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Copper is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; a freshly exposed surface has a reddish-orange color. Copper metal is used as a conductor of heat and electricity, a building material, and a constituent of various metal alloys.

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Jul 22, 2018· Testing a new vacuum and machine processing system. Basically the same formula as the other copper chromite firings, but this one lacked aluminum and lampblack. To learn more, visit https ...

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Problem with BDO->GBL using copper chromite I put 90.1g 1,4-butanediol, 4g of copper chromite catalyst and 0.15g of powdered sodium hydroxide in a 500ml flask and set up for refluxing. I heated to 200C slowly and expected some lively evolution of hydrogen, but nothing evolved.

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@article{osti_20005955, title = {Syntheses and studies on some copper chromite spinel oxide composites}, author = {Roy, S. and Ghose, J.}, abstractNote = {Composites of CuCr{sub 2}O{sub 4} semiconductor with the polymer poly-aryl-ether-ether-ketone were prepared. Characterization of the composite materials by X-ray diffraction (XRD), scanning electron microscopy (SEM) and infrared (IR ...

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Electrical conductivity, thermoelectrical properties, and ...

The results of a study of copper chromite ceramic samples doped with magnesium are presented. The samples were synthesized according to the solid-phase method using a special procedure for preparing the initial mixture, which ensures a uniform distribution of magnesium with its content from 0.2 to 6%. The substitution of chromium for magnesium in the crystal lattice is confirmed by Raman ...

An X-Ray Diffraction Study of the Copper Chromites and of ...

Abstract: Nano sized copper chromite, which is used as a burn rate accelerator for solid propellants, was synthesized by the solution combustion process using citric acid and glycine as fuel. Pure spinel phase copper chromite (CuCr 2 O 4) was synthesized, and the ...

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Preparation of Copper Chromite - Erowid

Preparation of high-active copper chromite dehydrogenation catalyst. A solution of 260 g of Copper(II)nitrate trihydrate in 900 ccm of tap water at 80°C was added while stirring to a soln 178 g of sodium dichromate dihydrate and 225 ml of 28% NH4OH made up to 900 ml at 25°C.

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Chromium - Wikipedia

Chromium is a member of group 6, of the transition metals. Chromium(0) has an electron configuration of [Ar]3d 5 4s 1, owing to the lower energy of the high spin configuration. Chromium exhibits a wide range of oxidation states, but chromium being ionized into a cation with a positive 3 charge serves as chromium's most stable ionic state.

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Electrical transport in copper chromite catalyst ...

The electrical conductivity, σ, and thermoelectric power, S, of copper chromite (CuCr 2 O 4) are reported in the temperature range 295 to 815 K.A break (T B) in the slope of the plot of log σ against T −1 was observed around 556 K. Apart from this break, the curves are linear, and their slopes correspond to activation energies of 0.60 eV (T B <556 K) and 1.22 eV (T B >556 K).

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