Magnetic properties and the distribution of iron ions in voltaites

1976 ◽  
Vol 54 (11) ◽  
pp. 1149-1156 ◽  
Author(s):  
Erika Hermon ◽  
Roland Haddad ◽  
David Simkin ◽  
D. E. Brandão ◽  
W. B. Muir
Keyword(s):  
Magnetic Properties ◽  
Structure Determination ◽  
Site Preference ◽  
Spin Moment ◽  
Iron Ions ◽  
Mossbauer Effect ◽  
Magnetization Measurements ◽  
X Ray ◽  
Magnetic Ions ◽  
Ferrimagnetic Ordering

Four chemically distinct iron voitaites of composition A2R52+Q33+ Al(SO4)12∙18H2O where (A, R, Q) are respectively (K, Fe, Fe) (true voltaite), (K, Fe, In), (NH4, Mn, Fe), and (Tl, Cd, Fe) were prepared by Mereiter who had previously done an X-ray structure determination on this material. These samples were studied by the Mössbauer effect to determine the site preference of Fe2+ and Fe3+ between two nonequivalent octahedrally coordinated sites M(1) and M(2): Magnetization measurements show that the magnetic ions have their free spin moment and that ferrimagnetic ordering takes place below 1 K in the cases where (A, R, Q) in the formula are (K, Fe, Fe), (NH4, Mn, Fe), and possibly in the case (Tl, Cd, Fe). The material (K, Fe, In) is antiferromagnetic with θ = −3 K.

scholarly journals The Study of Magnetic Properties for Non-Magnetic Ions Doped BiFeO3

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4061
Author(s):  
Yongtao Li ◽  
Liqing Liu ◽  
Dehao Wang ◽  
Hongguang Zhang ◽  
Xuemin He ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Local Structure ◽  
Metal Ion ◽  
Single Phase ◽  
Sol Gel ◽  
X Ray ◽  
Co Doping ◽  
Magnetic Ions ◽  
X Ray Absorption ◽  
Fe Ions

BiFeO3 is considered as a single phase multiferroic. However, its magnetism is very weak. We study the magnetic properties of BiFeO3 by Cu and (Cu, Zn). Polycrystalline samples Bi(Fe0.95Cu0.05)O3 and BiFe0.95(Zn0.025Cu0.025)O3 are prepared by the sol-gel method. The magnetic properties of BiFe0.95(Zn0.025Cu0.025)O3 are greater than that of BiFeO3 and Bi(Fe0.95Cu0.05)O3. The analyses of X-ray absorption fine structure data show that the doped Cu atoms well occupy the sites of the Fe atoms. X-ray absorption near edge spectra data confirm that the valence state of Fe ions does not change. Cu and Zn metal ion co-doping has no impact on the local structure of the Fe and Bi atoms. The modification of magnetism by doping Zn can be understood by the view of the occupation site of non-magnetically active Zn2+.

X-ray diffraction and Mössbauer effect study of site occupation and magnetic properties in UCuxFe5−xAl7 (x=2, 3.5) alloys

2009 ◽  
Vol 404 (8-11) ◽  
pp. 1102-1111 ◽  
Author(s):  
P. Gaczyński ◽  
A. Pikul ◽  
W. Suski ◽  
O. Sologub ◽  
K. Wochowski ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Mössbauer Effect ◽  
Effect Study ◽  
X Ray Diffraction ◽  
Mossbauer Effect ◽  
X Ray ◽  
Site Occupation

Synthesis, Structure Determination, and Magnetic Properties of [Cr3(dpa)4Cl2][CuCl2], a Compound Comprising a Trinuclear Chain Cation

2012 ◽  
Vol 67 (8) ◽  
pp. 759-764 ◽  
Author(s):  
Dilahan Aydin-Cantürk ◽  
Hanne Nuss Max-Planck
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Partial Oxidation ◽  
Ethyl Ether ◽  
Structure Determination ◽  
Magnetic Moment ◽  
Effective Magnetic Moment ◽  
X Ray ◽  
Weiss Constant ◽  
Paramagnetic Behavior

The new compound [Cr3(dpa)4Cl2][CuCl2] (1) (dpa = di-2,2'-pyridylamido) was synthesized by reacting Cr2(dpa)4 and anhydrous CuCl2 in dry tetrahydrofuran. Partial oxidation of Cr2(dpa)4 by Cu(II) forms Cr3+ ions, which coordinate to the free N donor atoms of the dpa ligands, and led to the formation of a trinuclear chain cation [Cr3(dpa)4Cl2]+. Recrystallization from CH2Cl2/ethyl ether yielded dark-brown, block-shaped crystals suitable for X-ray structure determination (Pccn (no. 56), a=1246:8(5), b=1487:3(3), c=2184:8(1) pm, V =4051.6(8) ·106 pm3, Z =4). The crystal structure is composed of discrete [Cr3(dpa)4Cl2]+ cations and [CuCl2]- anions. The Cr3 chain comprises quadruply-bonded diamagnetic (Cr2)4+ dimers and a pseudo-octahedrally coordinated, paramagnetic Cr3+ ion, manifesting itself in the effective magnetic moment μeff of 3:54μB (d3, S = 3=2) and the almost ideal Curie-paramagnetic behavior observed between 2 and 300 K with a Weiss constant θ = -0:25(4)K and χ0 = 4:9(7)×10-4 emu mol-1

A two-dimensional CuII–MnIIheterometallic coordination polymer: structure determination using synchrotron X-ray powder diffraction and magnetic properties

CrystEngComm ◽  
2015 ◽  
Vol 17 (38) ◽  
pp. 7423-7429 ◽  
Author(s):  
Marguerite Kalisz ◽  
Rafael A. A. Cassaro ◽  
Miguel A. Novak ◽  
Marius Andruh ◽  
Helio S. Amorim ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coordination Polymer ◽  
Powder Diffraction ◽  
Structure Determination ◽  
Polymer Structure ◽  
Two Dimensional ◽  
X Ray ◽  
Heterometallic Coordination Polymer

The structure of a magnetic two-dimensional CuII–MnIIheterometallic coordination polymer was solved by using synchrotron X-ray powder diffraction.

Order and Magnetic Properties of Fe89-xMn11Alx Alloys: Magnetization Measurements and X-Ray Diffraction.

ChemInform ◽  
2004 ◽  
Vol 35 (18) ◽  
Author(s):  
H. Bremers ◽  
J. Hesse ◽  
H. Ahlers ◽  
J. Sievert ◽  
D. Zachmann
Keyword(s):  
Magnetic Properties ◽  
X Ray Diffraction ◽  
Magnetization Measurements ◽  
X Ray

Study of Structural & Magnetic Properties of CoN Thin Films

2019 ◽  
Author(s):  
Mukul Gupta ◽  
Yogesh Kumar ◽  
Nidhi Pandey ◽  
Akhil Tayal ◽  
Wolfgang Caliebe ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Absorption Spectroscopy ◽  
Precise Determination ◽  
X Ray Diffraction ◽  
Magnetization Measurements ◽  
X Ray ◽  
X Ray Absorption ◽  
Theoretical Simulations

Precise determination of structure of CoN has been achieved combining x-ray diffraction, x-ray absorption spectroscopy measurements and theoretical simulations both at Co and N K-edges and magnetization measurements.<br>

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