Effects of bonding configuration and structural perfection on the properties of doped NaNbO3-based solid solutions

The effects of bonding configuration (electronegativity) and doping-produce d vacancies on the properties of doped NaNbO3-based solid solutions were st udied. The results demonstrate that there is an average electronegativity o f the elements involved above which the uniform distortion parameter delta increases and the relative dielectric permittivity epsilon (T)(33)/epsilon (o) decreases with increasing electronegativity, as is common in other soli d-solution systems. Below this value, both delta and epsilon (T)(33)/epsilo n (o) vary in the opposite way. An explanation for the anomalous behavior o f delta is proposed.