Получение и свойства керамических материалов на основе системы Al[2]O[3]-MgO

It is known that aluminum oxide is the most generally used ceramic material applied as structural, functional and biomaterial. Meanwhile, it is used not only in a high state and but also in a highporous state. To obtain the required functional properties it is alloyed by various oxides such as FeO, SiO[2], Y[2]O[3], MgO and others. What most interested us is the magnasium oxide (MgO), as it is well known that the MgO presence in the ceramics materials causes biological processes activation at the boundary "implant - bone". However, the introduction of MgO into sintered mixture may change technological regimes of ceramics production and as a result to the structure and properties of the material can be changed as well. The aim of this work is to study the influence of the concentration of the injected mixture into the sintered MgO in the amount up to 10 wt. %. onto porosity, shrinkage characteristics of the microstructure and mechanical properties of the sintered material

Микромеханизмы деформации и разрушении слоистого материала из титанового сплава ВТ6 при ударном нагружении

The paper studies the phase composition, microstructure. and mechanisms of plastic deformation and fracture under shock loading in a layered material obtained by pressure welding of VT6 titanium alloy sheets. Under shock loading at 20 and 196 {5}C, the material is delaminated into sheet piles and this changes their fracture rate. At fracture surfaces, the initial crystal structure experiences structural phase decomposition resulting in dynamic rotations. In crystalline sublayers of the fracture surfaces and delamination, the material is fragmented. The effects are more pronounced at T =-196 °С

Azido­{2-[bis­(2-hy­droxy­eth­yl)amino]­ethano­lato-κ4 N,O,O′,O′′}cobalt(II)

In the title complex, [Co(C6H14NO3)(N3)] or [Co(teaH2)N3], the CoII atom resides in a trigonal–bipymidal O3N2 environment formed by three O atoms and one N atom from a simply deprotonated tetra­dentate triethano­lamine ligand, and one N atom from an azide ligand. The O atoms define the equatorial plane whereas both N atoms are in axial positions. The mononuclear units are linked through O—H⋯O hydrogen-bonding inter­actions between the ethanol OH groups and the ethano­late O atom of a neighbouring complex into chains running parallel to [010]

A [Ce21] Keplerate

The solvothermal reaction between Ce(NO3)3·6H2O, 2-amino-isobutyric acid, 2-hydroxy-1-naphthaldehyde and 2-amino-2-methyl-1,3-propanediol in MeOH, in the presence of base, leads to the formation of a unique [CeIV13Ce III8] keplerate cage

First examples of polynuclear lanthanide diethylene glycol based coordination clusters

Five lanthanide coordination clusters (CCs) [Ln7(μ3-OH)4(deg)2(Hdeg)2(ben)11]·xCH3CN [Ln=Eu (1), Gd (2), Tb (3), Dy (4), Ho (5); H2deg=diethylene glycol, Hben=benzoic acid, x=7 for 1-4 and 6 for 5] with diethylene glycol and benzoic acid as ligands have been prepared and structurally characterized. All CCs consist of a heptanuclear lanthanide core with a scarce tip-sharing double-butterfly topology. Magnetic measurements revealed that CC 4 exhibits slow magnetic relaxation with an energy barrier of about 6K, whereas CC 3 shows outstanding magnetocaloric effect with entropy change of 34.6 J Kg-1 K-1 at 2K and ΔH=7T. The photoluminescent properties of CCs 1, 3 and 4 were also investigated, displaying intense characteristic emission spectra of EuIII, TbIII and DyIII ions

Cerium oxide nanoclusters: Commensurate with concepts of polyoxometalate chemistry?,

The mixed-valent cerium(III/IV) oxide clusters {Ce(10)} and {Ce(22)}, derived from condensation reactions of cerium carboxylate coordination polymers, exhibit molecular growth tendencies similar to those of 'classical' group V and VI polyoxometalates, but with increasing nuclearity approach the structure of the parental oxide, CeO(2)

{Ce 10_{10} Mn 8_{8} }: Cerium Analogues of the Decavanadate Archetype

In the presence of structure-directing isobutyrate (ib) ligands, CeIII and MnII salts undergo a sequence of oxidation and condensation steps, which result in the intermittent formation of the neutral coordination cluster [Mn10O2(ib)18(Hib)2], followed by Mn-decorated {Ce10Mn8} clusters. Their common inorganic {CeIV10MnII2MnIII6O18} core features a cerium oxide substructure with a decavanadate-type metal framework, which showcases that molecular cerium oxide structures indeed can adopt certain structural principles of classical polyoxometalates. In addition, we identified the exact composition and structure of the precursor “manganese isobutyrate”, which actually consists of [Mn6(ib)12(Hib)6] macrocycles