Electronic structure of NaNbO3–Mn single crystals
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The authors create a titrimetric method of determining niobium in the presence of tantalum. The proposed method permits the determination of niobium in various objects: niobium(V) oxide, technical niobium hydroxide, and columbite concentrate, at various ratios of niobium and tantalum. The data obtained are cited in tables and it can be seen that at the selected ratios of niobium and tantalum in the sample, niobium is virtually entirely determined. Tantalum(IV), vanadium(V), molybdenum(VI), and tungsten(VI) interfere with the determination of niobium.
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) accordingly. The low melting point of copper prevent s the us e of suc h atreatment in the case of niobium coated copper cavities (Nb/Cu). In orde r to overcom e thisproblem, niobium coated niobium cavities (Nb/Nb) have been produced with the ai m tostudy the evolution of the superconducting properties of the niobium film with increasingfiring temperatures. In preparation for such a study, a number of preliminary step s havebeen taken and are reported in the present note. They include:· the development of a firing procedure using titanium as solid state getter material,complemented with a Nb box to avoid Ti contamination of the Nb film,· its use on bulk niobium cavities and the study o f the resulting modificatio n of their RFsuperconducting properties,· the production of Nb/Nb cavities and the study of thei r RF superconductin g propertiesprior to firing,· studies performed on heat treated Nb/Nb samples, providing information on theevolution of the grain size with increasing firing temperature.The study uses single cell resonators, operated at 1.5 GHz in the fundamental TM
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Niobium carbide
Niobium oxide
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We have fabricated and tested a total of six single cell niobium cavities, made from single crystal, high purity niobium. Two of the three cavities of the TESLA shape (1300 MHz) were made from Heraeus niobium by extending a smaller single crystal by rolling and annealing steps; the third cavity was made by spinning from CBMM material. The three other cavities of the scaled Low Loss (LL) shape (two) and High Gradient (HG) shape (one) resonated at 2.3 GHz and were fabricated from as received single crystals, both from Heraeus and CBMM niobium. After appropriate surface treatments by buffered chemical polishing and electropolishing most cavities performed quite nicely and peak surface magnetic fields of ~ 160 mT or above corresponding to accelerating gradients between 38 MV/m and 45 MV/m were reached. This paper reports about the performance of these cavities.
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This chapter contains sections titled: Nb Facts about Niobium Discovery Native Peoples Hunting Minerals A Discovery in the Museum One Element or Two? A New Name Question The Element Niobium The Niobium and Vanadium Discoveries – Great Similarities Niobium and Tantalum Minerals Industrial Niobium Manufacture Separation of Niobium and Tantalum Manufacture of Niobium Metal and Ferroniobium Uses of Niobium Niobium in Life
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The formation of a blue niobium- molybdenum heteropolycomplex in the interaction of niobium with molybdenum(VI) and molybdenum(V) was studied. Complexes of different composition (Mo(VI):Mo(V) = 5:1, 7:1, and 11:1) are formed in the NbMo(VI)-Mo(V) system at niobium concentration of between 2 x 10/sup -6/ and 1 x 10/sup -5/-M. A photometric method was developed for determining niobium in heat-resistant alloys with the sensitivity of 0.01%. The mean error is 3%. (auth)
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