11:45 AM - 12:00 PM
[13a-4C-11] Structural analysis of ferroelectric Hf(Y)O by infrared spectroscopy
Keywords:ferroelectric,hafnium,Hf
We obtained the infrared vibrational spectra of the Pbc21 phase and Pbca phase by first principle calculation using PHASE program, which is difficult to distinguish by XRD experiments. The FTIR spectra of ferroelectric Hf(Y)O was very different from the calculated vibrational spectra of Pbca phase. The main phase of Hf(Y)O is considered to be Pbc21 phase, but not P42/nmc phase nor P21/c phase.