Synthetic aluminum-substituted maghemite samples, "g-(Fe~ _xAlx)203, have been prepared by thermal decomposition of Al-lepidocrocite (3,-Fe~_xAlxOOH), with x = 0, 0.04, 0.06, 0.14 and 0.18. The particles are needle-shaped and the mean crystallite diameter along the [311] crystallographic direction was found to be between 2.0 and 5.0 nm. MSssbauer spectra were collected at 6 K and from 80 K up to 475 K at steps of 25 K. In a wide range of temperatures the spectra of the non-substituted sample consist of a superposition of a broad sextet and a superparamagnetic doublet, whereas for the Al-maghemites this range is much smaller. From the temperature variation of the fractional doublet area two different parameters were defined: the tempe...
Several samples of large- and small-particle magnetite (Fe3O4), as well as its thermal decomposition...
Abstract--Mixtures of synthetic Al-substituted goethite (a-Feo.814AloA86OOH) and hematite (a-Fel.658...
A Mössbauer study of Fe3-xAlxO4 and Fe3-xGaxO4 has been undertaken. Measurements at low temperatures...
Abstract--Synthetic aluminum-substituted maghemite samples, "g-(Fe ~ _xAlx)203, have been prepa...
Synthetic aluminum-substituted maghemite samples, gamma-(Fe1-xAlx)(2)O-3, have been prepared by ther...
Synthetic aluminum-substituted maghemite samples, 7-(AlyFel_y)203, with y = 0, 0.032, 0.058, 0.084,...
Synthetic aluminum-substituted maghemite samples, gamma-(AlyFe1-y)(2)O-3, with y=0, 0.032, 0.058, 0....
Several Al-maghemites prepared from Al-lepidocrocites have been studied by M6ssbauer spectroscopy f...
Synthetic, relatively well-crystallized aluminum-substituted maghemite samples, y-(Aly. Fe~_y)203, ...
Abstract--Synthetic, relatively well-crystallized aluminum-substituted maghemite samples, y-(Aly. Fe...
This paper reviews a systematic M?ossbauer study of maghemite -Fe2O3 and Alsubstituted maghemites...
Synthetic aluminum-substituted maghemites were characterized by total chemical analysis, powder X-ra...
Abstract--M6ssbauer spectra of 15 hematites with A1 substitutions between 0and 10 mole % were taken ...
Seven Al-containing lepidocrocite samples, gamma-Fe1-xAlXOOH, prepared from FeCl2/Al(NO3)(3) solutio...
Several samples of large- and small-particle magnetite (Fe304), as well as its thermal decomposition...
Several samples of large- and small-particle magnetite (Fe3O4), as well as its thermal decomposition...
Abstract--Mixtures of synthetic Al-substituted goethite (a-Feo.814AloA86OOH) and hematite (a-Fel.658...
A Mössbauer study of Fe3-xAlxO4 and Fe3-xGaxO4 has been undertaken. Measurements at low temperatures...
Abstract--Synthetic aluminum-substituted maghemite samples, "g-(Fe ~ _xAlx)203, have been prepa...
Synthetic aluminum-substituted maghemite samples, gamma-(Fe1-xAlx)(2)O-3, have been prepared by ther...
Synthetic aluminum-substituted maghemite samples, 7-(AlyFel_y)203, with y = 0, 0.032, 0.058, 0.084,...
Synthetic aluminum-substituted maghemite samples, gamma-(AlyFe1-y)(2)O-3, with y=0, 0.032, 0.058, 0....
Several Al-maghemites prepared from Al-lepidocrocites have been studied by M6ssbauer spectroscopy f...
Synthetic, relatively well-crystallized aluminum-substituted maghemite samples, y-(Aly. Fe~_y)203, ...
Abstract--Synthetic, relatively well-crystallized aluminum-substituted maghemite samples, y-(Aly. Fe...
This paper reviews a systematic M?ossbauer study of maghemite -Fe2O3 and Alsubstituted maghemites...
Synthetic aluminum-substituted maghemites were characterized by total chemical analysis, powder X-ra...
Abstract--M6ssbauer spectra of 15 hematites with A1 substitutions between 0and 10 mole % were taken ...
Seven Al-containing lepidocrocite samples, gamma-Fe1-xAlXOOH, prepared from FeCl2/Al(NO3)(3) solutio...
Several samples of large- and small-particle magnetite (Fe304), as well as its thermal decomposition...
Several samples of large- and small-particle magnetite (Fe3O4), as well as its thermal decomposition...
Abstract--Mixtures of synthetic Al-substituted goethite (a-Feo.814AloA86OOH) and hematite (a-Fel.658...
A Mössbauer study of Fe3-xAlxO4 and Fe3-xGaxO4 has been undertaken. Measurements at low temperatures...