Susceptibility data

Magnetic susceptibility measurements were made on the several samples by the Gouy method. Susceptibility isotherms for two temperatures are shown in Fig. 9. These curves gives the susceptibility per gram of chromium in the several catalysts, as a function of chromium concentration. The expected rise of susceptibility with decreasing chromium concentration, and the position of point I are clearly shown, especially at low temperatures. In calculating the susceptibility of chromium in each sample it has been assumed that the susceptibilities of aluminum ions and oxide ions remain constant. This procedure is 

An attempt will now be made to explain the shape of the susceptibility isotherm for the chromia-alumina system in terms of the previous discussion. Provided that the Curie-Weiss law holds for this system it will be possible to determine whether the great increase of susceptibility at low concentration is due to change of oxidation state, the relaxation of 

The implications of /t and its relationship to the oxidation state of the chromium will be considered first. It will be noted that the mimetic moment is independent of the chromium concentration except at quite low concentrations. The magnetic moment has a value of about 3.2 Bohr magnetons. This could be related to an oxidation state somewhat greater than -f-3, perhaps about 3.5. 

A belief sometimes expressed by catalysis chemists is that this particular catalyst is not active unless there is present some chromium in a higher oxidation state. The presence of such oxidized chromium is readily detected by extraction of the sample with water, followed by titration of the extract with ferrous ammonium sulfate solution, followed by back titration with standard dichromate. All such tests on the catalyst samples prepared as described above were negative. Chromium in a higher oxidation state is, however, always present if the final step of reduction in hydrogen is omitted. 

One gram of CrjO contains J 52 X 6.03 X 10 X 3 = 1.19 X 10 oxide ions. The area covered by these ions will be 1.19 X 10 X 6.84 X 10 = 8.13 X 10 cm., or 813 square meters. A sample of catalyst containing 6 per cent of chromium contains 0.095 g. CraO per gram of AljOj. The maximum area which could be covered by this weight of CraOa is 77 square meters. 

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The polarizability, ionization potential, and magnetic susceptibility data from the last edition of the Landolt-Bornstein tables are given in Table I for the inert gases and for H2, Na, Ci2, and CH4. The coefficients of the dipole-dipole or R 6 potential term are... 

There will exist an equilibrium between the two states. If the ener between the two states, E, is of the order of kT, then the relative populations of the two states will vary with the temperature of the sample. In the Fe(III) dithiocarbamate series of complexes, [FeCRiRgdtcla], AE can be varied by suitable choice of substituents Ri and Rj. Although these are well removed from the FeSg molecular core, they can appreciably affect the electronic parameters of the central iron atom and of the surrounding crystal field of the sulfur atom by way of the conjugated system of the ligand (237). The results of the spin crossover are reflected in magnetic susceptibility data. 

In all cases, the high-temperature magnetic susceptibility data are consistent with Eu being all Eu. ... 

Magnetic susceptibility data are inferred to have been reflected by hydrothermal activity. The magnetic susceptibility data on the sedimentary rocks are shown in... 

Adjustments to the regimen should be made once the susceptibility data are available.2,12,28 Drug resistance should be expected in patients who have been treated previously for TB. 

Based on culture and susceptibility data (if available), are there any changes that need to be made from your initial empiric antimicrobial selection (i.e., resistance to the regimen initially selected) ... 

Fig. 21. Ethylene oxidation to ethylene oxide (O) and CO2 (O) over Pd-Ag alloy films. Magnetic susceptibility data ( ) (14%) and heats of oxygen chemisorption ( ) (.131) are also included (1S6).

Finally, we note that, to the best of our knowledge, only one report exists about EPR spectra of non-Kramers lanthanide ions in molecular magnets. In 2012, Hill and coworkers [51] performed a multifrequency study on powder and single crystal samples of NagHofWgOj H20, in both the pure form and when doped into the isostructural Y3+ derivative. While crystallizing in a triclinic unit cell, the symmetry of the lanthanide ion in this family is very close to Did. For this reason, susceptibility data had been previously fitted by a purely axial Hamiltonian [50]. 

Rotating single-crystal measurements also permitted the extraction of the orientation of the magnetic tensor in the molecular reference frame and the experimental easy axis was found to coincide with the idealized tetragonal axis of the coordination dodecahedron of Dy. Crystal field calculations assuming idealized tetragonal symmetry permitted the reproduction of magnetic susceptibility data for gz = 19.9 and gxy 0 [121]. More elaborated calculations such as ab initio post Hartree-Fock CASSCF confirmed this simple analysis [119]. 

Figure 5.3 Arrhenius plot extracted from ac susceptibility data of Er(trensal) (indicated as 1. V designates the isostructural, but diamagnetic analogue Y(trensal)). (Reprinted with permission from [13]. Copyright 2014, Royal Chemical Society.)...

Figure 10.2 Arrhenius plot of the natural logarithm of the relaxation time extracted from the ac susceptibility data as a function of the inverse temperature for 1 at different external fields as indicated. (Reprinted from Ref. [6]. Copyright (2009) American Chemical Society.)...

Table 10.2 Overview of energy barriers and pre-exponential factors derived from Arrhenius fits of the ac susceptibility data for single-molecule magnets 1-15. 

Magnetic susceptibility data for LiZn2Mo308 showed Curie-Weiss... 

In contrast, (BDTA)[Ni(dmit)2]2 has been fully characterized [89] (X-ray structure, magnetic susceptibility data, band structure and conductivity). It exhibits an SC behavior with a room-temperature conductivity of 0.1 S cm-1. Its magnetic behavior is dominated by AFM interactions, probably due to the coupling between the Ni(dmit)2 moieties. Although its properties are not spectacular, this complex is the first well-characterized example of a salt containing partially-oxidized Ni(dmit)2 moieties with a radical cation. 

When selecting antimicrobial regimens, local susceptibility data should be considered whenever possible rather than information published by other institutions or national compilations. 

The selection of a specific agent or combination should be based on culture and susceptibility data for peritonitis that occurs from chronic peritoneal dialysis. If microbiologic data are unavailable, empiric therapy should be initiated. 

Appropriate samples should be sent for culture and susceptibility testing prior to initiating therapy for all patients with active TB. This data should guide the initial drug selection for the new patient. If susceptibility data are not available, the drug resistance pattern in the area where the patient likely acquired TB should be used. 

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