This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...changes for the crystals and y, and these may consequently be compounds. The other authors studied electrolytic reactivity in neutral saline solutions, obtaining hydrates or basic salts which were mechanically removed from the anodes. From their curve it appears that at about 40 per cent, the quantity of copper ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 Excerpt: ...changes for the crystals and y, and these may consequently be compounds. The other authors studied electrolytic reactivity in neutral saline solutions, obtaining hydrates or basic salts which were mechanically removed from the anodes. From their curve it appears that at about 40 per cent, the quantity of copper oxidised is reduced almost to nothing, which is another proof of the existence of the compound Cu2Zn3. Summarising the evidence it may be said that the com-. pound Cu2Zn3 certainly exists and can melt without decomposition. A compound CuSn also probably exists which is strongly dissociated at high temperatures and to a marked degree at lower temperatures, giving rise to copper and the compound CuaZn3, accompanied by the formation of mixed crystals with the components. Copper-calcium.--Copper is said to combine with calcium, forming the compounds Cu4Ca and CuCa4. The existence 1 Zeit. anorg. Chem., 56, 28 (1907). 2 Ber., 38, 2186 (1905). 3 Ibid., 38, 2190 (1905). J. Phys. Chem., 11, 501 (1907). of the latter compound is somewhat doubtful, as N. Baar1 has shown in his study of the system. The diagram is given in Fig. 71. From the eutectic point the curve rises up to 13-7 per cent, by weight of calcium, a maximum corresponding to the compound Cu4Ca, which melts at 933. From this point to the next, eutectic crystals of Cu4Ca separate. From melts containing more than 38 per cent, of calcium, a series of mixed crystals separate whose last member contains Fig. 71. 56 per cent, On the cooling curve of alloys between 23-5 and 90 per cent, calcium, points of arrest are noted at 480 with a maximum for 70 per cent, of the metal. This alloy, which may be a mixed crystal or the compound CuCa4, has a homogeneous appearance and passes without change of composition f...
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