Orientation Control of Perovskite Epitaxial Thin Film on Silicon Substrate with Yttria-Stabilized Zirconia Buffer Layers

2006 ◽  
Vol 320 ◽  
pp. 69-72 ◽  
Author(s):  
Masao Kondo ◽  
Kazuaki Kurihara
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Buffer Layer ◽  
Layer Structure ◽  
Rare Earth Oxide ◽  
Calcium Titanate ◽  
Rare Earth Oxides ◽  
Yttria Stabilized Zirconia ◽  
Buffer Layers ◽  
Stabilized Zirconia

The influence of a rare earth oxide/yttria-stabilized zirconia (YSZ) double buffer layer structure on the orientation of a perovskite thin film was investigated on (100) silicon substrates. A calcium titanate perovskite film with a mixture of (110) and (100) orientation was grown epitaxially on a YSZ buffer layer. Since rare earth oxides have almost the same chemical nature and different lattice parameters, it is anticipated that the lattice parameter of the buffer layer can be controlled by changing the rare earth element. An (100) oriented epitaxial calcium titanate film was obtained by changing the composition of rare earth oxides on the YSZ/Si substrate.

Rare-Earth Oxides Blended With Yttria-Stabilized Zirconia Thermal Barrier Coatings for Improved Resistance to Sand Adherence and Calcia-Magnesia-Alumino-Silicate (CMAS) Infiltration

2019 ◽  
Author(s):  
Clara Mock ◽  
Michael J. Walock ◽  
Andrew Wright ◽  
Andy Nieto ◽  
Anindya Ghoshal ◽  
...  
Keyword(s):  
Rare Earth ◽  
Thermal Barrier Coatings ◽  
Weight Percent ◽  
Rare Earth Oxides ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Stabilized Zirconia ◽  
Fine Particulates ◽  
Barrier Coatings

Abstract Military rotorcraft are particularly susceptible to engine damage from environmental particulates. While inertial particle separators are efficient at removing large particles, fine particulates (75 μm or smaller) are still entering the engine. Once into the hot-section, these fine particulates melt, impinge the hot-section components, and solidify as calcia-magnesia-alumina-silicate (CMAS) glasses. Infiltration from these glassy deposits can significantly reduce component lifetimes through the loss of strain tolerance and increased thermal conductivity within the thermal barrier coatings (TBCs) protecting the underlying substrates. Engine life knockdowns can lead to significant increases in the operations and sustainment costs of military aviation assets. In addition, the adhesion and build-up of the glassy CMAS deposit on hot-section components can lead to rapid performance degradation, which has resulted in the loss of aircraft and loss of life incidents during military operations in particle-laden environments. The Army Research Laboratory (ARL) is working to develop sandphobic coatings that are resistance to molten sand adhesion and the buildup of glassy CMAS deposits. To this end, this paper/presentation will focus on recent results from blending rare-earth oxides (REO) with yttria-stabilized zirconia thermal barrier coatings. Gadolinia powder was mixed with eight (8) weight percent yttria-stabilized zirconia (8YSZ) powder for consolidation via air plasma spray onto Inconel 718 discs (1-in diameter) and tested in the Hot Particulate Ingestion Rig (HPIR) under engine-relevant conditions, using AFRL-02 synthetic sand. The as-processed and tested samples were characterized using optical microscopy (OM) and scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDS). Preliminary results show that mixing REOs with 8YSZ can significantly reduce molten sand adhesion compared to pure 8YSZ.

Ferroelectric La-Sr-Co-O / Pb-Zr-TI-O / La-Sr-Co-O Heterostructures on Silicon: Reliability Testing

1993 ◽  
Vol 310 ◽  
Author(s):  
R. Ramesh ◽  
T. Sands ◽  
V. G. Keramidas ◽  
D.K. Fork
Keyword(s):  
Thin Film ◽  
Buffer Layer ◽  
Applied Field ◽  
Room Temperature ◽  
Yttria Stabilized Zirconia ◽  
Layered Perovskite ◽  
Reliability Testing ◽  
Stabilized Zirconia ◽  
Thin Film Capacitors ◽  
Large Remnant Polarization

AbstractWe report results of pulsed electrical testing of ferroelectric Pb0.9La0.1Zr0.2Ti0.8O3 thin film capacitors with symmetrical La-Sr-Co-O top and bottom electrodes at room temperature and at 100°C. They have been grown on [001] Si with a Yttria stabilized zirconia (YSZ) buffer layer. A layered perovskite “template” layer (200-300Å thick), grown between the YSZ buffer layer and the bottom La-Sr-Co-O electrode, is critical for obtaining the required orientation of the subsequent layers. When compared to the capacitors grown with Y-Ba-Cu-O (YBCO) top and bottom electrodes, these structures possess two advantages : (1) the growth temperatures are lower by 60-150°C; (ii) the capacitors show a large remnant polarization, δP, ( δP = switched polarization -non-switched polarization), 25-30 μC/cm2, for an applied voltage of only 2V (applied field of 70kV/cm). The fatigue, retention and aging characteristics of these new structures are excellent at both room temperature and at 100°C.

Tailoring of highly-stable Mn1-x-y(CexLay)O2-δ pseudocapacitor thin-film and rare earth oxide nanospheres through selective purification of rare earth oxides derived from Ni-MH batteries

2022 ◽  
Author(s):  
Samane Maroufi ◽  
Sajjad S. Mofarah ◽  
Rasoul Khayyam Nekouei ◽  
Veena Sahajwalla
Keyword(s):  
Thin Film ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
State Of The Art ◽  
Rare Earth Oxide ◽  
Rare Earth Oxides

Growing utilisation of rare earth elements (REEs) has caused serious shortages in REEs’ supply and shifting state-of-the-art approaches toward sustainable recycling of existing REEs. The present work details a three-stage...

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