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Citrate Route to Sn-Doped BaTi4O9 with Microwave Dielectric Properties (1998)

Choy, Jin-Ho ; Han, Yang-Su ; Hwang, Sung-Ho ; [et al.]

Westerville, Ohio : American Ceramics Society

Journal of the American Ceramic Society 81 (1998), S. 0

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ISSN: 1551-2916

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Highly reactive and nanometer-sized (30–50 nm) Sn-doped BaTi4O9 (BaTi4-xSnxO9; x = 0.0–0.03) powders have been prepared by the citrate-precursor method. The effect of Sn substitution on the crystallization and microwave dielectric properties has also been investigated on the basis of microstructure and crystal structure. Addition of a small amount of SnO2 resulted in a lowering of the sintering temperature of BaTi4O9, and at 1250–1300°C for 2–5 h, dense compounds with a theoretical density up to 99% could be obtained. The Sn-doped BaTi4O9 materials were found to have excellent microwave dielectric properties with epsilonr = 34–37, Q = 8300–8900 at 11 GHz and tauf = 3.6–16.1 ppm/°C.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1151-2916.1998.tb02756.x

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Preparation and Adsorption Properties of Mesoporous Pillared Clays with Silica Sol (1998)

Han, Yang-Su ; Yamanaka, Shoji

Springer

Journal of porous materials 5 (1998), S. 111-119

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ISSN: 1573-4854

Keywords: pillared clays ; intercalation ; microporosity ; mesoporosity ; organic template

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract New mesoporous silica-pillared montmorillonites were prepared by the post-intercalation of bulky organic cations into silica sol exchanged montmorillonites. Pillared clays with SiO2-Fe2O3 sol were first prepared, followed by the dissolution of iron oxide (or hydroxide) from the pillars with hydrochloric acid. A portion of the interlayered sol particles were then replaced with organic cations which led to a rearrangement of silica sol particles between the silicate layers. The removal of the organics by burning resulted in mesoporous sol pillared clays with an average pore size of more than 20 Å in diameter. The BET specific surface area increased to as high as 950 m2/g in these mesoporous pillared clays.