In situ study of the goethite-hematite phase ...

1999-6-1  The temperature induced goethite-hematite phase transformation that occurs at about 250 degrees C was studied using in situ synchrotron X-ray powder diffraction with

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In situ study of the goethite-hematite phase ...

2013-2-16  The temperature induced goethite-hematite phase transformation that occurs at about 250 °C wasstudied using in situ synchrotron X-ray powder diffraction with a

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In situ study of the goethite-hematite phase ...

1999-5-1  Gualtieri, A. and Venturelli, P. (1999) In situ study of the goethite-hematite phase transformation by real time synchrotron powder diffraction. American Mineralogist

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(PDF) In situ study of the goethite-hematite phase ...

In situ study of the goethite-hematite phase transformation by real time synchrotron powder diffraction. Download. In situ study of the goethite-hematite phase

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In situ FTIR study on the dehydration of natural goethite ...

2006-9-1  Goethite to hematite phase transformation, though studied by many techniques over many years in situ but FTIR studies probing this transformation are limited.

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In-situ synchrotron diffraction study of the hydrothermal ...

2009-2-1  The hydrothermal crystallization of hematite (α-Fe 2 O 3) from goethite (α-FeOOH), in sodium aluminate solutions has been studied for the first time using in-situ

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On the goethite to hematite phase transformation ...

2010-4-13  This study deals with some microstructural and crystallographic aspects of the thermally induced transformation of goethite (α-FeOOH) into hematite (α-Fe 2 O 3)

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Infrared spectroscopy of goethite dehydroxylation: III. FT ...

2002-3-15  Fourier transform infrared microscopy has been used to investigate in situ dehydroxylation of goethite to form hematite. The characterisation was based on the

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On the goethite to hematite phase transformation

This study deals with some microstructural and crystallographic aspects of the thermally induced transformation of goethite (α-FeOOH) into hematite (α-Fe2O3)

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In situ XRD study of the phase transition of ...

2000-11-2  The kinetics of the phase transition from maghemite to hematite was observed by in situ XRD measurements at temperatures around 300°C. It is possible to describe

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In-situ synchrotron diffraction study of the hydrothermal ...

2009-2-1  The hydrothermal crystallization of hematite (α-Fe 2 O 3) from goethite (α-FeOOH), in sodium aluminate solutions has been studied for the first time using in-situ synchrotron time-resolved energy dispersive diffraction.This technique has allowed the transformation to be followed in real time and under the high temperature and pressure conditions (200–250 °C, 42 bar) required to allow (or ...

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Gualtieri, Alessandro F., Venturelli, Paolo (1999) In situ ...

2021-8-10  In situ study of the goethite-hematite phase transformation by real time synchrotron powder diffraction: Journal: American Mineralogist: Authors: Gualtieri, Alessandro F. Author: Venturelli, Paolo: Author: Year: 1999 (June 1) Volume: 84: Page(s) 895-904: Issue: 5: Publisher: Mineralogical Society of America: Download URL: https://rrufffo ...

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On the goethite to hematite phase transformation in ...

2010-4-13  Abstract. This study deals with some microstructural and crystallographic aspects of the thermally induced transformation of goethite (α-FeOOH) into hematite (α-Fe 2 O 3), occurring at about 300 °C.Powder specimens of goethite have been annealed in air at different temperatures, ranging from 200 °C up to 1,000 °C.

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In Situ ATR FTIR Studies of SO4 Adsorption on Goethite in ...

2019-5-25  The solid phase partitioning of SO 4 at pH 3 and pH 5 was elevated by the presence of Cu; in both cases Cu increased the affinity of SO 4 for the goethite surface. Complementary ex situ sorption edge studies of Cu on goethite in the absence and presence of SO 4 revealed that the Cu adsorption edge shifted to lower pH (6.3 → 5.6) in the ...

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Rapid dehydroxylation of nickeliferous goethite in ...

2009-12-1  Gualtieri, A.F. and Venturelli, P. (1999) In situ study of the goethite-hematite phase transformation by real time synchrotron powder diffraction. American Mineralogist, 84,

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Goethite Mineral Data

Gualtieri A , Venturelli P , American Mineralogist , 84 (1999) p.895-904, In situ study of the goethite-hematite phase transformation by real time, synchrotron powder diffraction, Sample at T = 25 C View Additional jPOWD Structure files for Goethite

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(PDF) Infrared spectroscopy of goethite dehydroxylation ...

