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Effect of Restricted Geometry on the Structure and Phase Transitions in Potassium Nitrate Nanoparticles |
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| Authors: | A A Naberezhnov P Yu Vanina A A Sysoeva A Ciźman E Rysiakiewicz-Pasek A Hoser |
| Institution: | 1.Ioffe Institute, Russian Academy of Sciences,St. Petersburg,Russia;2.Peter the Great Saint Petersburg Polytechnic University,St. Petersburg,Russia;3.Division of Experimental Physics, Faculty of Fundamental Problems of Technology,Wroclaw University of Science and Technology,Wroclaw,Poland;4.Helmholtz Zentrum Berlin,Berlin,Germany |
| Abstract: | The effect of restricted geometry and thermal prehistory of sample preparation on phase transitions in nanocomposites on base of porous glasses with average pore diameters 7 and 46 nm filled by potassium nitrate have been studied by X-rays and neutron diffraction. The nanoparticle sizes have been determined and phase diagrams (on cooling) for these nanoparticles have been described. It is shown that there is a critical nanoparticle size in the interval from 30 till 20 nm, at which in nanocomposite the ferroelectric phase is realized only regardless of preparation method. |
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