of thermal strains M. B. Okatan, M. W. Cole, and S. P. Alpay Materials Science and Engineering Program, Department of Chemical, Materials, and Biomolecular Engineering, University of Connecticut, Connecticut 06269, USA Institute of Material Science, University of Connecticut, Connecticut 06269, USA U. S. Army Research Laboratory, Weapons and Materials Research Directorate, Aberdeen Proving Grou...

Ba0.5Sr0.5TiO3 ~BST! thin films grown on Si by an in situ ultraviolet-assisted pulsed laser deposition ~UVPLD! technique exhibited significantly higher dielectric constant and refractive index values and lower leakage current densities than films grown by conventional PLD under similar conditions. X-ray photoelectron spectroscopy ~XPS! investigations have shown that the surface layer of the gro...

We developed a method for production of arrays of platinum nanocrystals of controlled size and shape using templates from ordered silica bead monolayers. Silica beads with nominal sizes of 150 and 450 nm were self-assembled into monolayers over strontium titanate single crystal substrates. The monolayers were used as shadow masks for platinum metal deposition on the substrate using the three-st...

A method is proposed for the determination of barium and strontium peroxides (active oxygen) in igniters in small-arms tracer ammunition. The sample is treated with dilute hydrochloric acid (1 + 9) which dissolves the magnesium powder almost instantaneously and then dissolves the barium or strontium peroxides within 10-30 min. The solution is then filtered to remove the organic substances (calc...

Strontium Titanate SrTiO3 (STO) is known to undergo an antiferrodistortive transition from cubic to tetragonal phase at Tc ≈ 105K, and classical to quantum paraelectric phase transition at Tq ≈ 37K. This paper is intended to use Landau Theory to explore these two phase transitions of STO, as well as some experimental techniques to examine this model.

The direct piezoelectric effect of BaTiO3↔ Ba1−xSrxTiO3 graded ferroelectrics, whose compositions change in a sinusoidal form, is investigated via an extended phase-field method. obtained results demonstrate that the coefficient can be significantly enhanced by controlling amplitude variation. origin enhancement considering formation polarization domain structures and their behaviors under stra...

A ferroelectric heater under A.C. field was demonstrated by using lead zirconate titanate and barium titanate ceramics. The temperature of the ceramics was increased from room temperature to its curie temperature of phase transition under an A.C. field. The heating characteristics greatly depend on the compositions of ceramics. It is proposed that the heating behavior is related to the domain s...