Preparation of lithium tantalate thin films by wet process and its application to a moisture-sensitive device

Imoto, Fumio; Nanataki, Tsutomu; Shiozaki, Katsuyuki; Iwamoto, Hitoshi; Yamamoto, Takuya

doi:10.1016/0267-3762(88)90092-6

Cited by 2 publications

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“…In these methods, relatively large, uniform, and spherical particles were, in general, obtained by spray drying. Pure and size-controlled oxide powders were formed by drying and subsequently calcining the rare earth hydroxides obtained by hydrolysis of the isopropoxides …”

Section: G Fine Particles By Other Methodsmentioning

confidence: 99%

The Binary Rare Earth Oxides

1998

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Section: G Fine Particles By Other Methodsmentioning

confidence: 99%

The Binary Rare Earth Oxides

1998

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“…Fine particles of cerium oxide with very small size have great potential to become new materials that are useful for fine UV absorbent and high-activity catalysts. Many workers have prepared them using various methods such as inert gas condensation of Ce metal (matrix isolation) followed by oxidation by O 2 gas, hydrolysis of cerium isopropoxide (alkoxide process), process of homogeneous precipitation using urea or hexamethylenetetramine, forced hydrolysis of cerium salts in the presence of diluted sulfuric acid, hydrothermal synthesis technique, − and electrochemical synthesis . In these references, some of the properties such as sinterability of the particles, thermal stability of specific surface area, and catalytic properties have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Cerium(IV) Oxide Ultrafine Particles Prepared Using Reversed Micelles

Masui¹,

Fujiwara²,

Machida³

et al. 1997

Chem. Mater.

469

292

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Cerium(IV) oxide ultrafine particles were prepared using a reaction within reversed micelles, which was known as a microemulsion method. The ultrafine particles, which were obtained by mixing the water-in-oil microemulsions containing cerium nitrate solution with those of ammonium hydroxide, were characterized by high-resolution electron microscope (HREM) observations. HREM micrographs revealed that nanometer-sized CeO 2 particles were formed, and their shapes were uniform. Selected-area electron diffraction patterns of the particles were completely indexed as those of cerium(IV) oxide with the cubic fluorite structure, and the lattice constant calculated from radii of Debye-Sherrer rings was 0.541 nm. Most of the particles were distributed between 2 and 6 nm, and the mean particle size obtained in this method was between 2.6 and 4.1 nm. The size of 2.6 nm is the smallest among the values ever reported for CeO 2 particles. Both direct and indirect optical energy gaps of the particles were independent of the mean particle size, and their values were almost the same as that of the bulk material, suggesting that there was no quantum size effect of the CeO 2 ultrafine particles. However, the alumina-supported ultrafine CeO 2 catalysts prepared by a microemulsion method showed much higher CO oxidation activities than those prepared by a coprecipitation method.

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Preparation of lithium tantalate thin films by wet process and its application to a moisture-sensitive device

Cited by 2 publications

References 0 publications

The Binary Rare Earth Oxides

The Binary Rare Earth Oxides

Characterization of Cerium(IV) Oxide Ultrafine Particles Prepared Using Reversed Micelles

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