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Intermetallic Phases (intermetallic + phase)
Selected AbstractsChemInform Abstract: anti-Mackay Polyicosahedral Clusters in La,Ni,Mg Ternary Compounds: Synthesis and Crystal Structure of the La43Ni17Mg5 New Intermetallic Phase.CHEMINFORM, Issue 21 2010Pavlo Solokha Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Europium Substitution into Intermetallic Phases Grown in Ca/Zn Flux.CHEMINFORM, Issue 45 2009Milorad Stojanovic Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Ba5Al2Ge7 and Ba7Al4Ge9: Two New Intermetallic Phases with Unusual Al,Ge Anions.CHEMINFORM, Issue 40 2007Marco Wendorff Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF. [source] Stabilization of New Forms of the Intermetallic Phases ,-LnNiGe2 (Ln: Dy, Ho, Er, Tm, Yb, Lu) in Liquid Indium.CHEMINFORM, Issue 18 2004J. R. Salvador Abstract For Abstract see ChemInform Abstract in Full Text. [source] ChemInform Abstract: Chemical Vapor Transport of Intermetallic Phases.CHEMINFORM, Issue 35 2001Part 4. Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] ChemInform Abstract: Crystallographic, Magnetic and Magnetocaloric Properties of GdMgX Intermetallic Phases (X: Al, Ga, In).CHEMINFORM, Issue 15 2001F. Canepa Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Organometallic Access to Intermetallic , -CuE2 (E = Al, Ga) and Cu1,xAlx PhasesEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 21 2008Mirza Cokoja Abstract In this work, we compare different precursor approaches for the mild decomposition to copper,aluminum and ,gallium powder materials in nonaqueous solution. Referring to previous work on the preparation of Cu,Al alloy materials from [(AlCp*)4] and [CpCu(PMe3)], the amine-stabilized metal trihydrides [(Me3N)AlH3] and [(quinuclidine)GaH3] were used as alternative sources for Al and Ga. In a comparative study, [(Me3N)AlH3] and [(AlCp*)4] were treated with the Cu precursors [CpCu(PMe3)] and [{Cu(mesityl)}5] in mesitylene solution in various molar ratios at 150 °C and 3 bar H2 to give metallic precipitates of the composition Cu1,xAlx (x = 0.67, 0.50, 0.31). Whereas the combination [(AlCp*)4] with [{Cu(mesityl)}5] did not yield an intermetallic phase, all other Cu/Al precursor combinations led to alloyed Cu,Al materials. For x = 0.67, the ,-CuAl2 phase formed, as shown by X-ray powder diffraction (XRD) and solid-state magic-angle-spinning (MAS)NMR spectroscopic studies. Similarly, the reaction of [{Cu(mesityl)}5] with [(quinuclidine)GaH3] immediately led to the precipitation of a gray powder, without the addition of hydrogen. The powder was identified by means of XRD as ,-CuGa2. At x = 0.50 and below, the reactions were less phase selective depending on the precursor combination. [CpCu(PMe3)] combined with both Al precursors afforded a mixture of several Cu,Al phases, whereas [{Cu(mesityl)}5] was treated with [(Me3N)AlH3] to yield a material whose X-ray signature was assigned to the monoclinic Cu0.51Al0.49 phase. The ,-Cu9Al4 phase could not be obtained from [CpCu(PMe3)]; instead, solid solutions of ,-Cu were obtained. The treatment of [{Cu(mesityl)}5] with [(Me3N)AlH3] in the Cu/Al molar ratio of 9:4 (x = 0.31) gave a gray powder, which could be identified by XRD as ,-Cu9Al4.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008) [source] Behavior of Silver and Palladium Mixtures during HeatingJOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 11 2000Terry Garino The behavior of mixtures of silver and palladium during heating in both air and an inert atmosphere was studied using X-ray diffractometry (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), dilatometry, and scanning electron microscopy (SEM). In situ high-temperature XRD studies on a commercial 20% palladium material with submicrometer-sized particles indicated that an intermetallic phase, most likely Ag3Pd, formed in air between 300° and 