scholarly journals Opaque minerals, magnetic properties, and paleomagnetism of the Tissint Martian meteorite

2013 ◽  
Vol 48 (10) ◽  
pp. 1919-1936 ◽  
Author(s):  
Jérôme Gattacceca ◽  
Roger H. Hewins ◽  
Jean-Pierre Lorand ◽  
Pierre Rochette ◽  
France Lagroix ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Martian Meteorite ◽  
Opaque Minerals

The Great Logan Paleomagnetic Loop — The Polar Wandering Path from Canadian Shield Rocks During the Neohelikian Era

1971 ◽  
Vol 8 (11) ◽  
pp. 1355-1372 ◽  
Author(s):  
W. A. Robertson ◽  
W. F. Fahrig
Keyword(s):  
Magnetic Properties ◽  
Depositional Environment ◽  
Lake Superior ◽  
Canadian Shield ◽  
Field Evidence ◽  
Polar Movement ◽  
Key Points ◽  
Grenvillian Orogeny ◽  
Opaque Minerals ◽  
Age Determinations

Normally magnetized dikes and reversely magnetized sills of Neohelikian age near the northwest shore of Lake Superior form two distinct paleomagnetic groups with mean pole positions of 179° W, 35° N, and 140° W, 47° N respectively. Thermal and alternating field demagnetization and the study of magnetic properties and opaque minerals indicate that directions of magnetization of these rocks were acquired at the time of their intrusion. Field evidence suggests that the sills are older than the dikes and radiogenic age determinations indicate that the intrusion of both occurred between 1000 and 1100 m.y. ago.These pole positions, together with those for the Franklin intrusions pole at 167° E, 08° N (675 m.y.), the Abitibi dikes, at 134° W, 27° N (1150 m.y.), and the Mackenzie igneous events, at 171° W, 4° N (1200 m.y.) are used to define the Logan Loop, the path that the pole took in Neohelikian time relative to the Canadian Shield. Other poles well defined magnetically, but less well dated, from rocks of this era, fit the curve quite well.Analysis of available data supports the hypothesis that the relative polar movement that gave rise to the Logan Loop was preceded and followed by polar stability vis à vis North America, whereas polar movement may have been quite rapid during the formation of the loop, which coincided with the time of the Grenvillian orogeny. Comparison of the depositional environment of Neohelikian rocks of the Canadian Shield with their probable paleolatitude as indicated by the 5 key points on Logan Loop should provide a test for the validity of this movement.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Microstructure in soft magnetic E3 (S1, Al) (Sendust) alloys

1988 ◽  
Vol 46 ◽  
pp. 770-771
Author(s):  
June D. Kim
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Ternary Phase Diagram ◽  
Vertical Tube ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Soft Magnetic ◽  
Quenching Temperature ◽  
Thin Foils ◽  
Vertical Tube Furnace

Iron-base alloys containing 8-11 wt.% Si, 4-8 wt.% Al, known as “Sendust” alloys, show excellent soft magnetic properties. These magnetic properties are strongly dependent on heat treatment conditions, especially on the quenching temperature following annealing. But little has been known about the microstructure and the Fe-Si-Al ternary phase diagram has not been established. In the present investigation, transmission electron microscopy (TEM) has been used to study the microstructure in a Sendust alloy as a function of temperature.An Fe-9.34 wt.% Si-5.34 wt.% Al (approximately Fe3Si0.6Al0.4) alloy was prepared by vacuum induction melting, and homogenized at 1,200°C for 5 hrs. Specimens were heat-treated in a vertical tube furnace in air, and the temperature was controlled to an accuracy of ±2°C. Thin foils for TEM observation were prepared by jet polishing using a mixture of perchloric acid 15% and acetic acid 85% at 10V and ∼13°C. Electron microscopy was performed using a Philips EM 301 microscope.

Magnetic properties of new charge-transfer complexes based on manganese porphyrins

1997 ◽  
Vol 90 (3) ◽  
pp. 407-413
Author(s):  
MARC KELEMEN ◽  
CHRISTOPH WACHTER ◽  
HUBERT WINTER ◽  
ELMAR DORMANN ◽  
RUDOLF GOMPPER ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Charge Transfer ◽  
Charge Transfer Complexes ◽  
Manganese Porphyrins

On a Theory Concerning the Sudden Loss of Magnetic Properties of Iron and Nickel

1888 ◽  
Vol 25 (648supp) ◽  
pp. 10358-10358
Author(s):  
H. Tomlinson
Keyword(s):  
Magnetic Properties ◽  
Sudden Loss

Influence of Ni-substitution on magnetic properties of annealed FeNiNbCuSiB alloys

1998 ◽  
Vol 08 (PR2) ◽  
pp. Pr2-111-Pr2-114 ◽  
Author(s):  
P. Vojtaník ◽  
E. Komová ◽  
R. Varga ◽  
R. Matejko ◽  
R. Grössinger ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ni Substitution

Effect of solute carbon present during cold rolling and annealing on the magnetic properties of electrical steels

1998 ◽  
Vol 08 (PR2) ◽  
pp. Pr2-483-Pr2-486 ◽  
Author(s):  
K. Eloot ◽  
J. Penning ◽  
J. Dilewijns
Keyword(s):  
Magnetic Properties ◽  
Cold Rolling ◽  
Electrical Steels ◽  
Cold Rolling And Annealing ◽  
Solute Carbon

Soft Co-Fe films : the structure and magnetic properties

1998 ◽  
Vol 08 (PR2) ◽  
pp. Pr2-445-Pr2-448 ◽  
Author(s):  
A. G. Ravlik ◽  
S. T. Roschenko
Keyword(s):  
Magnetic Properties
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