scholarly journals Uncovering the symmetry of the induced ferroelectric phase transformation in polycrystalline barium titanate

2021 ◽  
Vol 130 (23) ◽  
pp. 234101
Author(s):  
Lucas Lemos da Silva ◽  
Kai-Yang Lee ◽  
Simon Petrick ◽  
Martin Etter ◽  
Alexander Schökel ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Barium Titanate ◽  
Ferroelectric Phase

scholarly journals Paraelectric/antiferroelectric/ferroelectric phase transformation in As-deposited ZrO2 thin films by the TiN capping engineering

2020 ◽  
Vol 195 ◽  
pp. 109020
Author(s):  
Chun-Yuan Wang ◽  
Chin-I Wang ◽  
Sheng-Han Yi ◽  
Teng-Jan Chang ◽  
Chun-Yi Chou ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
Ferroelectric Phase

Anisotropy of band gap absorption in TlGaSe2 semiconductor by ferroelectric phase transformation

2014 ◽  
Vol 105 (24) ◽  
pp. 242107 ◽  
Author(s):  
Karolis Gulbinas ◽  
Vytautas Grivickas ◽  
Vladimir Gavryushin
Keyword(s):  
Phase Transformation ◽  
Band Gap ◽  
Ferroelectric Phase

Cerium oxide capping on Y-doped HfO2 films for ferroelectric phase stabilization with endurance improvement

2021 ◽  
Author(s):  
Kazuto Mizutani ◽  
Takuya HOSHII ◽  
Hitoshi WAKABAYASHI ◽  
Kazuo TSUTSUI ◽  
Edward Yi Chang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Phase Transformation ◽  
Cerium Oxide ◽  
Remnant Polarization ◽  
Ferroelectric Phase ◽  
Filament Formation ◽  
Conductive Filament ◽  
Phase Stabilization ◽  
Different Temperatures ◽  
Ferroelectric Switching

Abstract The effects of 1-nm-thick CeOx capping on 7.5-nm-thick Y-doped HfO2 films on the ferroelectric characteristics are investigated. From the ferroelectric characteristics of the samples annealed at different temperatures from 450 to 600oC and annealing durations, the time (τ) required to stabilize the ferroelectric phase at each temperature was shortened by the capping. The identical activation energy (Ea) of 2.65 eV for ferroelectric stabilization without and with capping suggests the same kinetics for phase transformation. However, an increase in the remnant polarization (Pr) was obtained. Only a few Ce atoms diffused into the underlying HfO2 film even after 600oC annealing. Ferroelectric switching tests revealed an improvement in endurance from 107 to 1010 by the capping, presumably owing to the suppression of conductive filament formation. Therefore, CeOx capping is effective in promoting the ferroelectric phase in HfO2 with high switching endurance.

A Novel Technique for Determining Local Dielectric Function During Ferroelectric to Paraelectric Phase Transformation in Barium Titanate with a Transmission Eels

1995 ◽  
Vol 404 ◽  
Author(s):  
Kalpana S Katti ◽  
Maoxu Qian ◽  
Mehmet Sarikaya
Keyword(s):  
Phase Transformation ◽  
Barium Titanate ◽  
Energy Loss ◽  
Electron Energy ◽  
Dielectric Function ◽  
Optical Parameters ◽  
Edge Structure ◽  
Transmission Electron ◽  
Electron Energy Loss

AbstractIn this work a transmission electron microscopy (TEM) technique was used in obtaining local dielectric properties calculated from optical parameters for dynamic investigation of the effect of cubic to tetragonal phase transformation in barium titanate. In order to obtain in situ local dielectric during phase transformation, Kramers-Kronig relations were applied using the transmission electron energy loss (EELS) measurements. The optical excitations in the EELS spectra were consistent with the band structure results. The Re (1/ε) (real part of the dielectric function) obtained from the energy loss data indicated a change at the phase transformation. A broadening of the valence plasmon excitation suggested an order-disorder nature to the cubic to tetragonal transformation. In situ electron energy loss near edge structure (ELNES) studies from 500–700 eV energy range near the O-K edge exhibited a pre-edge feature that is associated with the Ti-L1, edge which further indicates an order-disorder nature to the phase transformation. The significance of the results is discussed.

Low-temperature crystallization and paraelectric–ferroelectric phase transformation in nanoscale ZrO2 thin films induced by atomic layer plasma treatment

2020 ◽  
Vol 8 (11) ◽  
pp. 3669-3677
Author(s):  
Sheng-Han Yi ◽  
Kuei-Wen Huang ◽  
Hsin-Chih Lin ◽  
Miin-Jang Chen
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
Low Temperature ◽  
Plasma Treatment ◽  
Ferroelectric Phase ◽  
Atomic Layer ◽  
Treatment Technique ◽  
Low Temperature Crystallization ◽  
Temperature Crystallization

Crystallization and ferroelectricity with high endurance are achieved in ZrO2 thin films at low temperature using an atomic layer plasma treatment technique.

scholarly journals Electric-field-induced paraelectric to ferroelectric phase transformation in prototypical polycrystalline BaTiO3

2014 ◽  
Vol 105 (16) ◽  
pp. 161903 ◽  
Author(s):  
Zhiyang Wang ◽  
Kyle G. Webber ◽  
Jessica M. Hudspeth ◽  
Manuel Hinterstein ◽  
John E. Daniels
Keyword(s):  
Phase Transformation ◽  
Electric Field ◽  
Ferroelectric Phase
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