Oxide-Diamond Composite Coating Via Sol-Gel Method

1988 ◽  
Vol 121 ◽  
Author(s):  
Azar Nazeri-Eshghi ◽  
J. D. Mackenzie ◽  
J.-M. Yang
Keyword(s):  
Thermal Gradient ◽  
Synthetic Diamond ◽  
Composite Coatings ◽  
Sol Gel ◽  
Soda Lime ◽  
Fused Silica ◽  
Diamond Composite ◽  
Micron Size ◽  
Gel Processing

ABSTRACTUse of micron-size particles of synthetic diamond in oxide matrices prepared by sol-gel processing is explored. Alumina and borosilicate-diamond composite coatings are deposited on soda-lime microscope glass and fused silica substrates using dipping technique and thermophoresis. By varying the thermal gradient between the substrate and the solution, the quality of the films and the concentration of the particles can be controlled.

Crystalline magnesium oxide films on soda lime glass by sol–gel processing

2002 ◽  
Vol 54 (2-3) ◽  
pp. 120-123 ◽  
Author(s):  
S Chakrabarti ◽  
D Ganguli ◽  
S Chaudhuri ◽  
A.K Pal
Keyword(s):  
Magnesium Oxide ◽  
Sol Gel ◽  
Oxide Films ◽  
Soda Lime ◽  
Soda Lime Glass ◽  
Gel Processing

Sol-Gel Processing of Advanced Dielectric Ceramics for Microwave Applications

1989 ◽  
Vol 155 ◽  
Author(s):  
M. Schnoeller ◽  
W. Wersing
Keyword(s):  
Sol Gel ◽  
Wet Milling ◽  
X Ray Diffraction ◽  
Powder Morphology ◽  
Drying Procedures ◽  
Microwave Components ◽  
Sol Gel Process ◽  
Dielectric Ceramics ◽  
Gel Processing

ABSTRACTHighly dielectric ceramics make it possible to markedly miniaturize passive microwave components. We have successfully synthesized ceramic powders of the most important microwave ceramic systems (ZrTiSn)O2, Ba(TiNiZnTa)O3 and Ba(MgTa)O3 by using the sol-gel process. Nonaqueous solutions of metal organics together with different inorganic metal salts were used as precursors. The gels derived from these solutions are homogeneous and transparent. Different drying procedures were investigated in order to optimize powder morphology. Thermoanalytic methods and high -temperature x-ray diffraction were used to study the decomposition of xerogels and the formation of crystal phases, respectively. The calcination process was found to be complete at temperatures well below 750 °C.For the production of barium-containing powders, wet milling must be avoided because this washes out barium and thus causes undesired phases to appear. A dry milling step of the xerogel solves this problem. The prepared (ZrTiSn)O2 and Ba(TiNiZnTa)O3 already equal or surpass the quality of conventionally prepared ceramics.

Ferroelectric Thin Films by sol-gel Processing

1989 ◽  
Vol 152 ◽  
Author(s):  
S. L. Swartz ◽  
P. J. Melling ◽  
C. S. Grant
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Sol Gel ◽  
Fused Silica ◽  
Ferroelectric Materials ◽  
Ferroelectric Thin Films ◽  
Silicon Substrates ◽  
Heat Treated ◽  
Pzt Films ◽  
Gel Processing

ABSTRACTThe sol-gel processing of ferroelectric thin films is being investigated at Battelle. The ferroelectric materials included in this study are PbTiO3, Pb(Zr, Ti)O3 (PZT), and KNbO3. The sol-gel processing and crystallization of these films on fused silica, silicon, alumina, and single crystal SrTiO3 substrates is described.Sol-gel derived PbTiO3 thin films crystallized into the expected tetragonal perovskite structure when heated to 500 C and above. However, the crystallization of sol-gel PZT (20/80) thin films was found to be substratedependent. The heat-treated PZT films were amorphous when deposited on silica and silicon substrates. Crystalline perovskite PZT films were produced on alumina substrates, and epitaxial PZT films were produced on single-crystal SrTiO3. Heat treatment of sol-gel KNbO3 films on silicon and alumina substrates resulted in the crystallization of a variety of non-perovskite phases, but epitaxial growth of KNbO3 was observed on single crystal SrTiO3.

