Dachs, Edgar Profilfoto

 

 

Working Group Calorimetry/petrology

  • Dr. C. BERTOLDI (2003-2010)   

 

Research focus:

Synthesis, thermodynamic properties, and phase diagram determination of various materials, especially geologically important minerals and solid solutions, industry-relevant materials (cement phases and Li-ion conductors), metals and alloys, and glasses.

Heat capacity, a key thermodynamic property, is experimentally determined via calorimetry from low to high temperatures. This work started in 2003 with the establishment of the Salzburg Calorimetry Lab. From these measurements other thermodynamic properties, namely the standard entropy of end members and entropies of mixing of solid solutions, are derived. The experimental data can be used further for a number of purposes such as constructing phase diagrams. Figure 1 gives an overview of various mineral end members and solid solutions that have been studied (a list of publications with links to the abstracts of original papers is given below). Quantum-mechanical calculation of heat capacity, using density functional theory (DFT), is another research focus. Calculations are undertaken in order to better understand the microscopic origins of the calorimetrically determined heat capacity behavior.

Published Calorimetric and thermodynamic studies of mineral end members and solid solutions

 

Methods:

  • Low-temperature calorimetry from 2 to 400 K on mg-sized samples using the Physical Properties Measurement System (PPMS).
  • High-temperature calorimetry on mg-sized samples using Differential Scanning Calorimetry (DSC) from 278 to 800 K.
  • Simultaneous thermal analysis (STA) in cooperation with the working group of Prof. N. Hüsing.
  • High-pressure/high-temperature devices including hydrothermal apparatus, piston-cylinder apparatus, and 1 bar furnaces.
  • Quantum-mechanical calculations of solid-state properties: MaterialsStudio software implemented at the high-performance computing center (“Doppler Supercomputer”) at the Department of Scientific Computing.

Projects funded by the austrian science fund (FWF) since 2003:

  • P15880 (E. Dachs, 2003-2006): Low-temperature heat capacities and entropies of minerals
  • P20210 (E. Dachs, 2007-2010): Improvement of two-feldspar thermometry
  • P19268 (C. Bertoldi, 2007-2010): Heat capacity measurements at low temperatures 5-300K
  • P21370 (E. Dachs, 2010-2013): Calorimetric study of garnet solid solutions
  • P23056 (A. Benisek; 2011-2014): Excess-heat capacity of ordered feldspars
  • P25597 (C.A. Geiger, 2013-2016): Crystal-chemical and thermodynamic properties of garnet
  • P28724 (E. Dachs, 2016-2019): A calorimetric study of biotite solid solutions

Sum of funding: € 1.878.000,--

Publications:

Number of publications since 2005 in international peer-reviewed journals: 50

 

Petrological software:

PET: Petrological Elementary Tools for Mathematica®

 

 

Bachelor and master thesis:

