Enthalpy Landscapes of the Earth Alkaline Metal Oxides

2004 ◽  
Vol 630 (13-14) ◽  
pp. 2354-2366 ◽  
Author(s):  
J. C. Sch�n
Keyword(s):  
Metal Oxides ◽  
Alkaline Metal ◽  
The Earth

Neues über ternäre Interalkalimetalloxide und Alkalithallium(I)-oxide / News About Ternary Inter Alkaline Metal Oxides and Alkalinethallium(I)oxides

1985 ◽  
Vol 40 (1) ◽  
pp. 122-123 ◽  
Author(s):  
Horst Sabrowsky ◽  
Petra Mertens ◽  
Fritz Otto Dönhoff
Keyword(s):  
Metal Oxides ◽  
Lithium Atom ◽  
Unit Cell ◽  
Alkaline Metal ◽  
X Ray ◽  
The Third ◽  
Unit Cells ◽  
Alkaline Oxides

Besides KNaO and RbNaO, KLiO is the third example of hitherto unknown and unexpected in- teralkaline metal oxides. The X-ray investigation of the orthorhombic KLiO (Z=8) shows a new structure with separated layers of [xxx] anions in which every lithium atom is co-ordinated by a triangle of three oxygens.The compounds KTlO, RbTlO and CsTlO are already known. Now serveral new ternary alkaline oxides with monovalent thallium have been obtained. In the Na2O-Tl2O system the red compounds NaTlO and Na3TlO2 were found. Further- more KTl3O2, RbTl3O2 and CsTl3O2 have been prepared. Their unit cells (Z=3) correlate to the unit cell of hexagonal Tl2O (Z=6)

scholarly journals Identification of promising chemical systems for the synthesis of new materials structure types: An ab initio minimization data mining approach

2013 ◽  
Vol 7 (1) ◽  
pp. 37-41 ◽  
Author(s):  
Dejan Zagorac ◽  
Johann Schön ◽  
Martin Jansen
Keyword(s):  
Ab Initio ◽  
Theoretical Work ◽  
Structure Type ◽  
Alkaline Metal ◽  
New Materials ◽  
Chemical Systems ◽  
Data Mining Approach ◽  
The Earth ◽  
Alkali Metal Halides ◽  
Binary Compounds

In this research we performed data exploring for binary compounds with elements from groups V, IV-VI, and III-VII, with the goal to identify chemical systems where the recently proposed ?5-5? structure type might be experimentally accessible. Among others, TlF, SnO, SnS, SnSe, GeS, GeSe, PbO, PbS, ZnO and ZnS, were chosen for the study. For each of these systems, a local optimization on ab initio level with the LDA functional was performed for the 5-5 structure type, plus other experimentally observed and theoretically proposed structure types, for comparison. Afterwards, the results were combined with earlier theoretical work involving the 5-5 structure in the earth alkaline metal oxides and the alkali metal halides. As a result, we suggest the GeSe and the ZnO systems as the most suitable ones for synthesizing the 5-5 structure type.

Surface properties of gas phase deposited mixed earth alkaline metal oxides

1997 ◽  
Vol 19 (11) ◽  
pp. 1687-1693 ◽  
Author(s):  
P. Hofmann ◽  
E. Knözinger
Keyword(s):  
Metal Oxides ◽  
Gas Phase ◽  
Surface Properties ◽  
Alkaline Metal

scholarly journals Theoretical Insights into Methane C–H Bond Activation on Alkaline Metal Oxides

2017 ◽  
Vol 121 (30) ◽  
pp. 16440-16446 ◽  
Author(s):  
Hassan Aljama ◽  
Jens K. Nørskov ◽  
Frank Abild-Pedersen
Keyword(s):  
Metal Oxides ◽  
Bond Activation ◽  
Alkaline Metal

Formation of saponite by hydrothermal alteration of metal oxides: Implication for the rarity of hydrotalcite

2019 ◽  
Vol 104 (8) ◽  
pp. 1156-1164
Author(s):  
Qi Tao ◽  
Qingjin Zeng ◽  
Manyou Chen ◽  
Hongping He ◽  
Sridhar Komarneni
Keyword(s):  
Metal Oxides ◽  
Carbon Cycling ◽  
Hydrothermal Alteration ◽  
Chemical Stability ◽  
Negative Charge ◽  
Solid Phase ◽  
Isomorphous Substitution ◽  
Metal Availability ◽  
The Earth ◽  
High Concentrations

