They fabricated a special crystal structure called a superlattice from alternating layers of lead titanate (an electrically polar material, whereby one end is positively charged and the opposite end is negatively charged) and strontium titanate
(an insulator, or a material that doesn't conduct electric current).
On the other hand, although early research has showed that the Barium Strontium Titanate
(BST) dielectric has the property to modify its dielectric constant by applying different electric field levels, recent research have shown that this property could be used to develop voltage-controlled capacitors, which in turn, can be used to improve the performances of the oscillators [15-17].
powders were synthesized via hydrothermal route  using strontium hydroxide (99%, Alfa Aesar) and titanium tetrachloride (99.9%, Fisher Scientific) as precursor materials.
Another basic compound is strontium titanate
SrTi[O.sub.3] (denoted as ST), a paraelectric material containing the cubic phase at room temperature.
(STO) and neodymium titanate (NTO) are oxides.
Sodano, "Barium titanate and barium strontium titanate
coated carbon fibers for multifunctional structural capacitors," Journal of Composite Materials, vol.
Cross, "Flexoelectric polarization of barium strontium titanate
in the paraelectric state," Applied Physics Letters, vol.
Electrons zipping through a thin layer of strontium titanate
interact and form pairs at higher temperatures than expected, physicists report in the May 14 Nature.
To understand the physics of condensed matter, researchers are studying the interface between strontium titanate
and lanthanum aluminate, insulators that act as conductors at their interface.
Sazegar et al., "Characterization of metal (Fe, Co, Ni, Cu) and fluorine codoped barium strontium titanate
thick-films for microwave applications," Journal of Electroceramics, vol.
Bi et al., "Hydrothermal syntheses of barium strontium titanate
thin films," Materials Transactions, vol.
Barium strontium titanate
([Ba.sub.x][Sr.sub.1-x]Ti[O.sub.3]/BST) material is one of the ferroelectric material which attract great interest among researchers to study its electrical properties due to high dielectric constant and composition dependent Curie temperature [2, 3].