Impact of opal nanoconfinement on the ferroelectric transition in deuterated KDP
| Autor: | N. I. Uskova, D. Yu. Podorozhkin, A. Yu. Milinskiy, E. V. Charnaya, S. V. Baryshnikov |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Ferroelectric phase transition temperature Phase transition Nanocomposite Materials science Spectrometer Physics QC1-999 General Physics and Astronomy Nanoparticle 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Ferroelectricity NMR Ferroelectric nanocomposites Deuterium Chemical physics 0103 physical sciences Magic angle spinning Polar 0210 nano-technology Deuterated KDP Small particles |
| Zdroj: | Results in Physics, Vol 26, Iss, Pp 104354-(2021) |
| ISSN: | 2211-3797 |
| Popis: | Ferroelectric nanocomposites have great potential applications and are in the focus of modern studies. Their polar properties are due to spontaneous polarization in nanoparticles confined to insulator matrices. The crucial problem is the persistence of ferroelectricity under nanoconfinement as the ferroelectric phase transition can shift because of size effects and other grounds. We report the 31P nuclear magnetic resonance studies of nanoparticles of well known ferroelectric potassium dihydrogen phosphate (KDP) embedded into silica opal matrices. Two NMR techniques, static and magic angle spinning (MAS), were applied to confined KDP particles with different levels of deuteration, 80% and > 95%. Measurements were carried out using a Bruker Avance400 pulse spectrometer. Our findings proved unambiguously the pronounced reduction of the ferroelectric transition temperatures in the deuterated KDP/opal nanocoposites compared to the bulk counterparts in striking contrast to previous results. |
| Databáze: | OpenAIRE |
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