Book contents
- Frontmatter
- Contents
- Introduction
- 1 Localized and itinerant electrons in solids
- 2 Isolated transition metal ions
- 3 Transition metal ions in crystals
- 4 Mott–Hubbard vs charge-transfer insulators
- 5 Exchange interaction and magnetic structures
- 6 Cooperative Jahn–Teller effect and orbital ordering
- 7 Charge ordering in transition metal compounds
- 8 Ferroelectrics, magnetoelectrics, and multiferroics
- 9 Doping of correlated systems; correlated metals
- 10 Metal–insulator transitions
- 11 Kondo effect, mixed valence, and heavy fermions
- Appendix A Some historical notes
- Appendix B A layman's guide to second quantization
- Appendix C Phase transitions and free energy expansion: Landau theory in a nutshell
- References
- Index
- Periodic Table of the Elements
8 - Ferroelectrics, magnetoelectrics, and multiferroics
Published online by Cambridge University Press: 05 November 2014
- Frontmatter
- Contents
- Introduction
- 1 Localized and itinerant electrons in solids
- 2 Isolated transition metal ions
- 3 Transition metal ions in crystals
- 4 Mott–Hubbard vs charge-transfer insulators
- 5 Exchange interaction and magnetic structures
- 6 Cooperative Jahn–Teller effect and orbital ordering
- 7 Charge ordering in transition metal compounds
- 8 Ferroelectrics, magnetoelectrics, and multiferroics
- 9 Doping of correlated systems; correlated metals
- 10 Metal–insulator transitions
- 11 Kondo effect, mixed valence, and heavy fermions
- Appendix A Some historical notes
- Appendix B A layman's guide to second quantization
- Appendix C Phase transitions and free energy expansion: Landau theory in a nutshell
- References
- Index
- Periodic Table of the Elements
Summary
As discussed at the beginning of Chapter 7, there can exist different types of ordering phenomena connected with charge degrees of freedom. Examples are ordering of charges themselves (charge “monopoles”); ordering of electric dipoles, giving ferroelectricity (FE); or ordering of electric quadrupoles, which happens in orbital ordering. We have already discussed the first and third possibilities; we now turn to the second.
Ferroelectricity is a broad phenomenon, in no way restricted to TM compounds. There are ferroelectrics among organic compounds, in some molecular crystals, in systems with hydrogen bonds. But the best, and most important in practice, are ferroelectrics on the basis of TM compounds such as the famous BaTiO3, or the widely used Pb(ZrTi)O3 (“PZT”). And it is in these compounds that one also sometimes meets a very interesting interplay of ferroelectricity and magnetism – the field now known mostly as multiferroicity. By multiferroics (Schmid, 1994) we refer to materials which are simultaneously ferroelectric and magnetic – possibly ferro- or ferrimagnetic, although such cases are rather rare, most of the known multiferroics being antiferromagnetic. (Sometimes ferroelastic systems are alsoincluded in this class.) In this chapter we discuss these classes of compounds, paying attention mostly to the microscopic mechanisms of ferroelectricity and its eventual coupling to magnetism.
A general treatment of ferroelectricity, dealing mainly with the macroscopic aspects of ferroelectrics and their phenomenological description, with special attention paid to practical applications, may be found in many books, for example Megaw (1957), Lines and Glass (1977), Scott (2000), Gonzalo (2006), Blinc (2011).
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- Transition Metal Compounds , pp. 269 - 309Publisher: Cambridge University PressPrint publication year: 2014
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