Synthesis of α-Fe2O3 Nanowires and its Magnetic Properties

2005 ◽  
Vol 23 ◽  
pp. 243-246 ◽  
Author(s):  
Y.W. Liu ◽  
X.F. Rui ◽  
Y.Y. Fu ◽  
Han Zhang
Keyword(s):  
Magnetic Properties ◽  
Magnetic Property ◽  
High Temperature ◽  
Low Temperature ◽  
Single Crystals ◽  
Magnetic Moment ◽  
Ferromagnetic Behavior ◽  
Fe2o3 Nanoparticle ◽  
Block Temperature ◽  
Antiferromagnetic Behavior

a-Fe2O3 nanowire was successfully synthesized by oxidation of pure iron. The as-synthesized a-Fe2O3 nanowire arrayed normal to the surface of the substrate, were perfect single crystals with diameters of 20 to 40 nm and lengths varying from 2 to 5 µm. The magnetic property of the nanowires was studied, and some interesting phenomena were observed. The magnetic moment of the nanowire shows an antiferromagnetic behavior at high temperature and a weakly ferromagnetic behavior at low temperature. The block temperature of the a-Fe2O3 nanowire was found to be significantly higher than that of a-Fe2O3 nanoparticle.

The High-Pressure Modification of CePtSn – Synthesis, Structure, and Magnetic Properties

2005 ◽  
Vol 60 (8) ◽  
pp. 821-830 ◽  
Author(s):  
Jan F. Riecken ◽  
Gunter Heymann ◽  
Theresa Soltner ◽  
Rolf-Dieter Hoffmann ◽  
Hubert Huppertz ◽  
...  
Keyword(s):  
High Pressure ◽  
Magnetic Properties ◽  
High Temperature ◽  
Magnetic Moment ◽  
Three Dimensional ◽  
Magnetic Ordering ◽  
Normal Pressure ◽  
Variable Parameters ◽  
X Ray ◽  
Experimental Magnetic Moment

The high-pressure (HP) modification of CePtSn was prepared under multianvil high-pressure (9.2 GPa) high-temperature (1325 K) conditions from the normal-pressure (NP) modification. Both modifications were investigated by powder and single crystal X-ray data: TiNiSi type, Pnma, a = 746.89(9), b = 462.88(4), c = 801.93(7) pm, wR2 = 0.0487, 452 F2 values, 20 variable parameters for NP-CePtSn, and ZrNiAl type, P6̅2m, a = 756.919(5), c = 415.166(4) pm, wR2 = 0.0546, 252 F2 values, 14 variable parameters for HP-CePtSn. Both modifications are built up from platinumcentered trigonal prisms. Together, the platinum and tin atoms form different three-dimensional [PtSn] networks in which the cerium atoms fill channels. The crystal chemistry and chemical bonding of NP- and HP-CePtSn is discussed. Susceptibility measurements of HP-CePtSn indicate Curie-Weiss behavior above 40 K with an experimental magnetic moment of 2.55(1) μB/Ce atom, indicating trivalent cerium. No magnetic ordering could be detected down to 2 K.

A low-temperature study of the magnetic properties of the molecular cations O2+, Br2+, and I2+

1989 ◽  
Vol 67 (11) ◽  
pp. 1942-1948 ◽  
Author(s):  
M. S. R. Cader ◽  
R. C. Thompson ◽  
F. Aubke
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Magnetic Moment ◽  
Photoelectron Spectroscopy ◽  
Theoretical Models ◽  
Antiferromagnetic Coupling ◽  
Paramagnetic Species ◽  
Magnetic Studies ◽  
Suggested Keywords ◽  
Molecular Cations

Magnetic susceptibility measurements to 4.2 K are reported forO2+[AsF6]−, Br2+[Sb3F16]−, and I2+[Sb2F11]−. The data are interpreted utilizing previous results from photoelectron spectroscopy, known crystal structures, magnetic studies on the superoxide ion and the ozonide ion, and in the case of O2+[AsF6]−, previous ESR studies. The magnetic properties of the three materials are quite different. Br2+[Sb3F16]− obeys Curie–Weiss law between 80 and 4 K: Cm = 0.49 ± 0.01 cm3 mol−1 K and 9 = −0.74 ± 0.01 K (with TIP = 120 × 10−6 cm3 mol−1). The magnetic moment decreases slightly from 2.04 μB at room temperature to 1.93 μB at 4 K. I2+[Sb2F11]− exhibits relatively strong antiferromagnetic coupling with a maximum in χM observed at −54 K. The magnetic moment (corrected for a TIP contribution of 68 × 10−6 cm3 mol−1) decreases from 1.92 μB at 124 K to 0.41 μB at 4 K. Experimental susceptibilities for this compound over the range 300–4 K have been compared to values calculated using three different theoretical models for extended chains of antiferromagnetically coupled paramagnetic species. O2+[AsF6]− exhibits Curie–Weiss behaviour over the range 60–2 K (Cm = 0.34 ± 0.01 cm3 mol−1 K, θ = −1.90 ± 0.01 K). The magnetic moment, uncorrected for TIP, varies from 1.63 μB at 80 K to 1.17 μB at 2 K, and the presence of weak antiferromagnetic coupling in this material is suggested. Keywords: magnetic susceptibilities, dihalogen cations, dioxygenyl cation, low temperature behaviour.

