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| Autoren: Kirsten Linnow
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| <br>zurück zu [[SalzWiki:Organische Salze |Organische Salze]]
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| {{Infobox_Salz
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| |Footnote=
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| |bild =[[Image:Thecotrichite 19082010-9.jpg|300px]]
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| |mineralogischerName=Thecotrichite
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| |chemischerName =Tricalciumtriacetatchloriddinitrat Heptahydrat
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| |Trivialname =
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| |chemFormel =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
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| |Hydratformen =
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| |Kristallsystem =
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| |Deliqueszenzfeuchte =85% <ref> http://iaq.dk/iap/iap1998/1998_04.htm&lt;br&gt;</ref>
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| |Löslichkeit=
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| |Dichte =
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| |Molvolumen =
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| |Molgewicht =
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| |Transparenz =
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| |Spaltbarkeit =
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| |Kristallhabitus =
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| |Zwillingsbildung =
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| |Brechungsindices =n<sub>x</sub> = 1.491 ± 0.001<br>n<sub>z</sub> = 1.494 ± 0.003<!--<bib id=Halsberghe.etal:/>-->
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| |Doppelbrechung =
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| |optOrientierung=
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| |Pleochroismus =
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| |Dispersion =
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| |Phasenübergang =
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| |chemVerhalten =
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| |Bemerkungen =gefunden auf kalkhaltigen Museumsobjekten
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| }}
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| <!-- == Abstract == -->
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| <br clear=all>
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| == '''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''' ==
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| [[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/>
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| (1) CaCl<sub>2</sub> • 6H<sub>2</sub>O, (2) CaCl<sub>2</sub> • 4H<sub>2</sub>O, (3) CaCl(NO<sub>3</sub>) • 2H<sub>2</sub>O, (4) Ca(NO<sub>3</sub>)<sub>2</sub> • 3H<sub>2</sub>O, (5) Ca(NO<sub>3</sub>)<sub>2</sub> • 4H<sub>2</sub>O, (6) Ca<sub>2</sub>(CH<sub>3</sub>COO)<sub>3</sub>(NO<sub>3</sub>) • 2H<sub>2</sub>O, (7) Ca(CH<sub>3</sub>COO)<sub>2</sub> • H<sub>2</sub>O, (8) Ca(CH<sub>3</sub>COO)Cl • 5H<sub>2</sub>O, (9) 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.<br/>
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| Point T in the phase diagram represents the composition of the triple salt thecotrichite
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| (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).]]
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| 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>.
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| 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.
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| 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.
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| 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.
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| <!--
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| == Vorkommen von Thecotrichite<br> ==
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| <br>
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| == <br> Angaben zu Herkunft und Bildung von Thecotrichite an Objekten<br> ==
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| = Angaben zum Schadenspotential und zur Verwitterungsaktivitätvon Thecotrichite<br> =
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| == Lösungsverhalten ==
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| == Hygroskopizität ==
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| <br>
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| == Kristallisationsdruck ==
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| == Umwandlungsreaktionen<br> ==
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| = Analytischer Nachweis =
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| == Mikroskopie<br> ==
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| '''Laboruntersuchung:'''
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| '''Brechungsindizes:''' <br>'''Doppelbrechung''': Δ =<br>'''Kristallklass'''e: <br>
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| <br> '''Polarisationsmikroskopische Untersuchung:'''<br> <br> <br>'''Verwechslungsmöglichkeiten:'''<br> <br>
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| {| width="100%" cellspacing="0" cellpadding="4" border="2"
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| |-
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| | '''Salzphase'''
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| | <font color="#818181">'''Unterscheidungsmerkmale zu Thecotrichite'''</font>
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| |-
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| | <br>
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| |-
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| | <sub></sub> <br>
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| | <br>
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| |}
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| == Röntgendiffraktometrie ==
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| == Raman-Spektroskopie ==
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| == DTA / TG ==
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| == IR-Spektroskopie ==
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| = Umgang mit Thecotrichiteschäden =
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| = Salze und Salzschäden im Bild =
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| == Am Objekt ==
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| == Unter dem Polarisationsmikrokop ==
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| == Unter dem Rasterelektronenmikroskop ==-->
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| == Weblinks<br> ==
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| <references/>
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| == Literatur ==
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| <biblist/>
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| [[Category:Thecotrichite]] [[Category:Acetate]][[Category:Linnow,Kirsten]] [[Category:R-MSteiger]] [[Category:Bearbeitung]] [[Category:Organ. Salze]] [[Category:Salz]]
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| [[User:SLeithaeuser|SLeithaeuser]] 10:02, 27 June 2012 (CEST) | | [[User:SLeithaeuser|SLeithaeuser]] 10:02, 27 June 2012 (CEST) |