400°C, the same temperature range where a 13% linear expansion was measured by dilatometry. The DSC data indicated an exothermic peak at 340°C, a temperature where the TGA results indicated that the material had picked up only 0.2% oxygen, compared with the maximum of 1.4% at 525°C. No PdO was detected by XRD at 400°C, which suggests that oxygen was being incorporated in the intermetallic. Microstructural examination using SEM indicated that larger particles, with internal pores, had formed after heating in air to 375°C. When the material was heated in argon for 1 h at 400°C, no intermetallic phase or alloy formed, and minimal expansion occurred. When mixtures of larger silver particles (5,30 ,m) with palladium particles (1,3 ,m) were heated in air, the maximum amount of expansion that occurred increased from 0% for pure palladium up to a maximum of 18% at 75% silver. This result supports the conclusion that expansion is a result of formation of this new phase, in the presence of oxygen, not of the oxidation of the palladium. [source] IR-VIS-UV ellipsometry, XRD and AES investigation of In/Cu and In/Pd thin filmsPHYSICA STATUS SOLIDI (C) - CURRENT TOPICS IN SOLID STATE PHYSICS, Issue 5 2008A. A. Wronkowska Abstract Optical and compositional properties of In, In/Pd and Pd/In/Pd thin films evaporated on Cu and SiO2 substrates in vacuum were investigated by means of X-ray diffractometry, Auger electron spectroscopy and spectroscopic ellipsometry methods. Auger depth profile studies were performed in order to determine the composition of InCu and InPd structures. In both systems interdiffusion of metals was detected at room temperature. The XRD patterns indicated formation of CuIn2 and PdIn3 phases in the samples. Optical properties of the composite layers containing intermetallic phases were derived from ellipsometric quantities , and , measured in the photon energy range 0.1-6.0 eV at different angles of incidence using suitable multilayer models for the examined samples. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source] Large, larger, largest , a family of cluster-based tantalum copper aluminides with giant unit cells.ACTA CRYSTALLOGRAPHICA SECTION B, Issue 3 2009This is the first of two parts, where we report the structure determination of a novel family of cluster-based intermetallic phases of unprecedented complexity: cF444-Al63.6Ta36.4 (AT-19), a = 19.1663,(1),Å, V = 7040,Å3, cF(5928,,,x)-Al56.6Cu3.9Ta39.5, x = 20 (ACT-45), a = 45.376,(1),Å, V = 93,428,Å3 and cF(23,256,,,x)-Al55.4Cu5.4Ta39.1, x = 122 (ACT-71), a = 71.490,(4),Å, V = 365,372,Å3. The space group is in all three cases. These cluster-based structures are closely related to the class of Frank,Kasper phases. It is remarkable that all three structures show the same average structure that resembles the cubic Laves phase. [source] Large, larger, largest , a family of cluster-based tantalum copper aluminides with giant unit cells.ACTA CRYSTALLOGRAPHICA SECTION B, Issue 3 2009This is the second of two papers, where we discuss the cluster structures of a novel family of cluster-based intermetallic phases of unprecedented complexity: cF444-Al63.6Ta36.4 (AT-19), a = 19.1663,(1),Å, V = 7040,Å3, cF(5928,,,x)-Al56.6Cu3.9Ta39.5, x = 20 (ACT-45), a = 45.376,(1),Å, V = 93,428,Å3 and cF(23,,256,,,x)-Al55.4Cu5.4Ta39.1, x = 122 (ACT-71), a = 71.490,(4),Å, V = 365,372,Å3. The space group is in all three cases. The structures can be described as packings of clusters such as fullerenes, dodecahedra, pentagonal bifrusta and Friauf polyhedra. A characteristic feature of the two larger structures are nets of hexagonal bipyramidal Ta clusters (h.b.p.). The extremely short distance of 2.536,2.562,Å between their apical Ta atoms indicates unusually strong bonding. The large h.b.p. nets are sandwiched between slabs of Friauf polyhedra resembling the structure of the , phase. [source] | ||||||||||