FT-IR microscopy of in situ study of the thermal transformation of goethite to hematite April 2002 Spectrochimica Acta Part A Molecular and Biomolecular Spectroscopy 58(5):967-81

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The Mechanism of the Thermal Transformation From

Numerous articles related to study of the goethite-hematite phase transformation by thermogravimetric analysis, [21][22][23][24] [25] [26] pore morphology observation, 22,[27][28][29][30][31][32 ...

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Structural characteristics of hematite and goethite and ...

Résumé (eng) TEM investigations on goethite and hematite associated with kaolinite in lateritic weathering profiles (Cameroon) have shown : (1) the variability of goethite habit, in contrast to hematite, according to sampling locality, (2) the occurrence of intermediate phases, primary or resulting from a topotactic transformation of hematite into goethite, (3) intergrowths of hematite

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The molecular insights into protein adsorption on

2020-8-10  In this study, the adsorption of the broadly studied model protein BSA onto the hematite mineral surface was characterized as a function of pH, ionic strength, and BSA concentration using in-situ ...

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On the goethite to hematite phase transformation in ...

2010-4-13  Abstract. This study deals with some microstructural and crystallographic aspects of the thermally induced transformation of goethite (α-FeOOH) into hematite (α-Fe 2 O 3), occurring at about 300 °C.Powder specimens of goethite have been annealed in air at different temperatures, ranging from 200 °C up to 1,000 °C.

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Rapid dehydroxylation of nickeliferous goethite in ...

2009-12-1  Gualtieri, A.F. and Venturelli, P. (1999) In situ study of the goethite-hematite phase transformation by real time synchrotron powder diffraction. American Mineralogist, 84,

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In Situ ATR FTIR Studies of SO4 Adsorption on Goethite in ...

2019-5-25  The solid phase partitioning of SO 4 at pH 3 and pH 5 was elevated by the presence of Cu; in both cases Cu increased the affinity of SO 4 for the goethite surface. Complementary ex situ sorption edge studies of Cu on goethite in the absence and presence of SO 4 revealed that the Cu adsorption edge shifted to lower pH (6.3 → 5.6) in the ...

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In situ ATR FTIR studies of SO4 adsorption on goethite in ...

The solid phase partitioning of SO4 at pH 3 and pH 5 was elevated by the presence of Cu; in both cases Cu increased the affinity of SO4 for the goethite surface. Complementary ex situ sorption edge studies of Cu on goethite in the absence and presence of SO4 revealed that the Cu adsorption edge shifted to lower pH (6.3 --> 5.6) in the presence ...

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Study of the in-situ thermal transformations of Limonite ...

The goethite phase remains stable from room temperature until 200 °C. From 250 °C there is a phase transformation α-FeO(OH) → α-Fe2O3 with 8 wt % weight loss and a chromatic change, i.e., the change of the hydroxylated goethite phase (yellow) to oxided hematite phase (red), as evidenced by the TGA and evolution of the XRD profiles.

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Laihunite, goethite, jarosite, and other phases in R ...

2016-6-23  The goethite-hematite phase is believed to be the oxidation product of Fe-bearing minerals [9], although it is not clear which phase or phases were oxidized. Unlike the laihunite-like phase, the textures of goethite are consistent with in situ formation within the chondritic clasts. If clasts of different

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The Mechanism of the Thermal Transformation From

Ruan et al. [33] described the formation of hematite from goethite at 240 • C and the further development of the hematite structure from 250 • to 300 • C. De Faria and Lopes [34] and ...

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Structural characteristics of hematite and goethite and ...

Résumé (eng) TEM investigations on goethite and hematite associated with kaolinite in lateritic weathering profiles (Cameroon) have shown : (1) the variability of goethite habit, in contrast to hematite, according to sampling locality, (2) the occurrence of intermediate phases, primary or resulting from a topotactic transformation of hematite into goethite, (3) intergrowths of hematite

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In-situ study of the R3̅ to R3̅c phase transition in the ...

2000-1-1  Read "In-situ study of the R3̅ to R3̅c phase transition in the ilmenite-hematite solid solution using time-of-flight neutron powder diffraction, American Mineralogist" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

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The molecular insights into protein adsorption on

2020-8-10  In this study, the adsorption of the broadly studied model protein BSA onto the hematite mineral surface was characterized as a function of pH, ionic strength, and BSA concentration using in-situ ...

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