Synthesis of nickel selenites, their solubility and bonding in them

1982 ◽  
Vol 47 (8) ◽  
pp. 2069-2076 ◽  
Author(s):  
Miroslav Ebert ◽  
Zdeněk Mička ◽  
Ilona Peková
Keyword(s):  
Magnetic Properties ◽  
Hydrogen Bonding ◽  
Solubility Diagram ◽  
Reflectance Spectroscopy ◽  
Chloride Anion ◽  
Fluoride Anion ◽  
Infrared Absorption Spectroscopy ◽  
Magnetic Parameters ◽  
Nickel Cation ◽  
Spectrochemical Series

The solubility diagram of the NiSeO3-SeO2-H2O system at 25 °C was studied, and on its basis, Ni(HSeO3)2.2 H2O was prepared. This selenite and NiSeO3.2 H2O were investigated by infrared absorption spectroscopy and by electronic reflectance spectroscopy and their magnetic properties were determined. Based on the infrared spectra, the force constants of the selenium-oxygen bonds were determined and the hydrogen bonding was characterized. The electronic reflectance spectra and the magnetic parameters indicate an octahedral arrangement of the coordination sphere of the nickel cation and characterize the selenite anion as a ligand that in the spectrochemical series assumes a position between the fluoride anion and water and in the nephelauxetic series, between ethylenediamine and the chloride anion.

scholarly journals Inductive Thermal Effect of Ferrite Magnetic Nanoparticles

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3208 ◽  
Author(s):  
Jeotikanta Mohapatra ◽  
Meiying Xing ◽  
J. Ping Liu
Keyword(s):  
Magnetic Properties ◽  
Magnetic Nanoparticles ◽  
Spinel Ferrite ◽  
Particle Interactions ◽  
Heat Induction ◽  
Heating Efficiency ◽  
Magnetic Parameters ◽  
Thermally Activated ◽  
Cell Functions ◽  
Magnetic Heating

Localized heat induction using magnetic nanoparticles under an alternating magnetic field is an emerging technology applied in areas including, cancer treatment, thermally activated drug release and remote activation of cell functions. To enhance the induction heating efficiency of magnetic nanoparticles, the intrinsic and extrinsic magnetic parameters influencing the heating efficiency of magnetic nanoparticles should be effectively engineered. This review covers the recent progress in the optimization of magnetic properties of spinel ferrite nanoparticles for efficient heat induction. The key materials factors for efficient magnetic heating including size, shape, composition, inter/intra particle interactions are systematically discussed, from the growth mechanism, process control to chemical and magnetic properties manipulation.

scholarly journals Improvement of Thermal Stability of Nd-Tb-Fe-Co-B Sintered Magnets by Additions of Pr, Ho, Al, and Cu

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
A. A. Lukin ◽  
E. I. Il'yashenko ◽  
A. T. Skjeltorp ◽  
G. Helgesen
Keyword(s):  
Heat Treatment ◽  
Thermal Stability ◽  
Magnetic Properties ◽  
Thermal Treatment ◽  
Temperature Interval ◽  
Magnetic Parameters ◽  
Sintered Magnets ◽  
Additional Doping ◽  
As Solubility ◽  
Thermal Stability Of

The present work investigates the influence of Pr, Al, Cu, B and Ho which were introduced into the Co-containing sintered magnets of Nd-Dy-Tb-Fe-Co-B type on the magnetic parameters (α, Hci, Br, BHmax⁡). The effect of heat treatment parameters on magnetic properties was also studied. It was revealed that the essential alloying of NdFeB magnets by such elements as Dy, Tb, Ho, Co as well as by boron-forming elements, for example, by titanium, may lead to reducing of F-phase quantity, and, as a consequence, to decreasing of magnetic parameters. It was also shown that additional doping of such alloys by Pr, B, Al and Cu leads to a significant increase of the quantity of F-phase in magnets as well as solubility of the Dy, Tb, Ho and Co in it. This promotes the increase of magnetic parameters. It was possible to attain the following properties for the magnets (Nd0,15Pr0,35Tb0,25Ho0,25)15(Fe0,71Co0,29)bal ⋅ Al0,9Cu0,1B8,5 (at. %) after optimal thermal treatment {1175 K (3,6–7,2 ks) with slow (12–16 ks) cooling to 675 K and subsequently remaining at T=775 K for 3,6 ks—hardening}: Br=0,88 T, Hci=1760 kA/m, BHmax⁡=144 kJ/m3, α<|0,01|%/K in the temperature interval 223–323 K.

A series of divalent metal coordination polymers based on isomeric tetracarboxylic acids: synthesis, structures and magnetic properties

2014 ◽  
Vol 43 (46) ◽  
pp. 17519-17527 ◽  
Author(s):  
Min-Le Han ◽  
Ya-Ping Duan ◽  
Dong-Sheng Li ◽  
Guo-Wang Xu ◽  
Ya-Pan Wu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Hydrogen Bonding ◽  
Coordination Polymers ◽  
Divalent Metal ◽  
Metal Coordination ◽  
3D Network ◽  
Supramolecular Networks ◽  
Metal Coordination Polymers ◽  
1D Chains

A series of M(ii) coordination polymers has been synthesized. 1–3 contain 1D infinite chains, and these 1D chains are further linked by hydrogen bonding to form 3D supramolecular networks. While 4 and 5 show tetra- or penta-nodal 3D network, respectively.

Fluoride anion sensing mechanism of a BODIPY-linked hydrogen-bonding probe

2018 ◽  
Vol 39 (21) ◽  
pp. 1639-1647 ◽  
Author(s):  
Yang Li ◽  
Junsheng Chen ◽  
Tian-Shu Chu
Keyword(s):  
Hydrogen Bonding ◽  
Fluoride Anion ◽  
Anion Sensing ◽  
Sensing Mechanism
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