There are currently many devices using dielectricity that have been put into practice, and dielectricity has become an important area of material science. Polarization controls dielectricity. Students in this course will first gain a classical understanding of the concept of polarization through explanations from the perspective of the electromagnetism of dielectricity, followed by the instructor using classical physics and quantum theory to explain the inducement mechanisms of polarization. The polarization of a material varies with its frequency. This phenomenon is called dielectric dispersion, and is important for understanding dielectrics from a material science perspective, and applying dielectrics. The first half of this course deals with paraelectrics which are polarized by an electric field, but the latter half covers theories and applications of piezoelectric materials which are polarized by stress, pyroelectrics which hold spontaneous polarization without an external signal, as well as ferroelectrics, for which the orientation of spontaneous polarization changes with the electric field.
The purpose of this lecture is to understand the meaning of physical quantities to describe dielectric property of substances as well as the concept of polarization based on the material science. Furthermore, this lecture aims to recall electromagnetic theory, thermodynamics, quantum physics etc., through the learning of dielectricity.
Polarization, Dielectricity, Ferroelectricity, Piezoelectricity
|Intercultural skills||Communication skills||✔ Specialist skills||Critical thinking skills||✔ Practical and/or problem-solving skills|
1) Towards the end of class, students are given exercise problems related to what is taught on that day to solve.
2) Attendance is taken in every class.
|Course schedule||Required learning|
|Class 1||The concept of electric field, electric displacement and potential||Understanding concepts of electric field, electric displacement and potential|
|Class 2||Thermodynamic description of dielectric responses of materials||Understanding thermodynamic theory to describe dielecric response of materials|
|Class 3||Maxwell's equations||Understanding Maxwell's equations and their meaning|
|Class 4||Classical theory of polarization||Understanding polarization mechanisms based on classical theory|
|Class 5||Quantum theory of polarization||Understanding polarization mechanisms based on quantum theory|
|Class 6||Debye type dielectric relaxation||Understanding Debye type dielectric relaxation|
|Class 7||Resonance type dielectric relaxation||Understanding resonance type dielectric relaxation|
|Class 8||Spontaneous polarization and ferroelectrics||Understanding concepts of spontaneous polarization and ferroelectricity|
|Class 9||Point group and tensor||Understanding point group and tensor|
|Class 10||Fundamental of piezoelectricity||Understanding concept of piezoelectricity|
|Class 11||Search method for ferroelectric and piezoelectric materials||Explaining search method for ferroelectric and piezoelectric materials|
|Class 12||Material processing for ferroelectric and piezoelectric materials||Understanding material processing for ferroelectric and piezoelectric materials|
|Class 13||Characterization technique of piezoelectricity||Understanding characterization techniques of piezoelectricity|
|Class 14||Defect chemistry of ferroelectric and piezoelectric materials||Understanding point defects affecting the electric properties of ferroelectric and piezoelectric materials|
|Class 15||Application of ferroelectric and piezoelectric materials||Understanding characteristics of ferroelectric and piezoelectric devices|
Course materials are provided during class.
1) Students will be assessed on their understanding of "theory of polarization", "dielectric relaxation", "ferroelectricity", "piezoelectric materials and their application".
2) Students' course scores are based on midterm and final exams (80%) and exercise problem in every class(20%).