Strontium Barium Niobate is a ferroelectric material commonly used in single crystal form in electro-optics, acousto-optics, and photorefractive non-linear optics for its photorefractive properties.
32.
The spontaneous polarization of ferroelectric materials implies a hysteresis effect which can be used as a memory function, and ferroelectric capacitors are indeed used to make ferroelectric RAM for computers and RFID cards.
33.
The dielectric constant of a ferroelectric is typically much higher than that of a linear dielectric because of the effects of semi-permanent electric dipoles formed in the crystal structure of the ferroelectric material.
34.
In lead titanate, another key ferroelectric material, although the structure is rather similar to barium titanate the driving force for ferroelectricity is more complex with interactions between the lead and oxygen ions also playing an important role.
35.
Other hypotheses have been put forward to explain the higher radar reflectivity in the highlands, including the presence of a ferroelectric material whose dielectric constant changes with temperature ( with Venus having a changing temperature gradient with elevation ).
36.
Second, in a similar manner, certain ferroelectric materials can develop stripes consisting of parallel ferroelectric domains, where each domain acts like a photovoltaic and each domain wall acts like a contact connecting the adjacent photovoltaics ( or vice versa ).
37.
"' Relaxor ferroelectrics "'are ferroelectric materials that exhibit high electrostriction ., although they have been studied for over fifty years, the mechanism for this effect is still not completely understood, and is the subject of continuing research.
38.
An additional limitation on size is that materials tend to stop being ferroelectric when they are too small . ( This effect is related to the ferroelectric's " depolarization field " . ) There is ongoing research on addressing the problem of stabilizing ferroelectric materials; one approach, for example, uses molecular adsorbates.
39.
In this work he demonstrated the principles of storing data in ferroelectric materials; the earliest demonstration of Ferroelectric memory, or FeRAM . This work also demonstrated that ferroelectric materials could be used as voltage controlled switches to address memory, whereas close friend and fellow student Ken Olsen's saturable switch used ferrites and was a current operated switch.
40.
In this work he demonstrated the principles of storing data in ferroelectric materials; the earliest demonstration of Ferroelectric memory, or FeRAM . This work also demonstrated that ferroelectric materials could be used as voltage controlled switches to address memory, whereas close friend and fellow student Ken Olsen's saturable switch used ferrites and was a current operated switch.
