SITE OCCUPANCY OF Fe ATOM IN RFe4+xAl8-x (R = Gd, Er, Y) AND THEIR MAGNETIC PROPERTIES

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-381-C8-382
Author(s):  
T. Kamimori ◽  
W. L. Liu ◽  
H. Kadomatsu ◽  
M. Goto ◽  
H. Fujiwara
Keyword(s):  
Magnetic Properties ◽  
Site Occupancy

scholarly journals EFFECT OF Mn AND Ti ADDITION ON THE CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF SrFe12O19

2020 ◽  
Vol 82 (4) ◽  
Author(s):  
Wisnu Ari Adi ◽  
Yunasfi Yunasfi ◽  
Yosef Sarwanto ◽  
Muhammad Aziz Majidi
Keyword(s):  
Magnetic Properties ◽  
Raw Materials ◽  
Site Occupancy ◽  
Crystallographic Structure ◽  
X Ray Diffraction ◽  
Mixed Powder ◽  
Total Magnetization ◽  
Multi Phase ◽  
Ti Addition

The synthesis and characterization of composition SrFe12-(x+y)MnxTiyO19 (x = y and x ≠ y) compound by using solid state reaction have been performed. The raw materials were SrCO3, Fe2O3, MnCO3, and TiO2. The mixed powder was compacted at 5000 psi into pellets and sintered at 1050°C in the air at atmosphere pressure for 15 hours and furnace cooling. The refinement results of x-ray diffraction pattern show that the doping composition (x = y) was a single phase while the doping composition (x ≠ y) was multi phase. We concluded that effect of substitution upon magnetic properties revealed that total magnetization, remanence and coercivity changed with substitution due to preferential site occupancy of substituted Mn2+ and Ti4+ ions. The coercivity decreases with increase in Mn and Ti concentration. This effect is related with Fe3+ magnetic moment changes after they have already substituted Mn2+ and Ti4+ ions. Since the coercivity and total magnetization may be controlled by substitution while maintaining resistive properties, making this material useful for microwave absorber. 

Site occupancy and magnetic properties of pyrochlore-structured AgOs2O6

2012 ◽  
Vol 24 (38) ◽  
pp. 385701
Author(s):  
G J Shu ◽  
S L Hsu ◽  
M-W Chu ◽  
C C Lee ◽  
F C Chou
Keyword(s):  
Magnetic Properties ◽  
Site Occupancy

scholarly journals Effects of In3+ site occupancy on the magnetic properties of M-type strontium hexaferrites

AIP Advances ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 015040
Author(s):  
Chul Sung Kim ◽  
Bongjae Kim ◽  
Sunghyun Yoon
Keyword(s):  
Magnetic Properties ◽  
Site Occupancy ◽  
Strontium Hexaferrites

scholarly journals Site occupancy and magnetic properties of Al-substituted M-type strontium hexaferrite

2015 ◽  
Vol 117 (24) ◽  
pp. 243904 ◽  
Author(s):  
Vivek Dixit ◽  
Chandani N. Nandadasa ◽  
Seong-Gon Kim ◽  
Sungho Kim ◽  
Jihoon Park ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Site Occupancy ◽  
Strontium Hexaferrite

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.

High-resolution structure determination by ALCHEMI

1983 ◽  
Vol 41 ◽  
pp. 178-181 ◽  
Author(s):  
Peter G. Self ◽  
Peter R. Buseck
Keyword(s):  
Site Occupancy ◽  
Real Space ◽  
Unit Cell ◽  
Bragg Angle ◽  
Electron Current ◽  
High Resolution Structure ◽  
Beam Incident ◽  
Crystallographic Planes ◽  
Electron Beam Incident ◽  
Resolution Structure

ALCHEMI (Atom Location by CHanneling Enhanced Microanalysis) enables the site occupancy of atoms in single crystals to be determined. In this article the fundamentals of the method for both EDS and EELS will be discussed. Unlike HRTEM, ALCHEMI does not place stringent resolution requirements on the microscope and, because EDS clearly distinguishes between elements of similar atomic number, it can offer some advantages over HRTEM. It does however, place certain constraints on the crystal. These constraints are: a) the sites of interest must lie on alternate crystallographic planes, b) the projected charge density on the alternate planes must be significantly different, and c) there must be at least one atomic species that lies solely on one of the planes.An electron beam incident on a crystal undergoes elastic scattering; in reciprocal space this is seen as a diffraction pattern and in real space this is a modulation of the electron current across the unit cell. When diffraction is strong (i.e., when the crystal is oriented near to the Bragg angle of a low-order reflection) the electron current at one point in the unit cell will differ significantly from that at another point.

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