tetragonal phase tagged posts

The authors observed in real-time the transformation of a HfO2 nanorod from its room temperature to tetragonal phase, at 1000° less than its bulk temperature. Nanorod surfaces and twin boundary defects (pictured here) serve to kinetically trap this phase.

Materials research creates potential for improved computer chips and transistors. The inorganic compound hafnium dioxide commonly used in optical coatings has several polymorphs, including a tetragonal form with highly attractive properties for computer chips and other optical elements. However, because this form is stable only at temperatures above 3100F – scientists have had to make do with its more limited monoclinic polymorph. Until now...