  • Baumgartner I. A. (2009) Wärmekapazitäten und Standardentropien wichtiger Amphibolendglieder: Eine kalorimetrische Studie. Master Thesis, University of Salzburg, 94 p.  
  • Salihović M. (2013) Exzessentropie im System Cu-Zn. Bachelor Thesis, University of Salzburg, 45 p.  
  • Paunović A. (2013) Untersuchung der Wärmekapazität und Entropie im System Cu-Zn. Bachelor Thesis, University of Salzburg, 45 p.  
  • Maier M.E. (2013) Exzessentropie von Legierungen in den Systemen Pt-Rh und Ag-Cu. Master Thesis, University of Salzburg, 161 p.  
  • Stelzhammer M.-C. (2014) Wärmekapazität und Entropie im System Pt-Ir. Bachelor Thesis, University of Salzburg, 48 p.  
  • Künzel, R. (2016) Entwicklung einer neuen Methode zur Messung der spezifischen Wärmekapazität von Dämmstoffen an ganzen Platten. Bachelor Thesis, University of Salzburg, 68 p.
  • News
    The lecture series "Politics, History and Culture: Austria in the 20th and 21st Centuries" will be available again during Winter Semester 2018/19 with an exciting program.
    The kick-off of the new career development program, Karriere_Mentoring III, of the Universities of Salzburg, Linz and Krems, which took place in Gmunden on 13 September, was extremely well received.
    A team led by the Salzburg-based young researcher, Therese Wohlschlager, has developed an approach that allows biopharmaceuticals to be characterized more easily and faster than before, and subsequently, can be produced more cheaply.
    Information Event "Unifinanzierung NEU (Fokus Lehre) und Zielvereinbarungsprozess" will be held Tuesday, 16 October, 2018, from 15:00 to 17:00, Thomas Bernhard Hörsaal in the Unipark.
    On Friday, 7 September, 2018, in Berlin, the project "Making Art, Making Media, Making Change!", by Elke Zobl (Associate Professor of Science & Art), received the European Youth Culture Award (EYCA) in the category of "Science and Research”.
    Exhibition opening and conversation with Jian Haake (Kiel). Date: Thursday, 4 October at 18:30. Location: Room for Art at KunstQuartier, Bergstraße 12a. Exhibition Duration: From 5 October until 9 November, 2018. www.w-k.sbg.ac.at/de/kunstpolemik-polemikkunst/aktuelles
    The University Library Salzburg (Main Library and Faculty Library for Law) opens the door to the public and offers a diverse program.
    Political education has been a general teaching principle in Austria since 1978, that is, an educational and developmental task, which is the responsibility of the teachers of all school subjects and grades. The lecture series will show ways in which democracy education can work in different subjects, so that student teachers and educators have different perspectives on the same fundamental challenge.
    Conference in cooperation with the International Robert Musil Society in the KunstQuartier (W & K-Atelier, 1st floor, Bergstr. 12a) // FRAMEWORK PROGRAMM: Thursday, 4 October. VERNISSAGE in the KunstQuartier at 18:30 // Friday, 5 October. BOOK PRESENTATION at 19:30 in the Stefan-Zweig-Centre Edmundsburg // www.w-k.sbg.ac.at/de/kunstpolemik-polemikkunst.
    On the occasion of the Long Night of the Museums 2018, the Casting Collection of the University of Salzburg will be open to the public.
    Putting Successful Models Into Perspective in Europe, 26 – 28 September, 2018, Schloss Rif, University of Salzburg. For students there are discounted day tickets!
    Important dates and information about registering for courses at the Language Center in the Winter Semester 2018/19.
    Brothers Leopold (6 years) and Ferdinand (4 years) explained to their friends: "We go to UNI during the holidays" and were right. They had places in the fully booked summer care program of the University’s Kinderbüro.
    The Leopold Kohr Academy has organized two events, one in September and another in October, 2018. Together with the University of Salzburg, the institution runs the Kohr Archive.
    On Saturday, 22 September, 2018, at 11:00, the Botanical Garden will be displaying the images of the artist, Karin Wimmeder. Only in fair weather. Alternative date: Saturday, 29 September, 2018, 11:00. Musically accompanied by the rhythm group "Schlagartig.org".
    From Hortus Medicus to Pharma Research. An exhibition of the Association of Botanical Gardens 2018.
    On 6 December, 2018, the University of Salzburg will host the WTZ Training Days on the theme of communication, dissemination and distribution in H2020 projects.
  • Veranstaltungen
  • 25.09.18 Welcome Day/Orientierungstag für Erstsemestrige
    26.09.18 Orientierungstag für Erstsemestrige
    26.09.18 Symposium: Prävention der Adipositas im Vorschulalter
    26.09.18 subnetTALK: Postdigitales Design (Vortragssprache DE)
    27.09.18 Symposium: Prävention der Adipositas im Vorschulalter
    27.09.18 Orientierungstag für Erstsemestrige
    28.09.18 Symposium: Prävention der Adipositas im Vorschulalter
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