Materials Literature
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The x-ray structure of a short-chain dehydrogenase, the bacterial holo 3 alpha,20 beta-hydroxysteroid dehydrogenase (EC 1.1.1.53), is described at 2.6 A resolution. This enzyme is active as a tetramer and crystallizes with four identical subunits in the asymmetric unit. It has the alpha/beta fold characteristic of the…
The high (BH)max potential of Nd-Fe-B materials make them excellent candidates for bonded magnets. We have previously shown that anisotropic bonded magnets can be made from hot deformed rapidly solidified materials. The purpose of this paper is to show how hot deformed materials can be pulverized into desired particle…
The lattice parameters and the saturation magnetization are measured for the series of intermetallic compounds A(Fe,B)2, A=Zr, Hf and B=Si and Al, with concentrations less than 15%. The magnetization measurements and the lattice parameter behavior are qualitatively discussed.
[C2sH 32 Fe2 N6 ° 5]( C10 4)2.0.9( C3H60 ) CROMER, D. T. (1974). International Tables for X-ray Crystal- lography, Vol. IV, Table 2.3.1 Birmingham: Kynoch Press. CROMER, D. T. & WABER, J. T. (1974). International Tables for X-ray Crystallography, Vol. IV, Table 2.2B. Birmingham; Kynoch Press. (Present distributor Kluw…
Melt-spun Nd-Fe-B ribbons are limited to remanences of about 8 kG by the random orientation of the Nd2Fe14B grains. Hot deformation (die upsetting) causes these grains to reorient with the c axis aligned along the press direction, resulting in a 50% increase in the remanence (12 kG). Previously others have produced ma…
Magnetic properties of RTiCo11 (R=Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, and Er) compounds with the ThMn12 structure were investigated in the temperature range from 4.2 to 1400 K. The Curie temperatures of this series exceed 1000 K and the Co atomic moments were found to take the values ranging from 0.99 to 1.80 μB, w…
The magnetic and structural properties of Co100−xMnx alloys have been studied in the range 0≤x≤50 at. %. The structural phase diagram, which was revised with the aid of resistivity and thermal-expansion measurements for 4<T<1200 K, shows that the fcc↔hcp (γ↔ε) martensitic transformation temperature in Co…
The magnetic properties of Nd17Fe76.5B5Cu1.5-type sintered magnets, produced using a combination of hydrogen decrepitation and milling, have been investigated. An isothermal anneal or a step anneal, both performed after homogenization, resulted in a marked improvement of magnetic properties of the sintered magnets. Th…
We have carried out neutron diffraction measurements on powder samples of Nd2Fe17Nx and Y2Fe17Nx at room temperature. The refinements of the neutron data indicate that the nitrogen atoms occupy the 9e interstices in the nitride Nd2Fe17Nx (Th2Zn17 type, R3̄m) or the 6h interstices in the nitride Y2Fe17Nx (Th2Ni17 type,…
Quasistatic and dynamic measurements of the magnetic field induced magnetoelectric polarization (MEH effect) have been performed in the weakly ferromagnetic/ferroelectric/ferroelastic phase of point group m′m2′ of Ni-Cl boracite between 1.8 and 9 K (=TC) and above. For the first time the quadratic MEH effect of Ni-Cl…
Thermal quenching mechanism of Yb intra-4f-shell luminescence were clarified by studying the temperature dependences of electrical and optical properties of Yb-doped InP samples. The quenching mechanism which depends on shallow donor concentration was found by comparing temperature dependences of Yb 4f-shell luminesce…
We present a set of angle-integrated inverse-photoemission data on ${\mathrm{Fe}}_{2}$${\mathrm{O}}_{3}$ taken in the ultraviolet region (12.1--24.2 eV) in the isochromat mode. The photon-energy dependence of the spectra gives direct insight into the orbital origin of the empty electron states in the oxide. The result…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical modulation of the electron work functionJiri. JanataCite this: Anal. Chem. 1991, 63, 22, 2546–2550Publication Date (Print):November 15, 1991Publication History Published online1 May 2002Published inissue 15 November 1991https://pubs.acs.org/doi/10.1021/ac00022a003ht…
A new stable compound in the Nd–Fe system has been identified as Nd5Fe17. The crystal structure belongs to the hexagonal space group P63/mcm, with a=2.0214(8) nm and c=1.2329(8) nm, and with 12 formula units per unit cell. This compound is a ferromagnet with Tc = 503 K and magnetization 162 emu/g at 4.2 K. Mössbauer s…
The effect of additives has been studied for the Sm2Fe17Nx compounds. Only Co addition increases the Curie temperature. The Ti, V, or Co additions increase the anisotropy field. The additions of these elements are favorable for the magnet fabrication. The magnet fabrication has been carried out by the Zn metal bonding…
The effects of nitrogen uptake on the structural and magnetic properties of RFe12−xTx alloys have been studied. Several interstitial nitrides with composition RFe12−xTxNy (R=Nd and Sm and T=Ti and V) were prepared by heat treating fine powders of RFe12−xTx alloys in N2 gas. Preliminary results show the following obser…
Indentation/crack length measurements were used to determine hardness and fracture toughness in twinned and detwinned single crystals of YBa2Cu3O6+δ (YBCO). Hardness was found to be isotropic and unaffected by twin boundaries or moisture; the average hardness value was 9.5 GPa. Fracture toughness (Kc) was determined t…
The charge distributions in chemically synthesized poly(2,2'-bithiophene) (PBT) complexes have been studied by x-ray photoelectron spectroscopy (XPS). XPS results suggest the presence of multiple chemical states for the ``dopants'' in perchlorate, iodide, and ${\mathrm{FeCl}}_{4}^{\mathrm{\ensuremath{-}}}$ complexes.…
A number of metal-bonded Sm2Fe17-N magnets have been fabricated. These magnets exhibit iHc = 5.1–17.0 kOe, Br = 6.4–8.4 kG, (BH)max=5.0–10.8 MGOe, Tc = 757 K, and ρ=6.2–6.7 g/cm3. Powder metallurgical techniques have been employed with a mixture of powdered Sm2Fe17-N and Zn, Sn, or In. Heat treatment is carried out in…
The effects of surface oxidation on the structural and magnetic properties of fine Fe particles prepared by the evaporation technique have been studied using transmission electron microscopy, x-ray photoelectron spectroscopy, superconducting quantum interference device magnetometry, and Mössbauer spectroscopy. By vary…