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Assignment for the Course ‘Ferroelectric materials and Applications’ Ferro 1: - Define in your own word a first and second order phase transition - Draw the Gibbs energy versus the electric field (or vs. the electric displacement) for each case - Draw the Polarization dependence on Temperature for each case - For a ferroelectric material, is it easy to discriminate between 1st and 2nd order transition in an electric field? Why? Ferro 2: - Draw the dependence on the Electric filed of the Polarization in a dielectric - Draw the dependence on the Electric filed of the Polarization in a ferroelectric - Define in your own word the Saturation polarization Ps, the remnant polarization Pr, and the coercive field Ec. - What is the difference between Ps and Pr? Could they be the same? If yes, in which case? Ferro 3: - If the elastic energy in purely harmonic (has a quadratic dependence on P), is ferroelectricity possible? - What other condition the harmonic term of the elastic energy should fulfil? Ferro 4: - Why is there domain in ferroelectrics? - What are domain walls? Do they correspond to special planes in the solid? - Describe in your own work the difference between 90° and 180 ° domain wall - How can I make the difference between them (let’s assume I have an AFM at diposal) - Describe in your own work the switching process in terms of ferroelectric domains Ferro 5: - Cite at least 3 applications of ferroelectric materials - According to you, where is it mostly used (and what property of ferroelectrics is used)? - According to you, where is the future potential of ferroelectrics?