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



  • 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
  • P30977 (C.A. Geiger, 2017-2021): Gesteinsbildende Fe2+-Mg-Silikat-Mischkristalle

Sum of funding: € 2.244.000,--


Number of publications since 2005 in international peer-reviewed journals: 69


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.
  •   Poller J. (2017) Thermodynamische Messungen an Biotit. Bachelor Thesis, University of Salzburg, 45 p.      
  • Hayböck S. (2018) Abhängigkeit der Sprungtemperatur von supraleitendem Nb3Sn von der thermischen Vorbehandlung. Bachelor Thesis, University of Salzburg, 34 p.  
  • News
    During games when there are no fans in local football stadiums, deep acoustic insights into the inner workings of coaches can clearly be heard in TV broadcasts, due to the lack of background noise.Nevertheless, emotional outbursts and arguments among players and coaches have decreased considerably overall, in corona-related “behind closed door matches". Salzburg researchers calculated this using the example of games at FC Red Bull Salzburg. In contrast, more goals were scored across Austria.
    Video recording of the event with a lecture by Univ.-Prof. Dr. Reinhard Klaushofer, Department of Public, International and European Law (from 1h33min).
    Challenges, processes and ambivalences -ÖFEB Social Pedagogy Section Series, Volume 6
    The new edition of the journal for practical philosophy is now online, with its finger on the pulse is also takes into account one topic that is shaping us like no other:the Corona pandemic. It is one of the two main focuses of the issue and its considerable scope not only reflects the importance of this topic, but also the real need to reflect philosophically and ethically on the diverse consequences of this pandemic.
    With the PLUS Talk, a new form of communication was introduced to the Paris Lodron University of Salzburg in 2020. Within the framework of this format members of the rectorate discuss certain key issues with employees of the PLUS, students and public representatives. The discussions take place LIVE and offer participants the opportunity to ask questions on current topics.
    After talks with the ministry and intensive consultation with the deans, the rectorate of the Paris Lodron University of Salzburg has decided that exams should generally only be conducted online at the moment. The following points apply here:
    INTERDISCIPLINARY CONGRESS under the leadership of Reinhard Heinisch, Reinhard Klaushofer, Christoph Kühberger and Margit Reiter
    10 am /Online-Matinee with lecture and discussion „Artes“ series with Robert Brennan and Wolf-Dietrich Löhr.
    As part of the series „MUSIC & MEDICINE“ the cooperation focus group science and culture is organising another online lecture on the 3rd February 2021.
    The Law Academy at the University of Salzburg is offering three online seminars in January 2021 on the topics of an update to competition law (antitrust law and UWG) on Friday, 15 January 2021, an update to company law on Friday, 22 January 2021 and an update to warranty law on Friday, 29th January 2021.
  • Veranstaltungen
  • 28.01.21 Making Art Modern? Views from the Italian Renaissance.
    28.01.21 Kunstgeschichte und Umweltgeschichte im Dialog. Die Darstellung von Wald und Bäumen bei Albrecht Altdorfer und Wolf Huber
    28.01.21 Performing under pressure: Mechanisms and interventions.
    03.02.21 Chorsingen in Zeiten von Corona
  • Alumni Club
  • University of Salzburg's facebook site University of Salzburg's twitter site University of Salzburg's instagram site University of Salzburg's flickr site University of Salzburg's vimeo site