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Abstract  

Investigation of pure and calcium doped phase is the model investigation of phase which determine the blast turnace sinter reducibility. The object of examination are mono- and polycrystalline calciomagnetites of large grains dimension Fe3−xCaxO where 0.04≤x≤0.25. The solubility limit of calcium in magnetite was strictly defined and changes of some physico-chemical properties as well.

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Abstract  

Limestone and monocrystalline calcite tempers (grains) are abundant in ancient pottery. In pottery from the Canaan area the former is common in Iron Age storage and table-ware vessels and the latter is present in cooking pots. Limestone is much more widespread than monocrystalline calcite and the potters used it often as tempers when manufacturing pottery vessels, but usually not for cooking pots. While defects appear frequently around limestone tempers, they do not appear around monocrystalline calcite ones. This study examines the reason for using the latter tempers rather than the former ones. Raw materials of carbonate tempers in a clay matrix were fired and the decarbonation process was followed by quantitative IR thermospectrometry. The results indicate that the monocrystalline calcite tempers prevent formation of defects in the cooking pots during firing or during use. The reasons for this are higher thermostability at elevated temperatures, lower intensity of decarbonation, and retention of grain shape, as compared to limestone tempers.

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Abstract  

In an interlaboratory comparison four samples of monocrystalline silicon were analyzed sequentially by INAA in four laboratories. The results obtained demonstrate the possiblity of repeated use of silicion samples for interlaboratory comparisons. *** DIRECT SUPPORT *** A0653052 00003

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Journal of Thermal Analysis and Calorimetry
Authors: A. Fave, M. Bouchaour, A. Kaminski, S. Begrger, A. Ould-Abbas, and N. Chabane Sari

Abstract  

The fabrication of solar cells based on the transfer of a thin silicon film on a foreign substrate is an attractive way to realise cheap and efficient photovoltaic devices. The aim of this work is to realise a thin mono-crystalline silicon film on a double porous silicon layer in order to detach and transfer it on mullite. The first step is the fabrication of a double porous silicon layer by electrochemical anodisation using two different current densities. The low current leads to a low porosity layer and during annealing, the recrystallisation of this layer allows epitaxial growth. The second current leads to a high porosity which permits the transfer on to a low cost substrate. Liquid Phase Epitaxy (LPE) performed with indium (or In+Ga) in the temperature range of 950–1050C leads to almost homogeneous layers. Growth rate is about 0.35 μm min−1. Crystallinity of the grown epilayer is similar on porous silicon and on single crystal silicon. In this paper, we focus on the realisation of porous silicon sacrificial layer and subsequent LPE growth.

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Pollack Periodica
Authors: Ali Kareem Abdulrazzaq, György Bognár, and Balázs Plesz

mono-crystalline solar cell. Quantifying the error and evaluating the performance of the electrical sub-model is implemented by calculating the error at the maximum power point ( δ ), the coefficient of determination ( R 2 ), the Mean Absolute

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at high temperature, PS crystallized. SEM observation illustrated that porous silicon was transformed into quasi-monocrystalline porous silicon (QMPS) with the surface more or less pore free and few voids embedded inside the body. All these steps

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Journal of Thermal Analysis and Calorimetry
Authors: Veridiana Reyes-Zamudio, Carlos Angeles-Chávez, and Jorge Cervantes

a wide range of temperature, starting below 650 °C (assigned to the de-carbonation of polycrystalline calcite), to nearly 850 °C (attributed to the total decomposition of monocrystalline calcite). The Rocha sample showed a curve with wide

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. Moreover, some publications reported that the calcite in the pottery is decomposed at about 800–900 °C. This is true in DTA experiments in which monocrystalline calcite is treated under fast rate of heating. Nevertheless, in firing of calcareous raw

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Journal of Thermal Analysis and Calorimetry
Authors: Zs. Baji, Z. Lábadi, Z. E. Horváth, M. Fried, B. Szentpáli, and I. Bársony

. Wachinicki , L , Kravewski , T , Luka , G , Witkowski , B , Kowalski , B , Kopalko , K , Domagala , JZ , Guziewicz , M , Godlewski , M , Guziewicz , E . Monocrystalline zinc oxide films grown by atomic layer deposition . Thin Solid Films

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Journal of Thermal Analysis and Calorimetry
Authors: A. Derafa, M.-C. Record, D. Mangelinck, R. Halimi, and A. Bouabellou

metals were deposited onto monocrystalline silicon substrates orientated (100). To improve the homogeneity of the deposition, the substrate was rotating during deposition to improve the homogeneity of the layer. Both binary and ternary systems

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