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Browsing ELibrary by Title
Now showing items 6700-6719 of 21879
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(2004)The behaviour of the ammonium ion in synthetic buddingtonite, N(D,H)4AlSi3O8, has been studied by infrared (IR) spectroscopy from 20K to 298K and by 2H NMR spectroscopy from 120K to 298K. IR spectra were collected from 500 ...
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(2001)It has been realized previously (e.g. Borradaile 1994) that cycling through the Morin transition (Tm, occurring in ideal a-Fe2O3 at -10 °C) may have implications for the NRM of some haematite-bearing rocks. We investigate ...
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(2002)The crystal structure of stibnite [Sb2S3, Pnma, a=11.314(2), b=3.837(2), c=11.234(3) A, V= 487.7(3) A3 at 293 K] was refined in situ at 230, 173, and 128 K. It is a major characteristic of the structure that the Sb-S ...
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(2003)This paper reports low-temperature cycling (LTC) through the Verwey transition of anhysteretic remanence (ARM), partial ARMs and partially demagnetised saturation isothermal remanence (SIRM) induced at room temperature in ...
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(2004)It may be difficult to isolate stable palaeomagnetic vectors of different ages if they lie in grain assemblages with overlapping ranges of coercivity or of unblocking temperature. This is because some moments associated ...
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(1999)Early Cambrian sediments on the East European platform in North Estonia, represented mostly by clays and silty clays, were deposited under normal marine conditions. The sediments were never affected by significant tectonic ...
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(2001)The heat capacity of synthetic pentlandite Fe4.60Ni4.54S8 was measured over the temperature range 6-306 K. Experimental values of Cp (T) indicate that there are no phase transitions. The thermodynamic functions Cp (T), ...
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(2001)The temperature dependence of strontianite SrCO3(c) heat capacity was determined within the range 0-336 K. It was measured within 22.13-336.94 K and calculated below 22.13 K. The experimental data were approximated with ...
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(2001)The heat capacity of witherite BaCO3 (c) as a function of temperature was experimentally studied in the interval 20.03-338.81 K and was calculated for temperatures below 20.03 K. At 298.15 K, the standard heat capacity, ...
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(1998)Titanium substitution has a significant effect on the temperature dependence (5-300 K) of low-temperature saturation remanence and of initial susceptibility in synthetic and natural titanomagnetite (Fe3-xTixO4, 0=<x<0.7). ...
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(2002)Hysteresis loops have been measured as a function of temperature between 10 K and room temperature for two samples of pseudo-single-domain magnetite. One sample, with mean grain size of 2-3 μm, displays just surface ...
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LOW-TEMPERATURE MAGNETIZATION AND AC SUSCEPTIBILITY OF MAGNETITE: EFFECT OF THERMOMAGNETIC HISTORY (2003)Saturation isothermal remanent magnetization (SIRM) and AC susceptibility have been measured as a function of temperature between 5 K and room temperature for one multidomain and three pseudo-single-domain magnetite samples ...
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(2003)The Middle Paleozoic Maksyutov Complex is an important component of the Eurasian collisional orogeny. It consists of dominant mica-rich garnet schist and mica-poor quartzofeldspathic gneiss enclosing minor mafic eclogite ...
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(2001)Manganese oxide-hydroxide compounds were synthesized under low temperature conditions (3-22°C). They are represented by X-ray amorphous and crystalline compounds. The latter consist of minerals with layered crystal structures ...
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(1997)The microstructure of the outer taenite rim and cloudy zone of meteoritic metal was investigated using high resolution scanning electron microscopy and analytical electron microscopy. The microstructure is formed by a ...
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LOW-TEMPERATURE PROPERTIES OF A SINGLE CRYSTAL OF MAGNETITE ORIENTED ALONG PRINCIPAL MAGNETIC AXES (1999)We have measured saturation induced and remanent magnetizations and induced magnetization as a function of field at low temperatures, between 300 K and 10 K, on an oriented 1.5-mm single crystal of magnetite. The induced ...
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(2002)Two-dimensional modulation in synthetic akermanite (Ca2MgSi2O7) and hardystonite (Ca2ZnSi2O7) has been studied by the single-crystal X-ray diffraction methods in the temperature range between 18 and 297 K. It is found that ...
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(2003)As is usual for peculiar chemical compositions, melilite-type compounds exhibit a two-dimensional incommensurately modulated structure which can be described with two wave vectors: q1=α(a* + b*) and q2=α(-a* + b*), where ...
Now showing items 6700-6719 of 21879