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Autoren: Kirsten Linnow
<br>zurück zu [[SalzWiki:Organische Salze |Organische Salze]]
{{Infobox_Salt
|Footnote            =
|photo                =  [[Image:Thecotrichite 19082010-9.jpg|300px]]
|mineralogical_Name  =Thecotrichite
|chemical_Name        =Tricalciumtriacetatchloriddinitrate heptahydrate
|Trivial_Name        =
|chemical_Formula      =Ca<sub>3</sub>(CH<sub>3</sub>COO)<sub>3</sub>Cl(NO<sub>3</sub>)<sub>2</sub>•7H<sub>2</sub>O
|Hydratforms          =
|Crystal_System      =
|Crystal_Structure    =
|Deliqueszenzhumidity =85% (20°C) <ref>http://iaq.dk/iap/iap1998/1998_04.htm&lt</ref>
|Solubility          =
|Density              =
|MolVolume            =
|Molweight            =
|Transparency        =
|Cleavage            =
|Crystal_Habit        =
|Twinning            =
|Refractive_Indices  =n<sub>x</sub> = 1.491 ± 0.001<br>n<sub>z</sub> = 1.494 ± 0.003
|Birefringence        =
|optical_Orientation  =
|Pleochroism          =
|Dispersion          =
|Phase_Transition    =
|chemBehavior        =
|Comments            =found on calcareous museum objects<!--<nowiki>*</nowiki> <bib id=Halsberghe.etal:/><br>-->
}}
<!-- == Abstract  == -->
<br clear=all>
== '''Phase diagram of the quaternary system Ca(CH'''<sub>'''3'''</sub>'''COO)'''<sub>'''2'''</sub>'''–CaCl'''<sub>'''2'''</sub>'''–Ca(NO'''<sub>'''3'''</sub>''')'''<sub>'''2'''</sub>'''–H'''<sub>'''2'''</sub>'''O''' ==
[[Datei:Phasendiagramm_Thecotrichit_25GradC.jpg|thumb|400px|The number of the stability fields refer to a salt phase, which is in equilibrium with the saturated solutions of a stability field, as follows:<br/>
(1)&nbsp;CaCl<sub>2</sub>&nbsp;•&nbsp;6H<sub>2</sub>O, (2)&nbsp;CaCl<sub>2</sub>&nbsp;•&nbsp;4H<sub>2</sub>O, (3)&nbsp;CaCl(NO<sub>3</sub>)&nbsp;•&nbsp;2H<sub>2</sub>O, (4)&nbsp;Ca(NO<sub>3</sub>)<sub>2</sub>&nbsp;•&nbsp;3H<sub>2</sub>O, (5)&nbsp;Ca(NO<sub>3</sub>)<sub>2</sub>&nbsp;•&nbsp;4H<sub>2</sub>O, (6)&nbsp;Ca<sub>2</sub>(CH<sub>3</sub>COO)<sub>3</sub>(NO<sub>3</sub>)&nbsp;•&nbsp;2H<sub>2</sub>O, (7)&nbsp;Ca(CH<sub>3</sub>COO)<sub>2</sub>&nbsp;•&nbsp;H<sub>2</sub>O, (8)&nbsp;Ca(CH<sub>3</sub>COO)Cl&nbsp;•&nbsp;5H<sub>2</sub>O,  (9)&nbsp;Ca<sub>3</sub>(CH<sub>3</sub>COO)<sub>3</sub>Cl(NO<sub>3</sub>)<sub>2</sub>&nbsp;•&nbsp;7H<sub>2</sub>O.<br/>
Point T in the phase diagram represents the composition of the triple salt thecotrichite
(Ca<sub>3</sub>(CH<sub>3</sub>COO)<sub>3</sub>Cl(NO<sub>3</sub>)<sub>2</sub>&nbsp;•&nbsp;7H<sub>2</sub>O).]]
The isothermal phase diagram of the quaternary system Ca(CH<sub>3</sub>COO)<sub>2</sub>–CaCl<sub>2</sub>–Ca(NO<sub>3</sub>)<sub>2</sub>–H<sub>2</sub>O (25°C)<bib id="Linnow:2007"/> is shown as Jännecke projection on the anhydrous level. All solution compositions are given as '''molar ratio???''' of Ca(CH<sub>3</sub>COO)<sub>2</sub>, CaCl<sub>2 </sub>and Ca(NO<sub>3</sub>)<sub>2</sub>.
The corners of the triangle represent the three pure salts, the sides represent the three ternary systems Ca(CH<sub>3</sub>COO)<sub>2</sub>–CaCl<sub>2</sub>–H<sub>2</sub>O, Ca(CH<sub>3</sub>COO)<sub>2</sub>–Ca(NO<sub>3</sub>)<sub>2</sub>–H<sub>2</sub>O und CaCl<sub>2</sub>–Ca(NO<sub>3</sub>)<sub>2</sub>–H<sub>2</sub> 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.
<!--
== Vorkommen von Thecotrichite<br>  ==
<br>
== <br> Angaben zu Herkunft und Bildung von Thecotrichite an Objekten<br>  ==
= Angaben zum Schadenspotential und zur Verwitterungsaktivitätvon Thecotrichite<br>  =
== Lösungsverhalten  ==
== Hygroskopizität  ==
<br>
== Kristallisationsdruck  ==
== Umwandlungsreaktionen<br>  ==
= Analytischer Nachweis  =
== Mikroskopie<br>  ==
'''Laboruntersuchung:'''
'''Brechungsindizes:'''&nbsp; <br>'''Doppelbrechung''':&nbsp;&nbsp;&nbsp; Δ&nbsp; =<br>'''Kristallklass'''e:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>
<br> '''Polarisationsmikroskopische Untersuchung:'''<br> <br> <br>'''Verwechslungsmöglichkeiten:'''<br> <br>
{| width="100%" cellspacing="0" cellpadding="4" border="2"
|-
| '''Salzphase'''
| <font color="#818181">'''Unterscheidungsmerkmale zu Thecotrichite'''</font>
|-
| <br>
| <br>
|-
| <sub></sub> <br>
| <br>
|}
== Röntgendiffraktometrie  ==
== Raman-Spektroskopie  ==
== DTA / TG  ==
== IR-Spektroskopie  ==
= Umgang mit Thecotrichiteschäden  =
= Salze und Salzschäden im Bild  =
== Am Objekt  ==
== Unter dem Polarisationsmikrokop  ==
== Unter dem Rasterelektronenmikroskop  ==-->
== Weblinks<br>  ==
<references/>
== Literatur  ==
<biblist/>
[[Category:Thecotrichite]] [[Category:Acetate]][[Category:Linnow,Kirsten]] [[Category:R-MSteiger]] [[Category:Bearbeitung]] [[Category:Organ. Salze]] [[Category:Salz]]
[[User:SLeithaeuser|SLeithaeuser]] 10:02, 27 June 2012 (CEST)
[[User:SLeithaeuser|SLeithaeuser]] 10:02, 27 June 2012 (CEST)

Latest revision as of 15:43, 27 June 2012

SLeithaeuser 10:02, 27 June 2012 (CEST)

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