الفهرس 
contentsOnly 14 pages are availabe for public view
 |  | from | 169 |  |  |
| | | from | 169 | | |
Abstract
The growing interest in studying the physical properties of double sulphates is due to the fact that they show anomalies behavoir at the transition temperature as well as they undergo an iteresting sequence of structural phasetransition this group of crystals exhibit ferroelectric ferroelastics incommensurate and superionic phases.