scholarly journals Influence of heat treatment on LiNbO3 thin films prepared on Si(111) by the polymeric precursor method

1999 ◽  
Vol 14 (7) ◽  
pp. 3115-3121 ◽  
Author(s):  
V. Bouquet ◽  
E. Longo ◽  
E. R. Leite ◽  
J. A. Varela
Keyword(s):  
Thin Films ◽  
Heat Treatment ◽  
High Temperature ◽  
Low Temperature ◽  
Thermal Analyses ◽  
Dip Coating ◽  
Treatment Temperature ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method

The effects of heat-treatment temperature on LiNbO3 thin films prepared by the polymeric precursor method were investigated. The precursor solution was deposited on Si(111) substrates by dip coating. X-ray diffraction and thermal analyses revealed that the crystallization process occurred at a low temperature (420 °C) and led to films with no preferential orientation. High-temperature treatments promoted formation of the LiNb3O8 phase. Scanning electron microscopy, coupled with energy dispersive spectroscopy analyses, showed that the treatment temperature also affected the film microstructure. The surface texture—homogeneous, smooth, and pore-free at low temperature—turned into an “islandlike” microstructure for high-temperature treatments.

Low-temperature growth of c-axis-oriented Y-type hexagonal ferrite thin films by the polymeric precursor method

2001 ◽  
Vol 16 (9) ◽  
pp. 2471-2474 ◽  
Author(s):  
Tatsuo Fujii ◽  
Aiko Harano ◽  
Makoto Nakanishi ◽  
Jun Takada
Keyword(s):  
Low Temperature ◽  
Precursor Solution ◽  
Dip Coating ◽  
Treatment Temperature ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method ◽  
Temperature Growth ◽  
Grain Structures ◽  
Heat Treated

Well-crystallized Ba2Zn2Fe12O22 (Zn2–Y) films with high c-axis oritentation were successfully formed on Ag substrates at low temperature by the polymeric precursor method. A precursor solution with stoichiometric Ba2+, Zn2+, and Fe3+ ions was deposited on the substrates by a dip-coating. The films were then heat-treated at temperatures ranging from 700 to 900 °C. The crystallization process of c-axis-oriented Zn2–Y films occurred at the considerably low temperature of 750 °C, though a small amount of spinel oxides contaminated them. The films had hexagonal grain structures which were developed by increasing the heat-treatment temperature. Magnetization curves of the Zn2–Y film heated at 900 °C clearly indicated that the film had large in-plane magnetic anisotropy and had small in-plane coercivity.

scholarly journals Epitaxially grown LiNbO3 thin films by polymeric precursor method

2000 ◽  
Vol 15 (11) ◽  
pp. 2446-2453 ◽  
Author(s):  
V. Bouquet ◽  
M. I. B. Bernardi ◽  
S. M. Zanetti ◽  
E. R. Leite ◽  
E. Longo ◽  
...  
Keyword(s):  
Thin Films ◽  
Optical Properties ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method ◽  
Chemical Route ◽  
Axis Orientation ◽  
Coating Solution

LiNbO3 thin films were grown on (0001) sapphire substrates by a chemical route, using the polymeric precursor method. The overall process consists of preparing a coating solution from the Pechini process, based on metallic citrate polymerization. The precursor films, deposited by dip coating, are then heat treated to eliminate the organic material and to synthesize the phase. In this work, we studied the influence of the heat treatment on the structural and optical properties of single-layered films. Two routes were also investigated to increase the film thickness: increasing the viscosity of the coating solution and/or increasing the number of successively deposited layers. The x-ray diffraction θ-2θ scans revealed the c-axis orientation of the single- and multilayered films and showed that efficient crystallization can be obtained at temperatures as low as 400 °C. The phi-scan diffraction evidenced the epitaxial growth with two in-plane variants. A microstructural study revealed that the films were crack free, homogeneous, and relatively dense. Finally, the investigation of the optical properties (optical transmittance and refractive index) confirmed the good quality of the films. These results indicate that the polymeric precursor method is a promising process to develop lithium niobate waveguides.

Effect of Thermal Treatment on the Morphology of PLZT Thin Films Prepared from Polymeric Precursor Method

2001 ◽  
Vol 189-191 ◽  
pp. 155-160 ◽  
Author(s):  
A.H.M. González ◽  
A.Z. Simões ◽  
José Arana Varela ◽  
M.A. Zaghete ◽  
Elson Longo
Keyword(s):  
Thin Films ◽  
Thermal Treatment ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method ◽  
Plzt Thin Films

Preparation of hexagonal BN whiskers synthesized at low temperature and their application in fabricating an electrochemical nitrite sensor

RSC Advances ◽  
2016 ◽  
Vol 6 (33) ◽  
pp. 27767-27774 ◽  
Author(s):  
Wenpo Luo ◽  
Tao Yang ◽  
Lei Su ◽  
Kuo-Chih Chou ◽  
Xinmei Hou
Keyword(s):  
Low Temperature ◽  
Boron Nitride ◽  
Boric Acid ◽  
Hexagonal Boron Nitride ◽  
Raw Materials ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method ◽  
Nitrite Sensor

Hexagonal boron nitride (h-BN) whiskers were synthesized via the polymeric precursor method using boric acid (H3BO3) and melamine (C3H6N6) as raw materials at 1073–1273 K in flowing nitrogen/hydrogen (5% hydrogen).

scholarly journals Microstructure and dielectric properties of (Ba,Sr)TiO3 thin film produced by the polymeric precursor method

2000 ◽  
Vol 15 (5) ◽  
pp. 1176-1181 ◽  
Author(s):  
F. M. Pontes ◽  
E. B. Araujo ◽  
E. R. Leite ◽  
J. A. Eiras ◽  
E. Longo ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Spin Coating ◽  
Dissipation Factor ◽  
Heating Process ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method ◽  
Chemical Homogeneity ◽  
Bst Thin Films

BaxSr1−xTiO3 (x 4 0.6) (BST) thin films were successfully prepared on a Pt(111)/TiO2/SiO2/Si(100) substrate by spin coating, using the polymeric precursor method. BST films with a perovskite single phase were obtained after heat treatment at 700 °C. The multilayer BST thin films had a granular structure with a grain size of approximately 60 nm. A 480-nm-thick film was obtained by carrying out five cycles of the spin-coating/heating process. Scanning electron microscopy and atomic force microscopy analyses showed that the thin films had a smooth, dense, crack-free surface with low surface roughness (3.6 nm). At room temperature and at a frequency of 100 kHz, the dielectric constant and the dissipation factor were, respectively, 748 and 0.042. The high dielectric constant value was due to the high microstructural quality and chemical homogeneity of the thin films obtained by the polymeric precursor method.

scholarly journals Retention characteristics in Bi3.25La0.75Ti3O12 thin films prepared by the polymeric precursor method

2005 ◽  
Vol 86 (11) ◽  
pp. 112909 ◽  
Author(s):  
A. Z. Simões ◽  
M. A. Ramirez ◽  
N. A. Perruci ◽  
C. S. Riccardi ◽  
E. Longo ◽  
...  
Keyword(s):  
Thin Films ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method ◽  
Retention Characteristics

scholarly journals Fatigue-free behavior of Bi3.25La0.75Ti3O12 thin films grown on several bottom eletrodes by the polymeric precursor method

2004 ◽  
Vol 85 (24) ◽  
pp. 5962-5964 ◽  
Author(s):  
A. Z. Simões ◽  
A. Ries ◽  
F. M. Filho ◽  
C. S. Riccardi ◽  
J. A. Varela ◽  
...  
Keyword(s):  
Thin Films ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method ◽  
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