Talk:Thecotrichite
Autoren: Kirsten Linnow
zurück zu Organische Salze
| Thecotrichite | |
| |
| Mineralogical name | {{{mineralogical_Name}}} |
| Chemical name | Tricalcium triacetate chloride dinitrate heptahydrate |
| Trivial name | |
| Chemical formula | Ca3(CH3COO)3Cl(NO3)2•7H2O |
| Other forms | {{{Hydratforms}}} |
| Crystal system | |
| Crystal structure | |
| Deliquescence humidity 20°C | {{{Deliqueszenzhumidity}}} |
| Solubility (g/l) at 20°C | |
| Density (g/cm³) | |
| Molar volume | {{{MolVolume}}} |
| Molar weight | {{{Molweight}}} |
| Transparency | |
| Cleavage | |
| Crystal habit | |
| Twinning | |
| Phase transition | |
| Chemical behavior | |
| Comments | found on calcareous museum objects |
| Crystal Optics | |
| Refractive Indices | nx = 1.491 ± 0.001 nz = 1.494 ± 0.003 |
| Birefringence | |
| Optical Orientation | |
| Pleochroism | |
| Dispersion | |
| Used Literature | |
| {{{Literature}}} | |
Phase diagram of the quaternary system Ca(CH3COO)2–CaCl2–Ca(NO3)2–H2O[edit]
(1) CaCl2 • 6H2O, (2) CaCl2 • 4H2O, (3) CaCl(NO3) • 2H2O, (4) Ca(NO3)2 • 3H2O, (5) Ca(NO3)2 • 4H2O, (6) Ca2(CH3COO)3(NO3) • 2H2O, (7) Ca(CH3COO)2 • H2O, (8) Ca(CH3COO)Cl • 5H2O, (9) Ca3(CH3COO)3Cl(NO3)2 • 7H2O.
Point T in the phase diagram represents the composition of the triple salt thecotrichite (Ca3(CH3COO)3Cl(NO3)2 • 7H2O).
The isothermal phase diagram of the quaternary system Ca(CH3COO)2–CaCl2–Ca(NO3)2–H2O (25°C) [Linnow:2007]Title: Salt damage in porous materials: An RH XRD investigation
Author: Linnow, Kirsten
is shown as Jännecke projection on the anhydrous level. All solution compositions are given as molar ratio??? of Ca(CH3COO)2, CaCl2 and Ca(NO3)2.
The corners of the triangle represent the three pure salts, the sides represent the three ternary systems Ca(CH3COO)2–CaCl2–H2O, Ca(CH3COO)2–Ca(NO3)2–H2O und CaCl2–Ca(NO3)2–H2 and the inner surface represents all solution compositions where the three salts are involved.
The inner lines delimit the stability fields of a salt phase. The stability fields represent all solution compositions, which are saturated with respect to only a single salt phase. The univariant lines represent the solution compositions where two salt phases are in equilibrium with the solution.
According to Gibbs’ phase rule in the quaternary system a maximum of three different salt phases coexist in a solution equilibrium. It follows that for each possible combination of three salt phases in the form of precipitate, only one possible composition of a saturated solution is possible. These solution combinations are represented by intersections of the univariant lines.
Weblinks
[edit]
Literature[edit]
There were no citations found in the article. SLeithaeuser 10:02, 27 June 2012 (CEST)