Phase transitions in nanostructured K(1-X)(NH4)(X)H2PO4 (X = 0 – 0.15) solid solutions
https://doi.org/10.17586/2220-8054-2017-8-4-535-539
Abstract
Effect of ammonium dihydrogen phosphate admixture on phase transitions in nanostructured solid solutions (1 − x)KH2PO4–(x)(NH4)H2PO4 at x = 0, 0.05 and 0.15 has been studied by dielectric spectroscopy. The samples have been prepared by embedding of aqueous solutions into porous borosilicate glasses. The X-ray diffraction have shown that the crystal structure at room temperature corresponds to the bulk KDP and the average nanoparticle diameters are 49 (2) nm for the sample with 5 % of (NH4)H2PO4 (ADP) and 46 (2) nm for the nanocomposites with 15 % of ADP. Dielectric response data analysis have revealed the shifts of the ferroelectric phase transition temperature as a function of (NH4)H2PO4 concentration: at x = 0 ∆TC is equal to ∼6 K, at x = 0.05 ∆TC ∼3 K and at x = 0.15 ∆TC ∼2 K.
Supporting agencies: A. A. Sysoeva and A. A. Naberezhnov thank the Russian Foundation for Basic Researches (grant 15-02-01413) for financial support. In Peter the Great Saint Petersburg Polytechnic University the studies were carried out in the framework of the grant of Ministry of Education and Science of Russian Federation, No. 3.1150.2017/4.6. Coauthors thank the Engineering Center of the St. Petersburg State Technological Institute for possibility to carry out the characterization of samples on X-rays diffractometer
About the Authors
P. Yu. Vanina
Peter the Great Saint Petersburg Polytechnic University
Russian Federation
Russian Federation
195251; Polytechnicheskaya, 29; St. Petersburg
A. A. Naberezhnov
Ioffe Institute
Russian Federation
Russian Federation
194021; Polytechnicheskaya, 26; St. Petersburg
O. A. Alekseeva
Peter the Great Saint Petersburg Polytechnic University
Russian Federation
Russian Federation
195251; Polytechnicheskaya, 29; St. Petersburg
A. A. Sysoeva
Ioffe Institute
Russian Federation
Russian Federation
194021; Polytechnicheskaya, 26; St. Petersburg
D. P. Danilovich
Engineering center of St. Petersburg State Technological Institute
Russian Federation
Russian Federation
190013; Moskovsky prospect, 26; St. Petersburg
V. I. Nizhankovskii
International Laboratory of High Magnetic Fields and Low Temperatures
Poland
Poland
53-421; Gajowicka, 95; Wroclaw
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Review
For citations:
Vanina P.Yu., Naberezhnov A.A., Alekseeva O.A., Sysoeva A.A., Danilovich D.P., Nizhankovskii V.I. Phase transitions in nanostructured K(1-X)(NH4)(X)H2PO4 (X = 0 – 0.15) solid solutions. Nanosystems: Physics, Chemistry, Mathematics. 2017;8(4):535-539. https://doi.org/10.17586/2220-8054-2017-8-4-535-539
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