Zobrazeno 1 - 10
of 72
pro vyhledávání: '"L H, Bowen"'
Publikováno v:
Soil Science Society of America Journal. 60:309-315
Thousands of hectares of forests are burned annually in wildfires and prescribed burns nationwide. Our objective was to determine the effects of such fires on soil phyllosilicates. At five sites throughout California representing Inceptisols, Andisol
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50079b9eb2a56d0fbcd2c2901c52b194
https://doi.org/10.2136/sssaj1996.03615995006000010047x
https://doi.org/10.2136/sssaj1996.03615995006000010047x
Publikováno v:
Clays and Clay Minerals. 44:214-219
Seven Al-containing lepidocrocite samples, gamma-Fe1-xAlXOOH, prepared from FeCl2/Al(NO3)(3) solutions with initial Al/(Al + Fe) mole ratios C-i of 0.0025, 0.01, 0.025, 0.05, 0.075, 0.10 and 0.15 mol/mol, were examined by means of Mossbauer spectrosc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::707d411c7d175d2189be79bcbead622a
https://doi.org/10.1346/ccmn.1996.0440206
https://doi.org/10.1346/ccmn.1996.0440206
Publikováno v:
Physics and Chemistry of Minerals. 22:178-185
Synthetic aluminum-substituted maghemite samples, γ-(Al y Fe1-y )2O3 with y=0, 0.032, 0.058, 0.084, 0.106 and 0.151 have been studied by Mossbauer spectroscopy at 8 K and in the range 80 K to 475 K at steps of 25 K. The spectra have been analysed as
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::142b656200511b7df7cdb593b6f75cc4
https://doi.org/10.1007/bf00202298
https://doi.org/10.1007/bf00202298
Publikováno v:
Clays and Clay Minerals. 43:562-568
Synthetic aluminum-substituted maghemite samples, gamma-(Fe1-xAlx)(2)O-3, have been prepared by thermal decomposition of Al-lepidocrocite (gamma-Fe1-xAlxOOH), with x = 0, 0.04, 0.06, 0.14 and 0.18. The particles are needle-shaped and the mean crystal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ace1246085f3ed21c3e51fdd0d0a2c31
https://doi.org/10.1346/ccmn.1995.0430506
https://doi.org/10.1346/ccmn.1995.0430506
Autor:
E. De Grave, L. H. Bowen
Publikováno v:
Journal of Magnetism and Magnetic Materials. 139:6-10
Six synthetic α-Fe 2 O 3 powder samples with Al substituted for Fe in the range 9.5–28.1 mol% have been studied by Mossbauer spectroscopy at 4 K in an external field of 60 kOe applied parallel to the γ-ray beam. These samples are all in the weakl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::47bb401097ce97782fff040a7edef597
https://doi.org/10.1016/0304-8853(95)90022-5
https://doi.org/10.1016/0304-8853(95)90022-5
Publikováno v:
Clays and Clay Minerals. 43:1-7
In a previous paper, we used powder X-ray diffraction and changes in magnetic susceptibility to argue the importance of pedogenic maghemite to soils and the efficacy of the chemical extractant citrate-bicarbonate-dithionite (CBD) to preferentially re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::187ebb806bcdba73893c6eb640dbfbc6
https://doi.org/10.1346/ccmn.1995.0430101
https://doi.org/10.1346/ccmn.1995.0430101
Publikováno v:
Hyperfine Interactions. 94:1977-1982
A series of hematites with up to 15 mol% Al substitution was converted to maghemites by reduction in the presence of organic matter, followed by slow oxidation. The maghemites formed were studied by Mossbauer spectroscopy in an external field of 60 k
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5675191a3d23ea13082fa13a5b7c7ed3
https://doi.org/10.1007/bf02063726
https://doi.org/10.1007/bf02063726
Publikováno v:
Hyperfine Interactions. 94:1983-1987
Several Al-maghemites prepared from Al-lepidocrocites have been studied by Mossbauer spectroscopy from 6 to 300 K, and also at 4.2 K with an applied field of 6 T. A linear decrease in the A and B site fields at 4.2 K for samples containing up to 10%
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::26e3c6fccfe950f382cdae7e6ef5275e
https://doi.org/10.1007/bf02063727
https://doi.org/10.1007/bf02063727
Publikováno v:
Clays and Clay Minerals. 42:628-633
Synthetic, relatively well-crystallized aluminum-substituted maghemite samples, y-(Aly. Fe~_y)203, with y = 0, 0.032, 0.058, 0.084, 0.106 and 0.151 have been studied by X-ray diffraction and zero-field Mrssbauer spectroscopy in the range 8 K to 475 K
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6c6928698feb3f604005beb42277d74
https://doi.org/10.1346/ccmn.1994.0420515
https://doi.org/10.1346/ccmn.1994.0420515
Publikováno v:
Clays and Clay Minerals. 42:53-62
Submicron-sized (~3–60 nm) powders of Al-substituted magnetite were synthesized in the laboratory by precipitation methods by mixing appropriate molar volumes FeCl2, FeCl3 and AlCl3 solutions and precipitating with 20% NH4OH. Precipitates were dial
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7d895c4dfc46c034ae3f734387488ad4
https://doi.org/10.1346/ccmn.1994.0420107
https://doi.org/10.1346/ccmn.1994.0420107