Ultrafine barium titanate particles in the Allende meteorite
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چکیده
منابع مشابه
Barium and Neodymium Isotopic Anomalies in the Allende Meteorite
Isotopic anomalies have been found for Ba and Nd in two inclusions from the Allende meteorite. These inclusions are typical Ca-Al-rich objects associated with early condensates from the solar nebula but have distinctive O and Mg isotopic anomalies of the FUN type. Sample Cl shows a depletion only in Ba of 2 parts in 10 and normal Nd. Sample EK1-4-1 shows large positive excesses in the unshielde...
متن کاملCalcium Isotopic Anomalies in the Allende Meteorite
We report isotopic anomalies inCa which were found in two Ca-Al-rich inclusions of the Allende meteorite. These inclusions previously had been shown to contain special anomalies for Mg and 0 which were attributed to fractionation and unknown nuclear effects. The Ca data when corrected for mass fractionation by using 4°Ca; 44Ca as a standard show nonlinear isotopic ~ffects in 48Ca of + 13.5 per ...
متن کاملStrontium Isotopic Anomalies in the Allende Meteorite
We report Sr isotope anomalies in two Ca·Al-rich inclusions (EKl-4-1 and Cl) of the Allende meteoritewhichalsocontainanomaliesin 0, Mg, Ca, Ba, Nd and Sm. The Sr effects correspond to 84 Sr or 88 Sr deficits of 3.2"too and 0.8%o or to 86 Sr excesses of 1.6%o and 0.4"too. Although it cannot be ascertained in which isotope the anomalies reside, arguments based on the 8 7 Sr abundance indicate tha...
متن کاملFullerene-like carbon nanostructures in the Allende meteorite
Transmission electron microscopy has been used to examine carbon isolated from the Allende meteorite. The structure of the carbon is rather disordered, consisting of curved and faceted graphene sheets with little large scale graphitization, and resembles that of a microporous carbon following high temperature heat treatment. Closed carbon nanoparticles, typically V2^10 nm in diameter are common...
متن کاملExperimental determination of scattering matrices of olivine and Allende meteorite particles
We have measured the scattering matrix as a function of the scattering angle of randomly oriented particles of a Mg-rich olivine sample and a ground piece of Allende meteorite as cometary analogues using lasers at two wavelengths (442 nm and 633 nm). The elements of the scattering matrix, Fij , depend on the scattering angle, the wavelength of the laser light, and on the size, shape and refract...
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ژورنال
عنوان ژورنال: GEOCHEMICAL JOURNAL
سال: 1977
ISSN: 0016-7002
DOI: 10.2343/geochemj.11.137