On the low-temperature magnetic properties of CuO single crystals

1992 ◽  
Vol 4 (5) ◽  
pp. 1359-1366 ◽  
Author(s):  
C B Azzoni ◽  
A Paleari ◽  
G B Parravicini
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Single Crystals

Crystal Structure and Magnetic Properties of the Novel Hollandite Ba1.3Co1.3Ti6.7O16

2011 ◽  
Vol 66 (11) ◽  
pp. 1097-1100 ◽  
Author(s):  
Larysa Shlyk ◽  
Rainer Niewa
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Single Crystals ◽  
Magnetic Moment ◽  
High Spin State ◽  
The Novel ◽  
Charge Balance ◽  
Vertex Sharing ◽  
State Spin

Single crystals of the new barium hollandite Ba1.3Co1.3Ti6.7O16 were obtained from a BaCl2 flux (I2/m, Z = 1, a = 9.9470(4), b = 2.9714(2), c = 10.2260(5) Å , β = 90.906(2)◦). In the crystal structure piles of Ba atoms are situated within a framework of edge- and vertex-sharing octahedra (Co,Ti)O6. The composition was deduced from microprobe analyses, structure refinements and charge balance arguments in agreement with the observed magnetic properties. The temperature dependence of the magnetic susceptibility χ(T) of Ba1.3Co1.3Ti6.7O16 single crystals reveals paramagnetism down to 2 K. The value of the Co magnetic moment deduced from the Curie-Weiss law agrees well with the theoretical value of the high-spin state spin-only moment of μeff = 3.87 μB for Co2+ (S = 3/2)

scholarly journals Low-temperature magnetic properties and high-temperature diffusive behavior ofLiNiO2investigated by muon-spin spectroscopy

2010 ◽  
Vol 82 (22) ◽  
Author(s):  
Jun Sugiyama ◽  
Yutaka Ikedo ◽  
Kazuhiko Mukai ◽  
Hiroshi Nozaki ◽  
Martin Månsson ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
High Temperature ◽  
Low Temperature ◽  
Muon Spin ◽  
Diffusive Behavior ◽  
Muon Spin Spectroscopy

EFFECT OF Fe DEFICIENCY ON STRUCTURAL AND MAGNETIC PROPERTIES IN LOW TEMPERATURE SYNTHESIZED Mg-Mn FERRITE

2011 ◽  
Vol 10 (06) ◽  
pp. 1257-1263 ◽  
Author(s):  
NILAR LWIN ◽  
M. N. AHMAD FAUZI ◽  
SRIMALA SREEKANTAN ◽  
RADZALI OTHMAN ◽  
AYE AYE THANT
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Synthesis Method ◽  
Diffraction Method ◽  
Decomposition Temperature ◽  
Ferromagnetic Behavior ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
Fe Content ◽  
Time And Energy

Magnesuim Manganese ferrite powders of Mg 0.9 Mn 0.1 Fe 2-x O 4 [x = 0.2, 0.4, 0.6, 0.8] compositions were synthesized by citrate precursor method at low temperature. The decomposition temperature, phase formation and microstructure were characterized by Thermogravimetrical Analysis (TGA), X-ray diffraction method (XRD) and field emission scanning electron microscopy (FESEM), respectively. The density and porosity of sintered pellets were measured by Archimedes' method. The synthesized powders showed fine agglomerated particles with the crystallite size in the range of 15–25 nm. The size of the particle was found to decrease with Fe content. The XRD results of the calcined powders at 500°C for all compositions revealed the formation of single phase cubic spinel structure. The grain size of the pellets sintered at 1250°C was in the range of ~ 0.05 to 0.08 μm which is smaller than that obtained for ferrites prepared by the conventional ceramic method. The observed variations in magnetic properties were investigated by Vibrating Sample Magnetometer (VSM) and the results of magnetization exhibit collinear ferromagnetic behavior. This synthesis method is relatively simple, economical, time and energy saving for mass production.

scholarly journals MAGNETIC PROPERTIES OF SINGLE CRYSTALS (MnIn2S4)1–х–(AgIn5S8)х SOLID SOLUTIONS

Doklady BGUIR ◽  
2019 ◽  
pp. 95-99
Author(s):  
I. V. Bodnar ◽  
Bin Tkhan Chan
Keyword(s):  
Magnetic Properties ◽  
Magnetic Fields ◽  
Single Crystals ◽  
Solid Solutions ◽  
Magnetic Moment ◽  
Temperature Range ◽  
Bridgeman Method ◽  
The Given ◽  
Specific Magnetic Moment

Single crystals of solid solutions (MnIn2S4)1-х–(AgIn5S8)х have been grown with the Bridgeman method in the whole range of temperatures. The crystals structure and composition were determined. The study of the given single crystals in the temperature range 2–300 К and magnetic fields to 10 T was carried out. It is set that the given crystals are paramagnetic in the whole studied range. The specific magnetic moment increases with the temperature.  

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