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 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.

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 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.

Synthesis of Nano CuO by Polymeric Precursor Method and its Low Temperature Reduction to Stable Copper Nanoparticles

2011 ◽  
Vol 15 ◽  
pp. 11-20 ◽  
Author(s):  
V. Andal ◽  
G. Buvaneswari
Keyword(s):  
Low Temperature ◽  
Metallic Copper ◽  
Glass Plate ◽  
Copper Nitrate ◽  
Reducing Agent ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Dispersion Method ◽  
Plate Method ◽  
Precursor Method

CuO nanoparticles showing different morphologies were prepared by polymeric precursor method using three different copper sources: basic copper carbonate, copper nitrate and copper hydroxide. The decomposition temperature of the precursors varies from 200 C to 400 C. The effect of the concentration of the polymeric additive was studied. The CuO nanopowder was reduced to metallic copper at low temperature using hydrazine hydrate as a reducing agent. The oxide was treated with the reducing agent in two forms: (1) as dispersion in 0.1% PVA (dispersion method) (2) as slurry with 0.1% PVA applied on a glass plate (plate method). The maroon copper metal nanofluid achieved in dispersion method was stable for six months and the copper nanopowder obtained from the plate method showed stability for more than six months. The precursor, CuO and Cu nanomaterials were characterized by powder XRD, FT-IR, TGA, SEM and TEM techniques.

scholarly journals Preparation of 0.055BaZrO3–0.935(K0.45Na0.5Li0.05)NbO3–0.01(Bi0.5Na0.5)TiO3 piezoelectric thin films from precursor solution by Pechini method

2017 ◽  
Vol 07 (02) ◽  
pp. 1750014 ◽  
Author(s):  
Liqiang Liu ◽  
Tomoaki Karaki ◽  
Tadashi Fujii ◽  
Yuichi Sakai
Keyword(s):  
Thin Films ◽  
Preparation Method ◽  
Pechini Method ◽  
Precursor Solution ◽  
Lead Free ◽  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method ◽  
Si Substrates ◽  
Piezoelectric Thin Films

Lead-free piezoelectric thin films of 0.055BaZrO3–0.935(K[Formula: see text]Na[Formula: see text]Li[Formula: see text])NbO3–0.01(Bi[Formula: see text]Na[Formula: see text])TiO3 (BZ–KNLN–BNT) were fabricated on (100)-LaNiO3/SiO2/Si substrates. The Pechini (polymeric precursor) method was carried out to prepare the complicated multi-component precursor solution. This method was suited for controlling the complex components accurately. The films crystallized at 700[Formula: see text]C showed a (100)pc-oriented perovskite structure, whose grain size was about 200[Formula: see text]nm and thickness was about 700[Formula: see text]nm. The Curie temperature [Formula: see text]c of the films was 292[Formula: see text]C that was near to that of the bulk ceramics. The preparation method used in this work provided a possibility for the application of multi-component lead-free piezoelectric films.

Synthesis of Bi4Ge3O12 ceramic scintillators by the polymeric precursor method

2009 ◽  
Vol 100 (2) ◽  
pp. 537-541 ◽  
Author(s):  
Fabiane Alexsandra Andrade de Jesus ◽  
Ronaldo Santos da Silva ◽  
Zélia Soares Macedo
Keyword(s):  
Polymeric Precursor Method ◽  
Polymeric Precursor ◽  
Precursor Method
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