Synthesis, structure, and dielectric properties of KH2PO4 fractal aggregates |
| |
Authors: | I V Zolotukhin S V Spitsina L I Yanchenko L N Korotkov |
| |
Institution: | (1) Voronezh State Technical University, 394026 Voronezh, Russia |
| |
Abstract: | 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 ɛ
11 and ɛ
33 for KH2PO4.
Fiz. Tverd. Tela (St. Petersburg) 41, 2059–2061 (November 1999) |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|