We have improved the activation process for CuBTC [Cu3(BTC)2, BTC = 1,3,5-benzenetricarboxylate] by extracting N,N-dimethylformamide-solvated crystals with methanol; we identify material activated in this way as CuBTC−MeOH. This improvement allowed to be performed at a much lower temperature, thus greatly mitigating danger of reducing copper ions. A review literature H2 adsorption shows that preparation and has significant impact on capacity, surface area, pore volume. CuBTC−MeOH exhibits...

Results of magnetization measurements on carefully prepared single crystals Sm${\mathrm{Co}}_{5}$ are presented over the temperature range 4-970 K. The contribution rare-earth sublattice magnetocrystalline anisotropy was evaluated using data Y${\mathrm{Co}}_{5}$ as "a blank." These results interpreted basis a singleion model. following Hamiltonians were employed to obtain eigenvalues: $\mathcal{H}(\mathrm{parallel}\mathrm{to} c...

We have experimentally measured hydrogen isotherms at 77 and 298 K up to a pressure of 50 bar in recently developed metal−organic framework material, [Zn(bdc)(ted)0.5] (bdc = benzenedicarboxylate, ted triethylenediamine). This material has tetragonal structure relatively small pores. used atomically detailed simulations compute adsorption over the same temperature ranges studied experimentally. The agreement between experiments is very good. included quantum effects through Feynman−Hibbs...

We have used elastic neutron scattering to examine the effect of hydriding on sublattice magnetization Laves-phase compounds RFe2 for R=Ho and Er. On addition hydrogen or deuterium a stable phase composition about RFe2D3.5 is formed. The pure are ferrimagnetic, with R moment equal free ion value Fe ∼1.6 μB. bulk Curie temperatures Tc hydrides deuterides considerably lower than corresponding values (e.g., 440 K ErFe2D3.5 versus 574 ErFe2). 10 also significantly reduced in (4.4 5.2 μB 9 Er Ho...

Nickel zinc ferrites have been very widely used in the high-frequency applications. In our present study we prepared Ni1−x Znx Fe2O4 (0≤x≤1) using novel hydrazinium metal hydrazinecarboxylate precursors. High densities (∼99%) obtained for all sintered at relatively low temperatures, 1100 °C, comparison with conventional method (≥1200 °C). The variation of magnetic properties like moment, Curie temperature, and permeability concentration studied.

Ultrafine subdomain particles of NiFe2O4, Ni0.5Zn0.5Fe2O4, and CoFe2O4 were prepared under mild hydrothermal conditions by precipitating from metal nitrates. Magnetic Mössbauer effect measurements revealed the superparamagnetic nature these ferrite particles. The crystallite sizes in range 5.0–20.0 nm with a very narrow particle size distribution. magnetic properties hyperfine parameters are somewhat different those reported for multidomain bulk materials. powders found to sinter almost...

A number of metal-bonded Sm2Fe17-N magnets have been fabricated. These 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 employed with a mixture powdered Zn, Sn, or In. Heat treatment is carried out in the temperature range 160–450 °C N2 atmosphere at pressures ranging from 0–900 psi. The effects In contents heat conditions on magnetic properties studied. Zn as binder significantly enhances coercivity 1.8–2.5 kOe...

Rare earth elements (R) react with hydrogen at elevated temperatures to form hydrides compositions approaching RH3. Intermetallic compounds involving the rare earths in chemical union Mn, Fe, Co or Ni absorb copious quantities of rapidly and dissociatively room temperature. In all RH3 many hydrogenated intermetallics proton density exceeds that condensed elemental hydrogen. The presence such large amounts significantly modifies various physical properties host metal. hydrogenation produces a...

MnBi forms peritectically at ∼450 °C. Preparation of employing conventional techniques such as arc melting and induction results in the segregation manganese. In order to avoid this segregation, we followed procedure recommended by Guo et al. [X. Guo, A. Zaluska, Z. Altounian, J. O. Strom-Olsen, Mater. Res. 5, 2646 (1990)] prepared a low-temperature phase melt spinning, heat treatment. Fine powder was ball milling melt-spun ribbons for various lengths time. Magnetic properties these powders...

Using molecular beam epitaxy and ion implantation, Japanese workers have formed Fe16N2 in thin Fe films. They report a large magnetic induction for this nitride, ≥2.8 T. In the present study, has been prepared bulk form by treating powder with NH3/H2 gas mixtures at temperatures range 660–670 °C. The γ phase alloy, which forms under these conditions, was quenched to room temperature α′-Fe-N then heat treated 120–150 °C α″-Fe-N phase. α′ 80% purity, other being nonmagnetic γ-Fe-N. α″ 50%...

Adsorption−desorption cycles for CO2 and CH4 on the one-dimensional coordination polymer, catena-bis(dibenzoylmethanato)-(4,4′-bipyridyl)nickel(II), "Ni-DBM-BPY", showed pronounced step-shape isotherms, where minimal gas adsorption was detected below a threshold pressure rapid uptake observed above this threshold. Desorption isotherms from saturated state displayed significant hysteresis isotherm path. Such behavior is rare in polymers that lack robust framework with permanent porosity. This...

Nd15.4Fe77.8B6.8 magnets of various degrees crystal alignment have been prepared by the conventional powder metallurgy technique. The these determined x-ray diffraction and fitting standard deviation a Gaussian distribution for relative intensity versus angle between normals (hkl) tetragonal c axis. is good indicator alignment. An aligning field 8 kOe found to be essential obtain well-aligned NdFeB magnet. remanence sintered directly affected Furthermore, effect on follows theoretical...