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Halloysites/polypropylene nanocomposites with different nanotubes contents were prepared by diluting a masterbatch containing 30 wt.% halloysites with polypropylene (PP). Unmodified (HNTs) and quatern...
The Late Cretaceous Silistar intrusion comprises of gabbros, gabbro-diorites to quartz-diorites and aplites, that were emplaced into a volcano-sedimentary succession of similar age. Structural data su...
Abstract: Alumina-pillared montmorillonite is prepared by intercalation of polyoxyhydroxy aluminum cations (Al137+) of a natural montmorillonite from Dimitrovgrad, Bulgaria. Transmission electron micr...
Abstract: The structural transformation of dioctahedral 2:1 layer silicates (illite, montmorillonite, glauconite, and celadonite) during a dehydoxylation-rehydroxylation process has been studied by X-...
Abstract: The incorporation of transition metals into hematite may limit the aqueous concentration and bioavailabity of several important nutrients and toxic heavy metals. Before predicting how hemati...
To verify the oxidation-dehydrogenation reaction induced by heat treatment of ilvaite in air, acrystal from Elba Island, Italy, was selected for annealing experiments and crystal chemical study. X-ray...
The coordination environment of 20-200 ppm Pt in yellowish glasses from the CaO-Al O -SiO 2 3 2(CAS) ternary was studied using X-ray absorption fine structure spectroscopy at the Pt-L edge. IIIedge...
Abstract: Structural Fe3+ in kaolinites and dickites covering a broad range of disorder was investigated using electron paramagnetic resonance (EPR) spectroscopy at both the X and Q-band frequencies. ...
X-ray absorption measurements on Kr dissolved homogeneously in vitreous silica (1.97 wt% Kr) have been carried out at the Kr K-edge at 4.5 K, representing the first direct determination of the sites ...
Polarized IR-absorption spectra were measured on inclusion-free spots, 50 ?m in diameter of (100)-, (010)-, and (001)-oriented single-crystal plates of orthorhombic cordierites extracted from anatec...
Abstract: Synthetic hematites prepared in the presence of phosphate can incorporate phosphorus (P) in forms other than phosphate adsorbed by ligand-exchange on the crystal surface. To investigate the ...
Abstract: Vermiculite crystals from Santa Olalla, Spain, were first Na exchanged and then intercalated with monomethylammonium (= NH3(CH3)+, MMA) and dimethylammonium (= NH2(CH3)2+, DMA) molecules, re...
Abstract: Vermiculite from Santa Olalla, Spain, was intercalated with tetramethylphosphonium [P(CH3)4+ = TMP], using a TMP-bromide solution at 70∑C for three weeks. The resulting TMP-exchanged vermicu...
Single-crystalX-raydiffractionwasperformedinsituat T 20,230,465,and700C Si O , I2/c,a 8.402, b 13.043, c 14.308 onapartiallyorderedleadfeldspar(PbAl2 2 8351?? A, 115.30, V 1417.6A ; Q 0.71).Theunit...
Single-crystalstructure-re?nementandelectron-microprobeanalysisofsyntheticam- phiboleswithnominal?uoro-eckermannitecompositionanddifferenttrivalentcations(Al,3 3 3 Sc,Ti,V ,Cr ,Ga,)showsigni?cantdev...

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