Bulletin Volume 18-25

Bulletin Volume 18-25

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1921 edition. Excerpt: ...Bismuth curves in Fig. 38 have been plotted there are observations by Pecheux 125 on the thermoelectromotive forces of some members of this series. According to the interpretation of Broniewski, two compounds are indicated by his curves: viz., AlMg and Al2Mg3. Of these-compounds Al2Mgs is much more clearly marked than the compound AlMg. Broniewski: Ann. de Phys. et Chem. (8), 25, 76, 1912. 121 Pecheux: C. R., 139, 1202, 1904. Copper-Arsenic. The freezing point curve of Fig. 39 is by Friedrich.126 From the equilibrium diagram and from a metallographic study of these, alloys it is found that copper and arsenic form two compounds Cu3As and Cu3As2 and that arsenic dissolves in copper up to 4 per cent. Fig. 38. 10 20 30 40 50 60 10 80 90 100 Weight Per Cent. Magnesium Some observations on the electrical conductivity of copperarsenic alloys have been made by Matthiessen and Holtzmann 127 and later by Hampe.128 Friedrich also gives some data on the electrical resistance of these alloys for low concentrations of arsenic. The specific resistance of these alloys and the tempera Friedrich: Metallurgie, 5, 529, 1908. "'Matthiessen and Holtzmann: Pogg. Ann., no, 229, 186c. Hampe: Chemiker, Ztg., 726, 1892. ture coefficient (Fig. 39) are the values given by Puschin and Dischler.129 The electrical resistance of copper is much increased by the addition of small quantities of arsenic, and the temperature coefficient is decreased. This occurs in the region where a solid solution of arsenic in copper is formed and is characteristic of the formation of such solutions. When the concentration of arsenic is about 28.5 per cent, the specific resistance has its maximum Fig. 39. Copper Cuj As Arsenic Co to "0 5 10 15 10 15 30 35 10 50 Weiqht Per...
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Product details

  • Paperback
  • 189 x 246 x 9mm | 308g
  • United States
  • English
  • black & white illustrations
  • 1236880501
  • 9781236880505