Process for preparing perovskite-type crystalline compound powders
First Claim
1. A process for preparing perovskite-type compound Ax(BO3)y powders, comprising the steps of:
- a) providing a solution containing cation A, a solution containing cation B, and an alkaline solution; and
b) reacting the solution containing cation A and the solution containing cation B with an alkaline solution, under a high-gravity field at a temperature of from about 60°
C. to about 100°
C.;
wherein A is a metal element selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba, Pb, Sm, La, Nd, Bi, and other rare-earth metal elements, and mixtures thereof;
wherein B is a metal element selected from the group consisting of Ti, Zr, Sn, Hf, Nb, Ce, Al, Zn, Mn, Co, Ni, Fe, Cr, Y, Sc, W, Ta, and mixtures thereof;
wherein x and y are numbers which balance the valence; and
provided that compound Ax(BO3)y is not BaTiO3 and SrTiO3.
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Abstract
A process for preparing perovskite-type compound Ax(BO3)y powders involving reacting a solution containing A and a solution containing B, or a combined solution comprising A and B, with an alkaline solution in a high-gravity reactor at a temperature ranging from about 60° C. to about 100° C. A is one or more metal elements selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba, Pb, Sm, La, Nd, Bi, and other rare-earth metal elements. B is one or more metal elements selected from the group consisting of Ti, Zr, Sn, Hf, Nb, Ce, Al, Zn, Mn, Co, Ni, Fe, Cr, Y, Sc, W, Ta, and the like. The resulting mixture is then filtered, rinsed and dried to obtain the desired powders. The obtained perovskite-type compound Ax(BO3)y powders have a small average particle size with a narrow particle size distribution, a perfect crystal form and a uniform particle shape, and is suitable for use as raw material for making dielectric, piezoelectric, anti-ferroelectric, pyroelectric, pressure-resisting, sensing, microwave media, and other ceramics.
30 Citations
20 Claims
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1. A process for preparing perovskite-type compound Ax(BO3)y powders, comprising the steps of:
-
a) providing a solution containing cation A, a solution containing cation B, and an alkaline solution; and
b) reacting the solution containing cation A and the solution containing cation B with an alkaline solution, under a high-gravity field at a temperature of from about 60°
C. to about 100°
C.;
wherein A is a metal element selected from the group consisting of Li, Na, K, Mg, Ca, Sr, Ba, Pb, Sm, La, Nd, Bi, and other rare-earth metal elements, and mixtures thereof;
wherein B is a metal element selected from the group consisting of Ti, Zr, Sn, Hf, Nb, Ce, Al, Zn, Mn, Co, Ni, Fe, Cr, Y, Sc, W, Ta, and mixtures thereof;
wherein x and y are numbers which balance the valence; and
provided that compound Ax(BO3)y is not BaTiO3 and SrTiO3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification