Polyhedral clathrate hydrates of a strong base: Phase relations and crystal structures in the system tetramethylammonium hydroxide-water

1990 ◽  
Vol 8 (1-2) ◽  
pp. 139-157 ◽  
Author(s):  
Dietrich Mootz ◽  
Reinhard Seidel
Keyword(s):  
Crystal Structures ◽  
Phase Relations ◽  
Tetramethylammonium Hydroxide ◽  
Clathrate Hydrates ◽  
Strong Base ◽  
Hydroxide Water ◽  
Base Phase

Phase Relations and Crystal Structures in the Ternary Systems Sr-{Ag, Au}-{Si, Ge}

2015 ◽  
Vol 641 (8-9) ◽  
pp. 1404-1421 ◽  
Author(s):  
Isolde Zeiringer ◽  
Andriy Grytsiv ◽  
Ernst Bauer ◽  
Gerald Giester ◽  
Peter Rogl
Keyword(s):  
Crystal Structures ◽  
Ternary Systems ◽  
Phase Relations

Solubility in the potassium stannate – potassium hydroxide – water system at 0 to 95.0 °C

1968 ◽  
Vol 46 (16) ◽  
pp. 2715-2719 ◽  
Author(s):  
P. Rosenblum
Keyword(s):  
Potassium Hydroxide ◽  
Invariant Point ◽  
Water System ◽  
Phase Relations ◽  
Polarizing Microscope ◽  
Solid Phases ◽  
Hydroxide Water

Solubilities and phase relations have been determined in the K2Sn(OH)6–KOH–H2O system between 0 and 95.0 °C. The isotherms consist of only one major solubility branch, that of K2Sn(OH)6, while the solubility branch of KOH is indistinguishable, since the isothermal invariant point is extremely close to the solubility of potassium hydroxide. Solid phases have been determined by Schreinemakers' method and checked with the polarizing microscope.

Clathrathydrate von Tetramethylammoniumhydroxid: Neue Phasen und Kristallstrukturen [1] / Clathrate Hydrates of Tetramethylammonium Hydroxide: New Phases and Crystal Structures [1]

1992 ◽  
Vol 47 (2) ◽  
pp. 263-274 ◽  
Author(s):  
Dietrich Mootz ◽  
Dieter Stäben
Keyword(s):  
Unit Cell ◽  
Tetramethylammonium Hydroxide ◽  
Clathrate Hydrates ◽  
Space Group ◽  
Β Phase ◽  
Metastable Structure ◽  
Cell Dimensions ◽  
Structure Determinations ◽  
Butyl Amine ◽  
Unit Cell Dimensions

The melting diagram of the system tetramethylammonium hydroxide-water has been reinvestigated in the region of 66.67 - 100 mol% H2O , using DTA , DSC and temperature-dependent X-ray powder diffraction. This was done as correction and supplementation of a previous study in the same laboratory (D. Mootz, R. Seidel, J. Incl. Phenom. 8 , 139 (1990)). The system is now considered to contain as many as eight stable hydrates, three of them dimorphic with a low-temperature α and a high-temperature β form. The compositions are Me4NOH · χH2O with χ = 2 (α and β), 4, 4.6 (α and β), 5 (α and β), 6.67, 7.5, 8.75 and 10. A second 7.5-hydrate, called 7 .5 α in the previous study, is now regarded as metastable. - Structure determinations have been performed for the new phases with x = 4.6 (α), 6.67 and 8.75. The 4.6 α-hydrate, transforming to 4.6 β at 32 °C, is cubic with space group Pa3̄ and Z = 40 formula units per unit cell. The lattice constant is a = 21.493 Å at -160 °C. The 6.67-hydrate, melting with decomposition at 13 °C, is monoclinic with space group P21/m and Z = 6 . It was studied as the O-deuterated isotype with unit-cell dimensions a = 11.874, b = 20.019, c = 8.272 Å and β = 103.84° at 3 °C. The 8.75-hydrate, melting with decomposition at - 3 °C, is cubic with space group 14̄3 d, Z = 16 and a = 18.38(2) Å at - 20 °C. The three structures, as most others of the higher hydrates of the system studied previously, are those of polyhedral clathrate hydrates. For the hydrates 4 .6 α and 6.67 deviations of the anionic, i.e. proton-deficient, new water structures from being fully four-connected are described in detail. The 8.75-hydrate is isostructural with the hitherto unparalleled 9.75-hydrate of t-butyl amine. - The phase identity and structure of the 4.6 β-hydrate were recognized as those attributed to an erroneously assumed 5 β-phase in the previous study. 5 β now denotes the room-temperature form of the pentahydrate, previously called 5 α. The present 5 α is another of the new phases and the only one of the system with its structure still undetermined.

ChemInform Abstract: Phase Relations in the System NaIn-Sn and the Crystal Structures of the Intermediate Compounds NaInSn2 and NaInSn4.

ChemInform ◽  
1989 ◽  
Vol 20 (33) ◽  
Author(s):  
W. BLASE ◽  
G. CORDIER ◽  
R. KNIEP ◽  
R. SCHMIDT
Keyword(s):  
Crystal Structures ◽  
Phase Relations

Josephinite: Crystal structures and phase relations of the metals

1980 ◽  
Vol 23 (4) ◽  
pp. 255-261 ◽  
Author(s):  
William A. Bassett ◽  
John M. Bird ◽  
Maura S. Weathers ◽  
D.L. Kohlstedt
Keyword(s):  
Crystal Structures ◽  
Phase Relations

scholarly journals BaAl4 derivative phases in the sections {La,Ce}Ni2Si2–{La,Ce}Zn2Si2: phase relations, crystal structures and physical properties

2016 ◽  
Vol 45 (12) ◽  
pp. 5262-5273 ◽  
Author(s):  
Fainan Failamani ◽  
Zahida Malik ◽  
Leonid Salamakha ◽  
Friedrich Kneidinger ◽  
Andriy Grytsiv ◽  
...  
Keyword(s):  
Physical Properties ◽  
Crystal Structures ◽  
Phase Relations

Phase relations, crystal structures and physical properties of the BaAl4 derivative phases within the sections LaNi2Si2–LaZn2Si2 and CeNi2Si2–CeZn2Si2 at 800 °C have been evaluated.

ChemInform Abstract: Phase Relations in the Na2MoO4-Cs2MoO4and Na2MoO4-Cs2MoO4-ZnMoO4Systems, Crystal Structures of Cs3Na(MoO4)2and Cs3NaZn2(MoO4)4.

ChemInform ◽  
2016 ◽  
Vol 47 (12) ◽  
pp. no-no
Author(s):  
Evgeniya S. Zolotova ◽  
Zoya A. Solodovnikova ◽  
Vasiliy N. Yudin ◽  
Sergey F. Solodovnikov ◽  
Elena G. Khaikina ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Phase Relations

scholarly journals The system Ce–Zn–Si for <33.3 at.% Ce: phase relations, crystal structures and physical properties

RSC Advances ◽  
2015 ◽  
Vol 5 (46) ◽  
pp. 36480-36497 ◽  
Author(s):  
Fainan Failamani ◽  
Andriy Grytsiv ◽  
Raimund Podloucky ◽  
Herwig Michor ◽  
Ernst Bauer ◽  
...  
Keyword(s):  
Physical Properties ◽  
Crystal Structures ◽  
Phase Formation ◽  
Phase Relations

The phase relations, mechanism of phase formation, crystal structures, physical properties of novel compounds in the Ce–Zn–Si system were investigated.

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