Anomalous magnetic properties of the paramagnetic phase and spin polarons in manganese monosilicide

2015 ◽  
Vol 41 (12) ◽  
pp. 971-978 ◽  
Author(s):  
S. V. Demishev ◽  
T. V. Ishchenko ◽  
A. N. Samarin
Keyword(s):  
Magnetic Properties ◽  
Paramagnetic Phase ◽  
Spin Polarons

scholarly journals The Effect of Residual La on Crystal Structure and Magnetic Properties of La1+Fe11.05Si1.95 Compounds

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Vuong Van Hiep ◽  
Do Thi Kim Anh ◽  
Ngac An Bang ◽  
Sai Cong Doanh ◽  
Nguyen Duy Thien ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Phase Transitions ◽  
Curie Temperature ◽  
Lattice Constant ◽  
Paramagnetic Phase ◽  
X Ray ◽  
Curie Temperature Tc

In this paper, we present the results of the study of the effect of residual La on crystal structure, magnetic properties of La1+dFe11.05Si1.95 (d = 0.00; 0.03; 0.06 and 0.09) compounds. The analysis of X-ray diffractions showed that when the La content increases to 9%, the structure still remains cubic in a typical NaZn13 arrangement with unchanged lattice constant (about 0.5%). All compounds exhibit ferromagnetic - paramagnetic phase transitions. The Curie temperature TC increases slightly from 235 to 245 K.

Spin Polarons at High Temperatures in Undoped Lanthanum Manganites

2010 ◽  
Vol 168-169 ◽  
pp. 473-476
Author(s):  
T.I. Arbuzova ◽  
Sergey V. Naumov ◽  
Natalia V. Kostromitina
Keyword(s):  
Magnetic Properties ◽  
Curie Temperature ◽  
Cell Volume ◽  
High Temperatures ◽  
Unit Cell Volume ◽  
Paramagnetic State ◽  
Unit Cell ◽  
Temperature Range ◽  
Lanthanum Manganites ◽  
Spin Polarons

Magnetic properties of undoped samples of lanthanum manganites in the temperature range 77-650K are reported. The ferromagnetic Curie temperature increases when the unit-cell volume decreases and the number of cation defects increases. Uncorrelated polarons and noninteracting moments of Mn ions are present in the region TC < T < 440K. Above 2TC < 440 K < T, the nonstoihiometric LaMnO3 compound passes into the homogeneous paramagnetic state.

Magic hole doped composition of 152Sm1−xSrxMnO3 manganite: crystal structure and unusual magnetic properties in paramagnetic phase at x=0.45

2003 ◽  
Vol 258-259 ◽  
pp. 315-318 ◽  
Author(s):  
A.V. Lazuta ◽  
V.A. Ryzhov ◽  
A.I. Kurbukov ◽  
V.A. Trounov ◽  
I.I. Larionov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Paramagnetic Phase

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
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