AbstractConversion of hydrotalcite (Ht) to saponite was observed by hydrothermal alkaline alteration of metal oxides. The conversion was through a pathway of hydration-dissolution-precipitation. It involved several critical steps, including the construction of Ht from metal oxides, dissolution of Al3+ from Ht, condensation of metasilicate anions with Ht, and finally crystallization of saponite. The condensation was favored by relatively low Mg/Al ratios of Ht, along with high concentrations of Al3+ and silicate oligomers in the environment, resulting in highly crystalline saponite. The latter conversion was greatly accelerated by the isomorphous substitution of Al3+ for Si4+ in silicate oligomers. The substitution generated the extra negative charge and led to the aforementioned condensation with Ht surface, thereby promoting the formation of saponite TOT layers. During the process, CO2 is an indispensable component. Initially intercalated as CO32− to form Ht, CO2 was subsequently eliminated from the solid phase, and saponite formed when the layer charge was reversed. Thus, this study presents a novel formation mechanism of saponite from metal oxides via hydrotalcite and contributes to a better understanding of the crystallization, chemical stability, and transformation of Ht to saponite. The results are also relevant to evaluating metal availability and carbon cycling on the surface of the Earth.

Magnetic Collapse in Transition Metal Oxides at High Pressure: Implications for the Earth

Science ◽  
1997 ◽  
Vol 275 (5300) ◽  
pp. 654-657 ◽  
Author(s):  
R. E. Cohen
Keyword(s):  
High Pressure ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
The Earth

Effect of alkaline metal oxides on the adsorption of SO2 by activated carbons

1995 ◽  
pp. 1827-1830
Author(s):  
M.A. Alvarez-Merino ◽  
F. Carrasco-Marín ◽  
C. Moreno-Castilla.
Keyword(s):  
Metal Oxides ◽  
Activated Carbons ◽  
Alkaline Metal

The motion of a lunar orbiter

1966 ◽  
Vol 25 ◽  
pp. 373
Author(s):  
Y. Kozai
Keyword(s):  
Degrees Of Freedom ◽  
Dimensional Space ◽  
Artificial Satellite ◽  
Equations Of Motion ◽  
Triaxial Ellipsoid ◽  
The Moon ◽  
Secular Motion ◽  
The Earth ◽  
Close Satellite ◽  
The Mean

The motion of an artificial satellite around the Moon is much more complicated than that around the Earth, since the shape of the Moon is a triaxial ellipsoid and the effect of the Earth on the motion is very important even for a very close satellite.The differential equations of motion of the satellite are written in canonical form of three degrees of freedom with time depending Hamiltonian. By eliminating short-periodic terms depending on the mean longitude of the satellite and by assuming that the Earth is moving on the lunar equator, however, the equations are reduced to those of two degrees of freedom with an energy integral.Since the mean motion of the Earth around the Moon is more rapid than the secular motion of the argument of pericentre of the satellite by a factor of one order, the terms depending on the longitude of the Earth can be eliminated, and the degree of freedom is reduced to one.Then the motion can be discussed by drawing equi-energy curves in two-dimensional space. According to these figures satellites with high inclination have large possibilities of falling down to the lunar surface even if the initial eccentricities are very small.The principal properties of the motion are not changed even if plausible values ofJ3andJ4of the Moon are included.This paper has been published in Publ. astr. Soc.Japan15, 301, 1963.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Origin of the Moon

1962 ◽  
Vol 14 ◽  
pp. 149-155 ◽  
Author(s):  
E. L. Ruskol
Keyword(s):  
Chemical Composition ◽  
Solar System ◽  
The Moon ◽  
The Earth ◽  
The Difference ◽  
Origin Of The Moon

The difference between average densities of the Moon and Earth was interpreted in the preceding report by Professor H. Urey as indicating a difference in their chemical composition. Therefore, Urey assumes the Moon's formation to have taken place far away from the Earth, under conditions differing substantially from the conditions of Earth's formation. In such a case, the Earth should have captured the Moon. As is admitted by Professor Urey himself, such a capture is a very improbable event. In addition, an assumption that the “lunar” dimensions were representative of protoplanetary bodies in the entire solar system encounters great difficulties.

Sign in / Sign up

Export Citation Format

Share Document