sub.2][O.sub.6.26] or Ti([Ni.sub.1/3][Nb.sub.2/3])[O.sub.4] [19].
Through an increase in the compositions [Pr.sub.6][O.sub.11] concentration, a decrease in the cassiterite phase (Sn[O.sub.2]) and an increase in the [Pr.sub.2][Sn.sub.2][O.sub.7] pyrochlore phase occurred.
Srivastava, "On the luminescence of [Bi.sup.3+] in the pyrochlore [Y.sub.2][Sn.sub.2][O.sub.7]," Materials Research Bulletin, vol.
In order to decrease volatilization of Pb and eliminate the formation of the pyrochlore phase in PZT thin films, the annealing treatment was implemented in the air with a rapid thermal process at 500[degrees]C, 600[degrees]C, and 700[degrees]C.
Bismuth oxide based pyrochlore materials are of interest for decoupling capacitors, wireless communications, and low-fired high-frequency filter applications due to their dielectric properties.
Attributes/comments: Niobium Tin Pyrochlore (NTP) Yellow is a new class of Complex Inorganic Colored Pigment (CICP) under Pigment Yellow 227 that breaks that compromise with excellent durability, high opacity and bright clean yellow color.
No undesirable peak of pyrochlore phase appears in the XRD patterns of PZT films annealed at 700[degrees]C, which implies that PZT films are well crystallized with perovskite structure with preferred orientation of (111) peak at 2[theta] = 38.20.
An example is the formation of a PT phase with the pyrochlore structure observed during a coprecipitation synthesis experiment [12].
Moon, "NO decomposition over the electrochemical cell of lanthanum stannate pyrochlore and YSZ composite electrode," Solid State Ionics, vol.
The energy spectra for a large number of NORM samples were measured, including: slate, cat litter, ice melt, roofing tiles, hay, coal, fertilizer, Australian zircon sand, diammonium phosphate (DAP), ISG Pye, CEMEX type FC, monocalcium phosphate (biofos), allanite, monazite, pyrochlore and zircon.