1 : 1 Ordered Domain Growth in Pb ( Mg 1 / 3 Ta 2 / 3 ) O 3 – La ( Mg 2 / 3 Ta 1 / 3 ) O 3 Relaxor Ferroelectric Perovskites
نویسندگان
چکیده
Single-phase perovskite solid solutions are formed across the entire (1 − x)Pb(Mg1/3Ta2/3)O3–xLa(Mg2/3Ta1/3)O3 (PLMT) pseudobinary system. Although as-sintered (1300°C, 3 h) samples with x ≤ 0.1 adopt a phase-separated, “PMN-type” microstructure comprising small (2–3 nm) ordered domains dispersed in a disordered matrix, extensive domain growth and complete order can be induced by extended thermal annealing (1300°C, 24 h). These observations, and the alterations in the thermal stability and domain size across the system, can be interpreted using a charge-balanced random site model for the cation order. No evidence is found to support the space-charge models currently used to describe the cation ordering and properties of the corresponding niobate systems.
منابع مشابه
Pii: S0022-3697(99)00275-9
High temperature thermal treatments were used to modify the cation order in several tantalate and niobate members of the Pb(Mg1/3Nb2/3)O3 (PMN) family of relaxors. The observation of complete 1:1 structural order in several compositions, and the refined cation occupancies of well-ordered samples conflict with the predictions of the “space charge” model, and support the “random site” description...
متن کاملPb ( Mg 1 / 3 Nb 2 / 3 ) O 3 ( PMN ) Relaxor : Dipole Glass or Nano - Domain Ferroelectric ?
متن کامل
Influence of Cation Order on the Dielectric Properties of Pb(Mg1/3Nb2/3)O3-Pb(Sc1/2Nb1/2)O3 (PMN-PSN) Relaxor Ferroelectrics
The effect of the B-site cation chemistry and ordering on the dielectric properties of solid solutions in the (1-x)Pb(Mg1/3Nb2/3)O3-Pb(Sc1/2Nb1/2)O3 (PMN-PSN) perovskite system was examined in samples with 0.1 ≤ x ≤ 0.9. Thermal annealing treatments were effective in inducing long-range B-site order in the samples within this compositional range. The well-ordered, large chemical domain ceramics...
متن کاملCharacterization of piezoelectric materials with large piezoelectric and electromechanical coupling coefficients.
The relaxor based ferroelectric (1-x)Pb(Zn(1/3)Nb(2/3))O(3)-xPbTiO(3) and (1-x)Pb(Mg(1/3)Nb(2/3))O(3)-xPbTiO(3) single crystals provided new challenges in property characterization because their extraordinarily large piezoelectric coefficients and electromechanical coupling coefficients. Large errors may occur in some of the derived material constants using conventional characterization techniq...
متن کاملElectromechanical properties and anisotropy of single- and multi-domain 0.72Pb(Mg(1∕3)Nb(2∕3))O(3)-0.28PbTiO(3) single crystals.
Complete sets of elastic, piezoelectric, and dielectric constants of 0.72Pb(Mg(1∕3)Nb(2∕3))O(3)-0.28PbTiO(3) single crystal poled along [111](c) (single domain) as well as non-polar axes [001](c) and [011](c) (multidomain) have been measured under natural conditions. These data allowed us to evaluate accurately the extrinsic contributions to the superior piezoelectric properties. Very large ext...
متن کامل