Papers from the Geophysical Laboratory, Carnegie Institution of Washington Volume 252-290

Papers from the Geophysical Laboratory, Carnegie Institution of Washington Volume 252-290

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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. 1918 edition. Excerpt: ...binary system has been drawn on this basis; it is the broken curve in Fig. 6. The eutectic KjSiOa-KjSijOs is at about 7750 and a SiOj/KgO ratio of 1.30, the KiSiaOg-SiO eutectic at 525 1 Niggli (this Journal, 35, 1710 (i9i3))'gives 1015 io for the melting point of K, Si,0. and a SiO/K0 ratio of 4.0. The broken curve representing the equilibrium of melts containing small amounts of KjSijOj with SiO in one of its forms as solid phase is wholly an extrapolation. Its end points at the KSi08-a-quartz eutectic, and the melting temperature of pure silica are known, however, and the true curve cannot deviate much from its assumed course. It also must show breaks corresponding to the change K2Si03 1.25 15 2.0 3.0 4.0 6.0. Stf2 RATIO S.02/K20 Fig. 6. Diagram showing the variation of melting point with SiOj/KiO ratio on the one atmosphere isobar (cf. Pig. 4). from -quartz to /3-quartz at 575, and from /3-quartz to tridymite at 8700; the inversion tridymite-cristobalite at 14700 has also been considered, though this point does not lie inside the diagram as given. C. The Binary Systems H,0-K iO, EUO-KjSijOs, KjSiCVSiO, and HjO-SiOj.--The ternary system HjO-KjSiOr-SiO is limited by the binary systems KjSiO, -SiO, H20-Si02, and HjO-KjSiOj. The first of these has already been discussed; its components are suffitientlynon and is practically vertical. A second is the "dissociation pressure curve" of the higher hydrate. The course of these two curves is well known. The two remaining curves represent the vapor pressures of the solutions in equilibrium with solid and vapor. The general shape of these curves has been treated theoretically by van der Waals and demonstrated experimentally by Roozeboom.1 When the...show more

Product details

  • Paperback | 158 pages
  • 189 x 246 x 9mm | 295g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236794753
  • 9781236794758