Medical Materials for the Next Millennium

MRS Bulletin ◽  
1999 ◽  
Vol 24 (5) ◽  
pp. 13-20 ◽  
Author(s):  
Larry L. Hench
Keyword(s):  
Sol Gel ◽  
Area Under The Curve ◽  
Dielectric Materials ◽  
Connective Tissues ◽  
Waste Products ◽  
Materials Research ◽  
Medical Materials ◽  
Probability Of Fracture ◽  
Gel Processing

The following article is an edited transcript of the Von Hippel Award address, given by recipient Larry L. Hench at the 1998 MRS Fall Meeting on December 3, 1998. Hench received the Materials Research Society's highest honor for “pioneering accomplishments in the field of glass and ceramics, including the demonstration of the first bioactive glass called Bioglass® and subsequent expansion of the field, demonstration of the feasibility of encapsulating nuclear waste products in glass/ceramic matrices, and development of sol-gel processing to produce ultrahigh-purity optical and dielectric materials with controlled microstructures.”The problem our Society faces as we head into the next millennium is that our average age expectancy has increased to a very attractive number of years but our bodies begin to deteriorate long before then. With the use of antiseptics, anti-biotics, and vaccinations during this Century, we have increased our survival rate considerably, as shown in Figure 1. The average age expectancy has increased to the mid-70s for many countries. However, as we pass the age of 30, our bodies begin to deteriorate. The quality of our connective tissues, particularly our skeletal tissues that hold us upright, begins to decline. The volume of bone that Supports us decreases with time, and for at least some of us, the weight our bones have to bear increases with time. The net effect is that the strength of bone degrades with age, causing the probability of fracture to increase (Figure 2). lf we integrate the area under the curve in Figure 1 from 60 years onward to 90 years, multiply it by the couple of billion people on earth, and then multiply that by the fraction of people subject to bone failure (Figure 2), we have a catastrophic repair problem facing society.

Photoelectric Properties of Undoped and Fe-Doped LiNbO3 Films Made by Sol-Gel Method

1991 ◽  
Vol 243 ◽  
Author(s):  
Chih-Hsing Cheng ◽  
Yuhuan Xu ◽  
John D. Mackenzie
Keyword(s):  
Photovoltaic Effect ◽  
Short Circuit ◽  
Ferroelectric Properties ◽  
Sol Gel ◽  
Fused Silica ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Photoelectric Properties ◽  
Gel Processing

AbstractTransparent lithium niobate (LiNbO3) with thickness from 0.1 - 1.2 μm were made on silicon, fused silica, and sapphire substrates by the sol-gel processing. Alkoxide solutions were used as starting materials. X-ray diffraction has been used to confirm the crystallization of the films. Refractive index, dielectric and ferroelectric properties of LiNbO3 films were studied. Absorption spectra of films of LiNbO3 and LiNbO3 with doping of different amount of Fe (0.1 - 2.5mol%) were measured. Short-circuit photocurrent measurements revealed both transient and steady state components attributed to a pyroelectric effect and a bulk photovoltaic effect respectively. Epitaxial growth of LiNbO3 thin film on sapphire(012) substrate by sol-gel method was also obtained.

A recycling strategy of ion beam removal and recoating of sol-gel film on fused silica surface

Optik ◽  
2021 ◽  
pp. 167259
Author(s):  
Wenfeng Sun ◽  
Xia Xiang ◽  
Bo Li ◽  
Xiang Dong ◽  
Xiaolong Jiang ◽  
...  
Keyword(s):  
Silica Surface ◽  
Ion Beam ◽  
Sol Gel ◽  
Fused Silica ◽  
Gel Film
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