Preferentially oriented (La, Sr)CoO3/PbLa0.1TiO3(La, Sr)CoO3tri-layers on lithium-fluoride and sodium-chloride substrates
作者:
Judy Wu,
S.C. Tidrow,
M.Z. Tidrow,
M.H. Ervin,
RobertC. Hoffman,
C.Wesley Tipton,
DaleN. Robertson,
WilliamW. Clark,
期刊:
Integrated Ferroelectrics
(Taylor Available online 2000)
卷期:
Volume 28,
issue 1-4
页码: 103-112
ISSN:1058-4587
年代: 2000
DOI:10.1080/10584580008222224
出版商: Taylor & Francis Group
关键词: Salts;ferroelectric;epitaxy;infrared
数据来源: Taylor
摘要:
(La, Sr)CoO3/PbLa0.1TiO3/(La, Sr)CoO3tri-layers have been grownin situusing pulsed laser deposition on single crystal LiF and NaCl substrates because of their potential to serve as substrates and sacrificial layers for building suspended infrared detector structures. At growth temperatures around 525°C to 615°C and oxygen partial pressures of ∽25 mTorr, the LaSrCoO3/PbLaTiO3/LaSrCoO3tri-layers on LiF substrates exhibit preferential orientation, as indicated by x-ray diffraction data. The surface morphology of each successive layer is smooth, as shown in scanning electron microgram. Higher growth temperatures result in better orientations but suffer from substrate out-gassing, while lower growth temperatures lead to polycrystalline film growth. On the NaCl substrates, buffer layers, such as Pt and Pd, are necessary to achieve oriented films by suppressing severe substrate out-gassing at the growth conditions required for stoichiometric (La, Sr)CoO3/PbLa0.1TiO3/(La, Sr)CoO3tri-layer growth.
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