Bismuth pyrochlore microwave dielectric materials
    1.
    发明授权
    Bismuth pyrochlore microwave dielectric materials 失效
    铋烧绿石微波介电材料

    公开(公告)号:US06680269B2

    公开(公告)日:2004-01-20

    申请号:US09892364

    申请日:2001-06-27

    IPC分类号: C04B35495

    CPC分类号: C04B35/495 H01B3/12

    摘要: The disclosed invention relates to Bi2O3—ZnO—Ta2O5 dielectric compounds and compositions, and to their manufacture. The compounds of the invention have outstanding K, Q, TCF, and TCC. Examples of these properties include a K of between 58 and 80, a low dielectric loss (tan &dgr;

    摘要翻译: 所公开的发明涉及Bi2O3-ZnO-Ta2O5介电化合物和组合物及其制造。 本发明化合物具有优异的K,Q,TCF和TCC。 这些性质的实例包括58至80之间的K,低介电损耗(tanδ<0.003)和TCC <30ppm /℃。所生产的陶瓷组合物包括由Bi2(ZnTa2)xO6x + 3表示的组成,其中0.57 <= X&LE; 1.0,BI2(ZnTay)2 / 3O((5y + 11)/ 3)其中1.0 <= y <= 3.0,以及Bi2(ZnTay)2 / 3O((5y + 11)/ 3 ),其中1.0 <= y <= 3.0,条件是y不为2.0。 由式r(Bi2(Zn1 / 3Ta2 / 3)2O7) - (1-r)(Bi3 / 2Zn2 / 3)(Zn1 / 2Ta3 / 2)O7))定义的化合物的固溶体,其中0

    (Bi, Pb).sub.2, Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x superconductor and
method of making same utilizing sinter-forging
    9.
    发明授权
    (Bi, Pb).sub.2, Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x superconductor and method of making same utilizing sinter-forging 失效
    (Bi,Pb)2,Sr2Ca2Cu3Ox超导体及其使用烧结锻造的方法

    公开(公告)号:US5821201A

    公开(公告)日:1998-10-13

    申请号:US748259

    申请日:1996-11-13

    摘要: A (BiPb).sub.2 Sr.sub.2 Ca.sub.2 Cu.sub.3 O.sub.x (Bi223) superconductor with high J.sub.c, phase purity, density and mechanical strength is formed from Bi2223 powder which is synthesized from a mixture of Bi.sub.2 O.sub.3, PbO, SrCO.sub.3, CaCo.sub.3 and CuO. The mixture is milled, then dried and calcined to synthesize the Bi2223 powder with the desired phase purity. The calcination is performed by heating the dried mixture for 50 hours at 840.degree. C. The partially synthesized powder is then milled for 1-4 hours before calcining further for another 50 hours at 855.degree. C. to complete the synthesis. After calcination, the Bi2223 powder is cold pressed to a predetermined density and sinter forged under controlled temperature and time to form a Bi2223 superconductor with the desired superconducting properties.

    摘要翻译: 由Bi2O3,PbO,SrCO3,CaCo3和CuO的混合物合成的Bi2223粉末形成具有高Jc,相纯度,密度和机械强度的(BiPb)2Sr2Ca2Cu3Ox(Bi223)超导体。 将混合物研磨,然后干燥并煅烧以合成具有所需相纯度的Bi2223粉末。 煅烧通过在840℃加热干燥的混合物50小时进行。然后将部分合成的粉末研磨1-4小时,然后在855℃下进一步煅烧另外50小时以完成合成。 煅烧后,将Bi2223粉末冷压至预定的密度,并在受控的温度和时间下烧结锻造以形成具有所需超导性能的Bi2223超导体。