Thermal study of some manganese oxide minerals

1950 ◽  
Vol 29 (210) ◽  
pp. 239-251 ◽  
Author(s):  
J. Laurence Kulp ◽  
Jose N. Perfetti
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Manganese Oxide ◽  
Clay Minerals ◽  
Iron Oxides ◽  
Theoretical Background ◽  
Thermal Study ◽  
The Past ◽  
Considerable Success ◽  
Oxide Minerals

In the past decade, differential thermal analysis has developed into a very useful mineralogical technique. The theoretical background for this method has been treated by Speil, Berkelhamer, Pask, and Da vies (1945) and has been modified by Kerr and Kulp (1948, 1949). The application of the method to the clay minerals has been carried out with considerable success by a number of workers in Europe and America. In particular, Grim and co-workers (1942, 1947, 1948) have produced a number of significant papers dealing with the thermal analysis of clays. The method has been extended to other mineral groups such as the carbonates (Faust, 1949; Beck, 1946; Kerr and Kulp, 1947; Cuthbert and Rowland, 1947; Kulp, Kent, and Kerr, 1950), phosphates (Manly, 1950), sulphates (Kulp and Adler, 1950), quartz (Faust, 1948), and the hydrous iron oxides (Kulp and Trites, 1950).

INDICATION OF CESIUM ADSORPTION INTO ANGSTROM-SCALE OPEN SPACES IN SAPONITE CLAY MINERAL

2012 ◽  
Vol 11 (06) ◽  
pp. 1240034 ◽  
Author(s):  
KAZUOMI NUMATA ◽  
KIMINORI SATO ◽  
KOICHIRO FUJIMOTO
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Clay Minerals ◽  
Clay Mineral ◽  
Open Space ◽  
Vacuum Condition ◽  
Adsorption Behavior ◽  
Open Spaces

Adsorption behavior of cesium (Cs) into angstrom-scale open spaces for the saponite clay mineral is investigated by making use of positronium (Ps) annihilation spectroscopy together with thermogravimetry and differential thermal analysis (TG–DTA). Ps annihilation spectroscopy reveals two kinds of open spaces with their sizes of ~ 3 Å and ~ 10 Å, respectively, after baking at 423 K for 8 h under the vacuum condition at ~ 10-5 Torr. The large open space is found to survive for the Cs -type saponite due to less hydration of the Cs cations even after the exposure to the air for 200 h. It is thus inferred that Cs is locally adsorbed in the angstrom-scale open spaces in the saponite clay minerals.

A thermal study of thaumasite

1960 ◽  
Vol 32 (250) ◽  
pp. 567-572 ◽  
Author(s):  
M. Font-Altaba
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Differential Thermal Analysis Curve ◽  
Thermal Study ◽  
X Ray ◽  
Thermal Analysis Curve ◽  
Cell Dimensions ◽  
Endothermal Peak

SummaryA differential thermal analysis curve of thaumasite shows an endothermal peak at 206° C., correspinding to the loss of H2O and CO2, and a weak exothermal peak at 709° C., corresponding to recrystallization to a mixture of anhydrite and larnite, as is shown by X-ray powder photographs of material heated to 950° C. Improved powder data for thaumasite are given: the three strongest lines are at 9·66, 3·79, and 4·58 Å., and the cell-dimensions are a 10·992, c 10·311 Å.

Corrigendum - Transformations of clay minerals in black earth and red loams of basaltic origin.

1954 ◽  
Vol 5 (1) ◽  
pp. 98
Author(s):  
JA Ferguson
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Clay Minerals ◽  
Clay Mineral ◽  
Soil Types ◽  
X Ray Diffraction ◽  
X Ray ◽  
Partial Decomposition ◽  
Red Soils ◽  
Eastern Australia

The development in the Toowoomba area, Queensland, of red, black, and transitional soil types from basalt is typical of similar processes in many parts of eastern Australia. Systematic samples from this area have been investigated mineralogically by differential thermal analysis, X-ray diffraction, and other methods. Montmorillonite appears to be the clay mineral first formed under present weathering conditions. The further transition to red soils in certain situations is due to partial decomposition of montmorillonite to minerals of the kaolin group by loss of alkalis and iron, the latter being stabilized in the upper horizons as hydrated oxides. Further decomposition of kaolin minerals produces gibbsite. Changes in the nature and amount of clay minerals are thought to correspond with stages in the evolution of basalt soil types.

Transformations of clay minerals in black earth and red loams of basaltic origin.

1954 ◽  
Vol 5 (1) ◽  
pp. 98
Author(s):  
JA Ferguson
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Clay Minerals ◽  
Clay Mineral ◽  
Soil Types ◽  
X Ray Diffraction ◽  
X Ray ◽  
Partial Decomposition ◽  
Red Soils ◽  
Eastern Australia

The development in the Toowoomba area, Queensland, of red, black, and transitional soil types from basalt is typical of similar processes in many parts of eastern Australia. Systematic samples from this area have been investigated mineralogically by differential thermal analysis, X-ray diffraction, and other methods. Montmorillonite appears to be the clay mineral first formed under present weathering conditions. The further transition to red soils in certain situations is due to partial decomposition of montmorillonite to minerals of the kaolin group by loss of alkalis and iron, the latter being stabilized in the upper horizons as hydrated oxides. Further decomposition of kaolin minerals produces gibbsite. Changes in the nature and amount of clay minerals are thought to correspond with stages in the evolution of basalt soil types.

scholarly journals Studies on Differential Thermal Analysis Curves of Japanese Clay Minerals.,

1952 ◽  
Vol 58 (679) ◽  
pp. 115-130 ◽  
Author(s):  
Toshio SUDO ◽  
Keinosuke NAGASAWA ◽  
Morio AMAFUJI ◽  
Morihiro KIMURA ◽  
Sakuro HONDA ◽  
...  
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Clay Minerals
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