Phase transition in NH4HSO4–porous glasses nanocomposites
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- 作者：Agnieszka Ci?man (1)
Tomasz Marciniszyn (1)
Dirk Enke (2)
Andrei Barascu (3)
Ryszard Poprawski (1) - 关键词：Size effect ; Ferroelectrics ; Porous glasses nanocomposite ; AHS nanocompoistes
- 刊名：Journal of Nanoparticle Research
- 出版年：2013
- 出版时间：July 2013
- 年：2013
- 卷：15
- 期：7
- 全文大小：595KB
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Tomasz Marciniszyn (1)
Dirk Enke (2)
Andrei Barascu (3)
Ryszard Poprawski (1)
1. Institute of Physics, Wroc?aw University of Technology, Wybrze?e Wyspiańskiego 27, 50-370, Wroc?aw, Poland
2. Institut für Technische Chemie, Universit?t Leipzig, Linnéstr. 3, 04103, Leipzig, Germany
3. Institut für Nichtklassische Chemie e.V., Permoserstr. 15, 04318, Leipzig, Germany - ISSN：1572-896X
文摘
The results of investigations of porous glasses (PG) and porous glasses–ammonium hydrogen sulfate ferroelectric nanocomposites (AHS–PG) are presented. On the basis of dielectric and calorimetric measurements it was shown that in the AHS–PG nanocomposites with average pore size of 44, 68, 95, and 320?nm the anomalies of dielectric permittivity and specific heat similar to those in bulk crystals AHS are observed. An influence of the mean value of pores sizes on the ferroelectric phase transition temperatures of AHS nanocrystals embedded into the porous matrices was determined. It was shown that in AHS–PG dispersion of the dielectric permittivity is observed in both para- and ferro-electric phases and above room temperature AHS–PG nanocomposites exhibit the ionic conductivity.