Physics of the Solid State
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Structure and influence of pressure on low-temperature dielectric properties of nanocomposites based on mesoporous glasses containing K(1-x)(NH4)xH2PO4
Alekseeva O. A.
1, Bogdanov E.V.
2, Molokeev M.S.
2, Naberezhnov A.A.
1, Sysoeva A.A.
1
1Ioffe Institute, St. Petersburg, Russia
2Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
2Kirensky Institute of Physics, Federal Research Center KSC SB, Russian Academy of Sciences, Krasnoyarsk, Russia
Email: alekseeva.oa@mail.ioffe.ru, ebogdanov@sfu-kras.ru, msmolokeev@sfu-kras.ru, alex.nabereznov@mail.ioffe.ru, annasysoeva07@mail.ru
The results of a study of the structure and influence of pressure on the dielectric response of nanocomposite materials based on mesoporous glass with an average pore diameter of 7(2) nm containing solid solutions of (K(1-x)(NH4)xH2PO4 with x=0.05, 0.1 and 0.15) introduced into the pore space are presented. It is shown that in nanocomposites with x=0.1 and 0.15 tetragonal and monoclinic phases coexist. For the composition with x=0.05, the phase diagram TC(P) was obtained and the coefficient dTC/dP~-2.5(2) was determined. In nanocomposites with x=0.05 and 0.15 at P=0, an increase in the ferroelectric phase transition temperature TC is observed compared to similar bulk materials. Keywords: ammonium potassium dihydrogen phosphate, nanocomposite materials, X-ray diffraction, dielectric response.
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