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    • 1. 发明授权
    • Dielectric ceramic compositions
    • 介电陶瓷组合物
    • US4751209A
    • 1988-06-14
    • US917673
    • 1986-10-10
    • Yoichirou YokotaniJunichi KatoHiromu Ouchi
    • Yoichirou YokotaniJunichi KatoHiromu Ouchi
    • C04B35/499H01G4/12C04B35/46
    • H01G4/1263C04B35/499
    • Dielectric ceramic composition consisting essentially of substance selected from those represented by the following formulas:(1) Pb.sub.a (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a(2) Pb.sub.a Ca.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b(3) Pb.sub.a Ba.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+b(4) Pb.sub.a Sr.sub.b (Mg.sub.1/3 Nb.sub.2/3).sub.x Ti.sub.y (Ni.sub.1/2 W.sub.1/2).sub.z O.sub.2+a+bwherein x+y+z=1.00, and a or a+b.gtoreq.1.001.These compositions can be sintered below 1080.degree. C. in low partial pressure of oxygen of about 1.times.10.sup.-8, and exhibit a high dielectric constant and a high electrical resistivity.
    • 介电陶瓷组合物,主要由选自下式表示的物质组成:(1)Pba(Mg1 / 3Nb2 / 3)xTiy(Ni1 / 2W1 / 2)zO2 + a(2)PbaCab(Mg1 / 3Nb2 / 3)xTiy (Ni1 / 2W1 / 2)zO2 + a + b(3)PbaBab(Mg1 / 3Nb2 / 3)xTiy(Ni1 / 2W1 / 2)zO2 + a + b(4)PbaSrb(Mg1 / 3Nb2 / 3)xTiy / 2W1 / 2)zO2 + a + b其中x + y + z = 1.00,a或a + b> / = 1.001。 这些组合物可以在低于1080℃的约1×10 -8的低分压下烧结,并且表现出高介电常数和高电阻率。
    • 7. 发明授权
    • Method of preparing ferroelectric ceramics
    • 制备铁电陶瓷的方法
    • US3963631A
    • 1976-06-15
    • US546780
    • 1975-02-03
    • Hiromu OuchiMasamitsu NishidaKazunori Numata
    • Hiromu OuchiMasamitsu NishidaKazunori Numata
    • C04B35/49C04B35/46C04B35/48C04B35/493C04B35/50C04B35/51H01L41/187H01L41/39
    • C04B35/50C04B35/46C04B35/48C04B35/51
    • A process for preparing strengthened ferroelectric ceramics, which comprises sintering ceramic materials and then heat treating the sintered ceramics at a temperature from about 100.degree. to about 400.degree.C lower than the final sintering temperature of ceramics, for about 1 to about 60 hrs., and then cooling at a rate from about 300.degree. to about 10.degree.C per hour. Strengthened ferroelectric ceramics are obtained among the following ferroelectric ceramic compositions:I. pb([B.sub.1 ].sub.A Ta.sub.1.sub.-A)O.sub.3 --PbTiO.sub.3 --PbZrO.sub.3, where [B.sub.1 ] is Mg, Zn, Cd, Sn, Mn, Fe, Co, and Ni when A=1/3 and [B.sub.1 ] is Li and Cu when A=1/4,Ii. pb([B.sub.2 ].sub.B Ta.sub.1.sub.-B)O.sub.3 --Pb([B.sub.3 ].sub.C Ta.sub.1.sub.-C)O.sub.3 -PbTiO.sub.3 -PbZrO.sub.3, where [B.sub.2 ] and [B.sub.3 ], [B.sub.2 ].noteq.[B.sub.3 ], are Mg, Zn, Cd, Sn, Mn, Fe, Co and Ni when B and C=1/3, and [B.sub.2 ] and [B.sub.3 ], [B.sub.2 .noteq.[B.sub.3 ], are Li and Cu when B and C=1/4,Iii. pb([B.sub.1 ].sub.A Ta.sub.1.sub.-A)O.sub.3 PbTiO.sub.3 --PbZrO.sub.3 with MnO.sub.2, where [B.sub.1 ] is Mg, Zn, Cd, Sn, Fe, Co and Ni when A=1/3, and [B.sub.1 ] is Li and Cu when A=1/4, andIv. pb([B.sub.2 ].sub.B Ta.sub.1.sub.-B)O.sub.3 --Pb([B.sub.3 ].sub.C Ta.sub.1.sub.-C)O.sub.3 --PbTiO.sub.3 --PbZrO.sub.3 with MnO.sub.2, where [B.sub.2 ] and [B.sub.3 ], [B.sub.2 ].noteq. [B.sub.3 ], are Mg, Zn, Cd, Sn, Fe, Co and Ni when B and C=1/3, and [B.sub.2 ] and [B.sub.3 ], [B.sub.2 ].noteq.[B.sub.3 ], are Li and Cu when B and C=1/4.
    • 一种制备强化铁电陶瓷的方法,包括烧结陶瓷材料,然后在比陶瓷的最终烧结温度低约100至约400℃的温度下对烧结陶瓷进行热处理约1至约60小时, 然后以约300至约10℃/小时的速率冷却。 在以下铁电陶瓷组合物中获得强化铁电陶瓷: