Paraelectric–Ferroelectric Phase Transformations in Nanodispersed Powders of KDP Crystals
Zolotarenko A.D. Zolotarenko C.I.D. Matysina Z.A. Shvacho N.A. Akhanova N.E. Ualkhanova M. Shchur D.V. Gabdulin M.T. Zhyrko Y.I. Rudakova O.P. Mironenko T.V. Chimbay M.V. Zagorulko I.V. Zolotarenko O.D.
2024G.V. Kurdyumov Institute for Metal Physics of N.A.S. of Ukraine
Nanosistemi, Nanomateriali, Nanotehnologii
2024#22Issue 2295 - 322 pp.
In the given article, a thermodynamic theory for nanodispersed powders of ferroelectrics of various structures, including KDP crystals as potential hydrogen sorbents, is presented. The article presents the statistical theory of KDP crystals developed on the basis of molecular-kinetic concepts, which allows determining, explaining and substantiating their physical properties. The temperature dependence of the order parameter, which is proportional to the degree of spontaneous polarization and deformation, is determined, and the conditions, under which a phase transition in KDP crystals turns out to be a second-order phase transformation close to a first-order one, are elucidated. The Curie temperature of the phase transition is estimated, and the dependences of the order parameter on the in-tensity of an external electric field or external oriented mechanical stress are established. The configurational heat capacity, its temperature dependence and jumps at the phase-transition point are estimated. The temperature dependences of the direct and inverse permittivities (or suscepti-bility) are determined. The validity of the Curie–Weiss law for KDP crystals is verified.
Curie temper-ature , ferroe-lastics , ferroelectrics , ferrophase , KDP crystals , molecular-kinetic concepts , nanodispersed powders , ordering , paraphase , phase transition
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I. M. Frantsevych Institute for Problems of Materials Science, N.A.S. of Ukraine, 3, Omeljan Pritsak Str, Kyiv, UA-03142, Ukraine
O. O. Chuiko Institute of Surface Chemistry, N.A.S. of Ukraine, 17, General Naumov Str, Kyiv, UA-03164, Ukraine
Kyiv National University of Construction and Architecture, 31, Povitroflots’kyi Ave, Kyiv, UA-03037, Ukraine
Kazakhstan–British Technical University, 59, Tole bi Str, Almaty, KZ-050000, Kazakhstan
National Nanotechnology Open Laboratory (NNOL), al-Farabi Kazakh National University, 71, al-Farabi Ave, Almaty, KZ-050040, Kazakhstan
The Institute of Applied Physics, N.A.S. of Ukraine, 58, Petropavlivs’ka Str, Sumy, UA-40000, Ukraine
G. V. Kurdyumov Institute for Metal Physics, N.A.S. of Ukraine, 36, Academician Vernadsky Blvd, Kyiv, UA-03142, Ukraine
I. M. Frantsevych Institute for Problems of Materials Science
O. O. Chuiko Institute of Surface Chemistry
Kyiv National University of Construction and Architecture
Kazakhstan–British Technical University
National Nanotechnology Open Laboratory (NNOL)
The Institute of Applied Physics
G. V. Kurdyumov Institute for Metal Physics
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