Dielectric properties of Ba(ClO<inf>3</inf>)<inf>2</inf> · H<inf>2</inf>O single crystal

The variation of dielectric constant (ε′) and loss tangent (tan δ) has been studied along three orthogonal directions, as a function of temperature (32 to 325°C) and frequency (102 to 105 Hz and at 1010 Hz) for a solution grown single crystal of barium chlorate monohydrate (Ba(ClO3)2 · H2O). A characteristic decrease in ε′ has been observed for the loss due to the crystallization water. The small anisotropy observed is due to the alignment of crystalline water dipoles along the b‐axis, which corresponds to crystal structure data and PMR results. The dielectric behaviour along the three axes is similar except for the loss tangent peak for the crystallization water at 4 kHz when measured along the b‐axis at room temperature, which shifts to higher frequencies with temperature. The activation energy is estimated to be 0.64 eV. Copyright © 1973 WILEY‐VCH Verlag GmbH & Co. KGaA