What does Morphotropic mean?

September 8, 2019 Off By idswater

What does Morphotropic mean?

Adjective. morphotropic (comparative more morphotropic, superlative most morphotropic) (crystallography) Of or pertaining to morphotropism. Describing a phase transition due to a change in composition. Describing the phase boundary between tetragonal and rhombohedral regions of a ferroelectric.

What is Morphotropic phase boundary piezoelectric?

Morphotropic phase boundary (MPB) compositions of PZT and other two ceramics form the backbone of most of the present day electromechanical devices [1] as the piezoelectric response shows a peak corresponding to an MPB composition.

Which is an example of a morphotropic phase boundary?

Morphotropic phase boundaries (MPB) are composition dependent while polymorphic phase boundaries depend on temperature. Classic examples of a MPB can be found by looking at the phase diagram of the solid solutions PbTiO3-PbZrO3 (PZT) or Pb (Mg,Nb)O3-PbTiO3 (PMN-PT).

Which is an example of a MPB phase boundary?

Classic examples of a MPB can be found by looking at the phase diagram of the solid solutions PbTiO3-PbZrO3 (PZT) or Pb (Mg,Nb)O3-PbTiO3 (PMN-PT). In these, a phase boundary exists between a PT rich tetragonal phase and a region with average rhombohedral phase.

Is the MPB region a complex phase mixture?

It shows an MPB region, in which a complex phase mixture is proposed with the presence of a monoclinic phase. The materials of MPB compositions typically exhibit two phase transitions at TC and TMPB, respectively, as revealed by the dielectric anomalies.

How is a phase boundary a tipping point?

In simple words a phase boundary is a tipping point between two different structures which have the same chemical composition but are separated by a slight difference in their free energies. A reversible phase transition can be achieved when a certain stimulus is provided.

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