Journal of Thermal Analysis and Calorimetry

, Volume 118, Issue 2, pp 1021–1031 | Cite as

Pulse annealing electron paramagnetic resonance with probing transition ions

Application to thermal formation and growth of nanoZnO
  • S. V. Nistor
  • M. Stefan
  • D. Ghica


The analysis of the sequence of electron paramagnetic resonance (EPR) spectra of trace amounts of substitutional probing paramagnetic ions incorporated in (nano)crystalline samples submitted to isothermal and isochronal pulse annealing treatments can offer a wealth of information on the thermally induced compositional and structural changes of the host material. The potential of this new thermal analysis method is illustrated here with results of such investigations on the thermal decomposition of crystalline zinc hydroxide (Zn(OH)2) and anhydrous zinc carbonate basic (Zn5(CO3)2(OH)6) precursors containing trace amounts of substitutional Mn2+ probing ions into nanostructured zinc oxide-ZnO. The quantitative analysis of the sequence of isochronal pulse annealing EPR spectra could provide, besides the thermal decomposition curves of the two precursors, additional information about the structure of the resulting nanostructured ZnO, some of it hard to get by standard structural diffraction techniques. The analysis of both isochronal and isothermal pulse annealing EPR data was further used to investigate the crystallization mechanism of the initially formed nanostructured disordered ZnO and to quantitatively describe the further growth of the resulting ZnO nanocrystals with the increasing annealing temperature and duration.


Electron paramagnetic resonance Thermal analysis Pulse annealing Transition metal ions Mn2+ 



This work has been supported by Unitatea Executiva pentru Finantarea Invatamantului Superior a Cercetarii, Dezvoltarii si Inovarii, Project PNII-ID-74/2011. We would like to thank Leona C. Nistor and Ioana Vlaicu for contributions to the work contained within the manuscript. This article was written through equal contributions of all authors.


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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2014

Authors and Affiliations

  1. 1.National Institute of Materials PhysicsMagureleRomania

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