Synthesis, structure, and dielectric properties of KH2PO4 fractal aggregates

Autor:	S. V. Spitsina, L. N. Korotkov, I. V. Zolotukhin, L. I. Yanchenko
Rok vydání:	1999
Předmět:	Phase transition Tetragonal crystal system Fractal Materials science Precipitation (chemistry) Thermodynamics Crystallite Dielectric Atmospheric temperature range Condensed Matter Physics Ferroelectricity Electronic Optical and Magnetic Materials
Zdroj:	Scopus-Elsevier
ISSN:	1090-6460 1063-7834
DOI:	10.1134/1.1131120
Popis:	Macroscopic fractal aggregates of KH2PH4 (KDP) measuring up to 500 µm have been obtained. The fractal structure forms as a result of the precipitation of KDP particles from a supersaturated aqueous solution in the presence of a temperature gradient followed by a diffusioncontrolled mechanism of aggregation. The electron-microscopic analysis performed has shown that the fractals are formed predominantly from crystallites of the tetragonal modification measuring ∼1 µm. The dielectric constant (ɛ) of fractal KH2PO4 has been measured in the temperature range 80–300 K. A characteristic anomaly has been discovered on the ɛ(T) curve in the vicinity of 122 K, which attests to a ferroelectric phase transition. The absolute value of ɛ is significantly smaller than the components ɛ11 and ɛ33 for KH2PO4.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f2947801b576ac2294f9b83515c0a922 https://doi.org/10.1134/1.1131120 Zobrazit plný text záznamu Full text from SpringerLink