Structure Refinement and Magnetic Properties of Ce2RuAl3 and a Group-Subgroup Scheme for Ce5Ru3Al2

2011 ◽  
Vol 66 ◽  
pp. 0771 ◽  
Author(s):  
T. Mishra ◽  
R.-D. Hoffmann ◽  
C. Schwickert ◽  
R. Pöttgen
Keyword(s):  
Magnetic Properties ◽  
Structure Refinement ◽  
Subgroup Scheme

ChemInform Abstract: Structure Refinement and Magnetic Properties of Ce2RuAl3 and a Group-Subgroup Scheme for Ce5Ru3Al2.

ChemInform ◽  
2011 ◽  
Vol 42 (48) ◽  
pp. no-no
Author(s):  
Trinath Mishra ◽  
Rolf-Dieter Hoffmann ◽  
Christian Schwickert ◽  
Rainer Poettgen
Keyword(s):  
Magnetic Properties ◽  
Structure Refinement ◽  
Subgroup Scheme ◽  
Abstract Structure

Structure Refinement and Magnetic Properties of Ce2RuAl3 and a Group-Subgroup Scheme for Ce5Ru3Al2

2011 ◽  
Vol 66 (8) ◽  
pp. 771-776 ◽  
Author(s):  
Trinath Mishra ◽  
Rolf-Dieter Hoffmann ◽  
Christian Schwickert ◽  
Rainer Pöttgen
Keyword(s):  
Magnetic Properties ◽  
Diffraction Data ◽  
Structure Refinement ◽  
Three Dimensional ◽  
X Ray Diffraction ◽  
Space Group ◽  
X Ray ◽  
Structural Distortions ◽  
Dimensional Network ◽  
Subgroup Scheme

The hexagonal Laves phase Ce2RuAl3 (≡ CeRu0.5Al1.5) was synthesized by high-frequencemelting of the elements in a sealed tantalum tube and subsequent annealing. The structure was refined from single-crystal X-ray diffraction data: MgZn2 type, P63/mmc, Z = 2, a = 565.38(9), c = 888.3(1) pm, wR2 = 0.0231, 193 F2 values and 13 parameters. The 2a (0.824 Ru + 0.176 Al) and 6h (0.956 Al + 0.044 Ru) Wyckoff positions show mixed occupancies leading to the composition CeRu0.48Al1.52 for the investigated crystal. The aluminum atoms build up Kagomé networks at z = 1/4 and z = 3/4 which are connected to a three-dimensional network by the ruthenium atoms. The cerium atoms fill cavities of coordination number 16 (3 Ru + 9 Al + 4 Ce) within the [RuAl3] network. The Ce2RuAl3 sample orders ferromagnetically at TC = 8.0(1) K. The cerium-rich aluminide Ce5Ru3Al2 shows unusually short Ce-Ru distances of 253 and 260 pm for the Ce1 position as a result of intermediate cerium valence. The structural distortions are discussed on the basis of a group-subgroup scheme for Pr5Ru3Al2 (space group I213) and the superstructure variant Ce5Ru3Al2 (space group R3).

Rietveld structure refinement, cation distribution and magnetic properties of Al3+ substituted NiFe2O4 nanoparticles

2011 ◽  
Vol 109 (5) ◽  
pp. 053909 ◽  
Author(s):  
S. M. Patange ◽  
Sagar E. Shirsath ◽  
G. S. Jangam ◽  
K. S. Lohar ◽  
Santosh S. Jadhav ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Cation Distribution ◽  
Structure Refinement ◽  
Nife2o4 Nanoparticles

Effects of Na-Doping on Structure and Magnetic Properties of LaCoO3

2017 ◽  
Vol 727 ◽  
pp. 403-409
Author(s):  
Yi Hao Shen ◽  
Qing Rong Yao ◽  
Peng Cheng Yang ◽  
Jian Qiu Deng ◽  
Zong Min Wang
Keyword(s):  
Magnetic Properties ◽  
Structure Refinement ◽  
Hexagonal Phase ◽  
Sol Gel ◽  
Rhombohedral Structure ◽  
Zero Field ◽  
Ferromagnetic Transition ◽  
Na Doping ◽  
Crystallite Sizes ◽  
Field Cooling

Effect of Na doping on the structural and magnetic properties of La1-xNaxCoO3 (0≤x≤0.4) nanopowder samples synthesized by sol-gel method have been investigated. Rietveld crystal structure refinement of the X-ray diffraction data shows that La1−xNaxCoO3 (x≤0.3) crystallizes in the rhombohedral structure with space group . The lattice parameters decrease and the crystallite sizes increase with the increase of x. For the sample with x=0.4, a secondary hexagonal phase NaCo2O4 was observed. The zero field cooling (ZFC) and field cooling (FC) curve of the samples (x≤0.3) exhibit a paramagnetic-ferromagnetic transition with decreasing temperature.

Magnetic Domain Structure of Nanocrystalline Zr18-xHfxCo82 Ribbons: Effect of Hf

2013 ◽  
Vol 1557 ◽  
Author(s):  
Lanping Yue ◽  
I. A. Al-Omari ◽  
Wenyong Zhang ◽  
Ralph Skomski ◽  
D. J. Sellmyer
Keyword(s):  
Magnetic Properties ◽  
Domain Structure ◽  
Structure Refinement ◽  
Magnetic Domain ◽  
Maximum Energy ◽  
Magnetic Domain Structure ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Domain Structures ◽  
Rapidly Solidified

ABSTRACTThe effect of Hf on the permanent magnetism of nanocrystalline Zr18-xHfxCo82 ribbons (x = 0, 2, 4, and 6) was investigated by magnetic properties measurement and magnetic force microscopy (MFM). Emphasis is on the local magnetic domain structures in polycrystalline rapidly solidified Zr18-xHfxCo82 ribbons for four different samples with small fractions of Hf dopants (x ≤ 6). The investigation of the magnetic properties of the Zr18-xHfxCo82 ribbons revealed that all the samples under investigation are ferromagnetic at room temperature, and the corresponding MFM images show bright and dark contrast patterns with up-down magnetic domain structures. It is found that the saturation magnetization and the coercivity depend on Hf doping concentration x in the samples. For a sample with Hf concentration x = 4, the maximum energy product (BH)max value is 3.7 MGOe. The short magnetic correlation length of 131 nm and smallest root-mean-square phase shift value of 0.680 were observed for x = 4, which suggests the refinement of the magnetic domain structure due to weak intergranular exchange coupling in this sample. The above results indicate that suitable Hf addition is helpful for the magnetic domain structure refinement, the coecivity enhancement, and the energy-product improvement of this class of rare-earth-free nanocrystalline permanent-magnet materials.

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