Title=Ferroelectric

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Synthesis and Ferroelectric Properties of KNO3 films (2.13)

Student's Manual This experiment illustrates the ferroelectric behavior of KNO3 due to change in temperature which is intimately connected to the change in crystal structure.
Sample Results


Ferroelectric loop at 130˚C
Another instance of a ferroelectric loop at 110˚C
Ferroelectric loop at 80˚C
Simulation results when sample capacitor is a conventional linear capacitor

Further Readings and References "A classroom experiment to demonstrate ferroelectric hysteresis", M. Dawber, I. Farnan, and J.F. Scott, Am. J. Phys., 71(8), 2003.

"Rochelle Salt as a dielectric", C.B. Sawyer and C.H. Tower, Phys.Rev. 35, 269 1930.
"Growth and single crystal refinement of phase-III potassium nitrate, KNO3", Evelyn J. Freney, Laurence A.J. Garvie, Thomas L. Groy and Peter R. Buseck, Acta Cryst. B 65, 659, 2009.
Ferroelectric hysteresis measurement and analysis, M. Stewart and M.G. Cain, National Physical Laboratory, University of Manchester, 1999.
The phase diagram of KNO3 to 40 Kbars, E. Rapoport, G.C. Kennedy, , J. Phys. Chem. Solids, 26, 1995, 1965.
Properties of Materials: Anisotropy, Symmetry, Structure, R.E. Newnham, Oxford, p. 174.
Basic Solid State Chemistry, Anthony R. West, John Wiley and Sons, p.53-56, 331-338, 1996.

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