Ferroelectric Module

This analysis module provides STEP with common models applied to ferroelectric materials. It is one of the four modules included with the Basic STEP Package. The models available for a given set of data depend on the variable plotted on the x-axis. Some models can be fitted in a modified form to account for hysteresis. In most cases this is done by fitting the original form of the model to the average of the top and bottom curves of the data set and fitting a polynomial to the difference between the top and bottom curve.

A modified form of Piquette and Forsythe’s model is provided where the top and bottom branches of the hysteresis curve are modelled by shifting the original model with a coercive electric field, Ec.

Linked models require dual data sets where the non-linked model is fitted first, and the linked model is fitted to the data using x data points provided by the non-linked model.

Electric Field (E) as X-axis

Y-axis

Model

Hysteresis

D

Chen et al

Intrinsic

D

Piquette and Forsythe shifted by E_c

Intrinsic

S

Linked Mason's

Depends on linked model giving D

S

chen et al with Mason's

Intrinsic

Electric Displacement (D) as X-axis

Y-axis

Model

Hysteresis

S

Mason's

Odd polynomial

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