7699-43-6Relevant articles and documents
Possibility of integrated processing of the baddeleyite concentrate
Lebedev,Lokshin,Mel'nik,Shchur,Popova
, p. 708 - 710 (2004)
Main procedures used in integrated processing of baddeleyite, including sintering with calcium carbonate or oxide, decomposition of the cake with hydrochloric acid, and recovery of zirconium in the form of zirconium oxochloride, were studied.
Relaxation of electronic defects in pure and doped La2O3 observed by perturbed angular correlations
Lupascu, Doru,Habenicht, Soenke,Lieb, Klaus-Peter,Neubauer, Matthias,Uhrmacher, Michael,Wenzel, Thorsten
, p. 871 - 883 (1996)
Slow recovery processes of the electronic environment following the electron-capture decay of 111In can reduce the amplitude of the perturbed γγ-angular correlation of a nuclear decay. This effect was used to quantitatively extract recovery rates of an electrically stable environment at the probe ion 111Cd in La2O3. The recovery rates depend on the availability of electrons at the probe site, which in turn is governed by the concentration of electron sources and the transport mechanisms. Both properties are experimentally analyzed by variations of the temperature and oxygen partial pressure and by doping with two (Ba, Mg) and four-valent ions (Ce, Zr). Tunneling processes between defect levels in the band gap are proposed to account for the temperature dependence of the recovery rates. Unexpectedly, an enhanced electron availability is observed at temperatures below 200 K. The electric field gradients of substitutional 111Cd and those generated by intrinsic defects and dopants are analyzed. A comparison to the probe ion 111mCd, not affected by electron capture, is presented.
Synthesis, characterization and biological study on Cr3+, ZrO2+, HfO2+ and UO22+ complexes of oxalohydrazide and bis(3-hydroxyimino)butan-2-ylidene)-oxalohydrazide
El-Asmy,El-Gammal,Radwan
, p. 496 - 501 (2010/08/07)
Cr3+, ZrO2+, HfO2+ and UO22+ complexes of oxalohydrazide (H2L1) and oxalyl bis(diacetylmonoxime hydrazone) [its IUPAC name is oxalyl bis(3-hydroxyimino)butan-2-ylidene)oxalohydrazide] (H4L2) have been synthesized and characterized by partial elemental analysis, spectral (IR; electronic), thermal and magnetic measurements. [Cr(L1)(H2O)3(Cl)]·H2O, [ZrO(HL1)2]·C2H5OH, [UO2(L1)(H2O)2] [ZrO(H3L2)(Cl)]2·2H2O, [HfO(H3L2)(Cl)]2·2H2O and [UO2(H2L2)]·2H2O have been suggested. H2L1 behaves as a monobasic or dibasic bidentate ligand while H4L2 acts as a tetrabasic octadentate with the two metal centers. The molecular modeling of the two ligands have been drawn and their molecular parameters were calculated. Examination of the DNA degradation of H2L1 and H4L2 as well as their complexes revealed that direct contact of [ZrO(H3L2)(Cl)]2·2H2O or [HfO(H3L2)(Cl)]2·2H2O degrading the DNA of Eukaryotic subject. The ligands and their metal complexes were tested against Gram's positive Bacillus thuringiensis (BT) and Gram's negative (Escherichia coli) bacteria. All compounds have small inhibitory effects.