Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Computational study of the dielectric properties of [La,Sc]2O3 solid solutions

Published

Author(s)

Hiroyoshi Momida, Eric J. Cockayne, Naoto Umezawa, Takahisa Ohno

Abstract

First-principles calculations were used to compute the dielectric permittivities of hypothetical [La,Sc]2O3 solid solutions in the cubic (bixbyite) and hexagonal La2O3 phases. Dielectric enhancement is predicted at small Sc concentrations due to the rattling ion effect. Similar calculations for a model amorphous La2O3 struture show little change in permittivity when a small amount of Sc is substituted for La. In this case, the local environment around the Sc changes in a way that compensates for the rattling ion effect.
Citation
Applied Physics Letters
Volume
107

Keywords

amorphous dielectrics, gate dielectrics, high-k dielectrics, rattling ion effect

Citation

Momida, H. , Cockayne, E. , Umezawa, N. and Ohno, T. (2010), Computational study of the dielectric properties of [La,Sc]<sub>2</sub>O<sub>3</sub> solid solutions, Applied Physics Letters (Accessed March 29, 2024)
Created July 10, 2010, Updated October 12, 2021