Magnetic solids

Solids—Defects. 2. Solids—Electric properties. 3. Solids—Magnetic properties. 

Two electrons with opposite spins in the same orbital are described as paired. When extended to molecules, the exclusion principle allows us to understand the pairing of electrons in covalent bonds. The net spin angular momentum of a pair of electrons is zero. If not all electrons are paired in a molecule or solid, magnetic properties arise, as happens with many compounds of transition metals. 

Figure 40. 5K (dotted) and 300 K (solid) magnetic susceptibilities of 0.20% Mn2+ ZnO nanocrystals (o) and several thin films (A-C) prepared by spin-coat processing of the nanocrystals. [Adapted from (54).]... 

Black, solid, magnetic props, recorded but not reliable. Green soln. in benzene and THF, latter decomp, to brown soln. (cf. Refs. 2, 22, 231 Reacts H, Nt, etc. 

Electronic Structure of Solids Magnetism of Transition Metal Ions Paramagnetic Organometallic Complexes. 

Chemical reagents are primarily dielectric liquids or solids. Magnetic losses are, however, observed for microwave-irradiated metal oxides, for example ferrites. As for dielectrics, a complex magnetic permeability is defined as given by Eq. (40) ... 

A modem NMR magnet and probe are shown in Fig. 3.20(a). NMR spectrometers cost from about 200,000 for a 300 MHz instmment to 1,000,000 for a high field wide bore instmment for solids. Magnetic resonance imaging (MRI) and NMR research imaging instmments cost over 3 million dollars. 

When paramagnetic complexes are condensed into a solid, magnetic interactions of several types may occur. The simplest interaction is that within isolated dimers in an insulator. In such cases a singlet-triplet behavior may be observed as for example in [NEt4][Pt(S2C2(CN)2)2], Fig. 18. Insulating columnar systems composed of paramagnetic complexes can have intrachain... 

Magnetic resonance study of transition metal ions has been a detailed and productive technique applied to the study of electron distributions and covalency in solids. Magnetic neutron diffraction is a complementary technique. 

Dotted curve is polarization Pi (x) = 0 calculated without flexomagnetic effect Q( ) = 0. Dotted and solid magnetization curves almost coincide in (b). 

McGraw-Hill Science/Engineering/Math, New York Gooch JW (1988) Development of high solids magnetic dispersions and coatings. J Coating Technol 60 757... 

Whereas catalytic applications concern the surface of the pores, many others use either the pores and their possibility of being tilled by inserted species, or the skeleton, as soon as properties close to those of dense solids (magnetism, conductivity, optical properties) are required. 

---