Neodymium titanate and barium neodymium titanate, processes for

Details Neodymium titanate and barium neodymium titanate, processes for Neodymium titanate and barium neodymium titanate, processes for

1986-03-03

1988-07-12

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501139, 501152, 501135, 501136, 423598, 423263, C01G 2300, C01F 1700, C04B 3546

Patent

active

047570377

ABSTRACT:
A fine powder of neodymium titanate or barium neodymium titanate, a process for its preparation and applications in ceramic compositions. A suspension of particles is formed by mixing a solution of neodymium nitrate or a solution of barium and neodymium nitrates with a sol of titania having a pH of from about 0.8 to 2.5 which contains elementary crystallites of TiO.sub.2 having a size of from about 10 to about 100 .ANG. in diameter which are agglomerated into submicron masses of from about 200 to about 1,000 .ANG. in diameter. The suspension obtained is dried, and the dried product is calcined at a temperature between 800.degree. C. and 1,300.degree. C., preferably for about 1 to 24 hours. If necessary, the powder obtained is milled. The fine powder obtained has a low fritting temperature and its density after heating for 2 hours at 1,300.degree. C. is greater than or equal to 95% of the theoretical density of the desired titanate powder.

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"The Condensed Chem. Dic." 10th Ed. pp. 956 and 958.
Chemical Abstracts, vol. 75, No. 6, pp. 579-580 (1971), No. 44339v.
Ber. Dt. Keram, Ges. 55 (1978) (No. 7).

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