Abstract
Dielectric, thermal expansion and mechanoelastic measurements as a function of the temperature in Lithium Sodium Niobate (Li x Na 1 −x )NbO 3 ceramics in the low Lithium content side, X ≤ 12%, have been performed. The obtained results from the different techniques in the 300 K-1000 K-temperature interval show several reversible anomalies besides that corresponding to the main ferro-paraelectric phase transition at Tc. The anomalies above Tc show a ferroelastic character and those below Tc are of the ferroelectric type. The existence of ferroeleastic phases is non-dependent on the Li content. A secondary ferroelectric phase below Tc (T’ ≈ 560 K) stabilizes only for X ≥ 10%Li content and the anomaly for X < 5% Li content could better considered as a diffusive ferroelectric phase transition. The main ferro-paraelectric phase transition was attributed to Na displacements but the other observed phase transitions are better accounted for NbO 6 octahedra tilts.
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