Gravity and magnetic features as related to geology in the Leadville 30-minute Quadrangle, Colorado

1972 ◽  
Author(s):  
Ogden Tweto ◽  
James E. Case
Keyword(s):  
Gravity And Magnetic ◽  
Magnetic Features

Dislocations, Ordering and Antiferromagnetic Domains in MnO

1970 ◽  
Vol 28 ◽  
pp. 522-523
Author(s):  
D. J. Barber ◽  
R. G. Evans
Keyword(s):  
Electron Diffraction ◽  
Single Crystal ◽  
Optical Microscopy ◽  
Defect Chemistry ◽  
Magnetic Structures ◽  
Optically Transparent ◽  
Magnetic Features ◽  
Antiferromagnetic Domains

Manganese (II) oxide, MnO, in common with CoO, NiO and FeO, possesses the NaCl structure and shows antiferromagnetism below its Neel point, Tn∼ 122 K. However, the defect chemistry of the four oxides is different and the magnetic structures are not identical. The non-stoichiometry in MnO2 small (∼2%) and below the Tn the spins lie in (111) planes. Previous work reported observations of magnetic features in CoO and NiO. The aim of our work was to find explanations for certain resonance results on antiferromagnetic MnO.Foils of single crystal MnO were prepared from shaped discs by dissolution in a mixture of HCl and HNO3. Optical microscopy revealed that the etch-pitted foils contained cruciform-shaped precipitates, often thick and proud of the surface but red-colored when optically transparent (MnO is green). Electron diffraction and probe microanalysis indicated that the precipitates were Mn2O3, in contrast with recent findings of Co3O4 in CoO.

Gravity and Magnetic Investigations of the Mojave National Preserve and Adjacent Areas, California and Nevada

2009 ◽  
Author(s):  
V.E. Langenheim ◽  
S. Biehler ◽  
R. Negrini ◽  
K. Mickus ◽  
D.M. Miller ◽  
...  
Keyword(s):  
Gravity And Magnetic ◽  
National Preserve
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