Wontae Chang

TL;DR: It is shown that epitaxial strain from a newly developed substrate can be harnessed to increase Tc by hundreds of degrees and produce room-temperature ferro electricity in strontium titanate, a material that is not normally ferroelectric at any temperature.

TL;DR: In this paper, a strong correlation is observed between the structure and the microwave dielectric properties of epitaxial Ba0.5Sr0.3 (BST) thin films deposited onto MgO by pulsed laser deposition.

TL;DR: In this paper, single phase thin films of Ba0.5Sr 0.5TiO3 (BST) have been deposited onto MgO and LaAlO3 substrates using pulsed laser deposition and the capacitance and dielectric Q (1/tan δ) of as-deposited and annealed films have been measured from 1 to 20 GHz as a function of electric field (0-80 kV/cm) at room temperature using interdigitated Ag electrodes.

TL;DR: In this article, the effects of MgO mixing with BST on BST phase transitions were examined, and it was observed that Mg substitution into BST causes a shift in the cubic-tetragonal BST phase transition peak to a lower temperature.

TL;DR: In this article, an epitaxial Ba1−xSrxTiO3 (BST) thin films have been deposited onto (100) MgO and LaAlO3 substrates using pulsed-laser deposition.