Temat: PXRD diffraction - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Synthesis of citrates of selected lanthanides (Er, Ho and Lu)
Autorzy:: Janusz, Władysław
Pikus, Stanisław
Skwarek, Ewa
Olszewska, Elżbieta
Powiązania:: https://bibliotekanauki.pl/articles/1450220.pdf
Data publikacji:: 2020
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:: PXRD diffraction
Powder X-Ray Diffraction
FTIR
Fourier Transform Infrared
Er
Erbium
Ho
Holmium
Lu
Lutetium
citrates of Er
citrates of Ho
citrates of Lu
Opis:: Holmium, erbium and lutetium citrates can be synthesized by transforming freshly precipitated holmium, erbium and lutetium hydroxides in the citric acid solution under the hydrothermal conditions (above 100 ℃) after 3 days of reaction. In this paper in order to determine the synthesis conditions, the hydroxide and citrate stability areas of selected lanthanides were compared. The studies of the structure of the obtained holmium citrate, erbium and lutetium samples showed that these compounds crystallize in a monoclinic system. The crystallite sizes determined by the HalderWagner method were 67.8 ± 8.0nm, 103.7 ± 4.5nm and 68.1 ± 4.2nm, respectively for the holmium citrate, erbium citrate and lutetium citrate samples. The shifts of the hydroxyl and carboxyl groups of citric acid in the FTIR spectrum indicate the interactions of both groups with holmium, erbium and lutetium cations. Then the obtained samples were subjected to the analysis of composition, and their particle size distribution was determined.
Źródło:: Physicochemical Problems of Mineral Processing; 2020, 56, 6; 225-234
1643-1049
2084-4735
Pojawia się w:: Physicochemical Problems of Mineral Processing
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Iron-bearing phases affecting the colour of upper Neogene clayey sediments from Dymaczewo Stare, west-central Poland
Autorzy:: Klęsk, Jakub
Błachowski, Artur
Diduszko, Ryszard
Kruszewski, Łukasz
Widera, Marek
Powiązania:: https://bibliotekanauki.pl/articles/2204349.pdf
Data publikacji:: 2022
Wydawca:: Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:: mineral composition
powder X-ray diffraction
PXRD
iron minerals
57Fe Mössbauer spectroscopy
57Fe- MS
Poznań clays
Mio-Pliocene
skład mineralny
proszkowa dyfrakcja rentgenowska
minerały żelaza
spektroskopia Mössbauera
iły poznańskie
Opis:: The present paper investigates the colour dependence of mineral compositions in clay-rich sedimentary strata, mainly clayey silts, the emphasis being on iron-bearing minerals (rather than clay minerals) by using powder X-ray diffraction (PXRD) and 57Fe Mössbauer spectroscopy (57Fe-MS). The PXRD-based phase analysis has demonstrated the variable compositions of samples, consisting of, inter alia, quartz, calcite or gypsum, and admixtures of potassium feldspars and plagioclase. Hematite + goethite (sample D1, dark red), goethite (sample D2, pinkish brown), poorly crystalline goethite (sample D3, orange) and jarosite (sample D4, yellow) have been distinguished. A very low jarosite content was detected in sample D5 (light grey); this did not affect its colour. The potential yellow/brown shades in sample D6 (dark grey), coming from trace amounts of jarosite, are masked by macroscopically visible organic matter. In the case of the two last-named samples (D5 and D6), with trace amounts of Fe-bearing minerals, it is most likely that the organic matter was effective in influencing the light and dark grey colour of the sediment, respectively.
Źródło:: Geologos; 2022, 28, 2; 129--139
1426-8981
2080-6574
Pojawia się w:: Geologos
Dostawca treści:: Biblioteka Nauki

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