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Heterogeneous metamictization of zircon on a microscale
Geochimica Et Cosmochimica Acta, 1996The ability of modern Raman microprobes to determine the crystallinity of zircon with a lateral resolution of about 1 μm and a volume resolution of less than 5 μm3 opens up new opportunities for correlating structural, chemical, and isotopic data on the same micro-area within a zircon grain.
Lutz Nasdala, Robert T Pidgeon
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MRS Bulletin, 1987
Recently, the words “metamict” or “metamictization” have been increasingly used instead of “amorphous” or “amorphization” in acknowledgment of the fact that the first recognized example of the transition from the crystalline to the aperiodic state was in natural materials—minerals. The term (originally “metamikte” from Greek for “mix otherwise” because
R.C. Ewing +3 more
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Recently, the words “metamict” or “metamictization” have been increasingly used instead of “amorphous” or “amorphization” in acknowledgment of the fact that the first recognized example of the transition from the crystalline to the aperiodic state was in natural materials—minerals. The term (originally “metamikte” from Greek for “mix otherwise” because
R.C. Ewing +3 more
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Proceedings, annual meeting, Electron Microscopy Society of America, 1982
The phenomenon of radiation damage in minerals is of interest because of its bearing on both radioactive waste disposal and the determination of geological age. It is important to understand the defects produced in minerals at the different stages of structural damage by radiation.
Ignatius Y. Chan, Peter R. Buseck
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The phenomenon of radiation damage in minerals is of interest because of its bearing on both radioactive waste disposal and the determination of geological age. It is important to understand the defects produced in minerals at the different stages of structural damage by radiation.
Ignatius Y. Chan, Peter R. Buseck
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Metamict Transformation of Silica
MRS Proceedings, 2003AbstractAlpha quartz can be transformed to a metamict phase in a physical reaction such as irradiation with fast ions, neutrons and electrons. As truly inspired by this fact, we design a simple experiment to produce disordered silica and at the same time watch the transformation using a transmission electron microscope.
Ju-Yin Cheng +2 more
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Modeling the metamictization of ion bombarded ceramics
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1998Abstract The Segregation Charge Transfer (SCT) model, applied with success to many binary alloys, is extended and adapted to interpret the nucleation either of crystalline or amorphous phases in binary ceramics undergoing ion bombardment under conditions that form dense collision cascades.
OSSI, PAOLO MARIA, R. Pastorelli
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Recrystallization of metamict allanite
Mineralogical Magazine, 2011AbstractAllanite is a common accessory mineral in igneous rocks. Allanite becomes metamict over geological time-scales as a result of the α-decay of radioactive elements in the crystal structure. This study focuses on the recrystallization of metamict allanite from Savvushka, Russia.
Beirau, T., Paulmann, C., Bismayer, U.
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THE HYDROTHERMAL RECRYSTALLIZATION OF METAMICT ALLANITE-(Ce)
The Canadian Mineralogist, 2010Samples of metamict allanite-(Ce) originating from granite pegmatites were recrystallized by heating in air and under hydrothermal conditions. Recrystallization in air resulted in partial recovery of the crystal structure at 650°C. Heating at higher temperatures resulted in decomposition of the allanite structure to a multiphase assemblage containing ...
Čobić, Andrea +3 more
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Study of metamict Ceylon zircons
Mineralogical Magazine, 1972SummaryX-ray, density, refractive index, and optical absorption measurements have been made on metamict Ceylon zircons. The appearance of a previously reported anomalous optical absorption spectrum in low Ceylon zircons has been associated with small particles of cubic or tetragonal zirconium dioxide in a radiation-damaged zircon lattice, in both ...
E. R. Vance, B. W. Anderson
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Spherulitic Recrystallization of Metamict Polycrase
Science, 1974Spherulites occur in the metamict matrix of the rare earth AB 2 O 6- type niobium-tantalum-titanium oxide, polycrase. Microprobe analyses show that the spherulites are similar in composition to the metamict polycrase except for a fivefold increase in calcium oxide.
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The metamict transformation in alpha-quartz
Radiation Effects, 1983Abstract The crystalline→noncrystalline (metamict) transformation in α-quartz under electron irradiation has been studied by transmission electron microscopy (TEM), ultra-high resolution structure imaging (SI) and convergent beam electron diffraction (CBD).
M. R. Pascucci +2 more
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