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公开(公告)号：US5538800A
公开(公告)日：1996-07-23
申请号：US315160
申请日：1994-09-29
CPC分类号： H01L43/10 , Y10S428/90 , Y10T428/1107
摘要： Materials of composition La.sub.v X.sub.w M.sub.y Mn.sub.z O.sub.x, with x selected from Mg, Sc, Al, Zn, Cd, In and the rare earths that have an ionic radius smaller than that of La, with M selected from Ca, Sr, Ba and Pb, and with v, w, y, z and x in the ranges 0.45-0.85, 0.01-0.20, 0.20-0.45, 0.7-1.3 and 2.5-3.5, respectively, can have substantially improved magnetoresistance (MR) ratios, as compared to the corresponding X-free comparison material. In particular, the novel materials in polycrystalline (or non-epitaxial thin film) form can have relatively large MR ratios. For instance, polycrystalline La.sub.0.60 Y.sub.0.07 Ca.sub.0.33 MnO.sub.x had a peak MR ratio in excess of 10,000% (in absolute value) in a field of 6 T.
摘要翻译： 组成材料LavXwMyMnzOx，x选自Mg，Sc，Al，Zn，Cd，In以及离子半径小于La的稀土，M选自Ca，Sr，Ba和Pb，以及v 分别为0.45-0.85,0.01-0.20,0.20-0.45,0.7-1.3和2.5-3.5的范围内的w，y，z和x可以具有基本上改善的磁阻（MR）比， 免费比较材料。 特别地，多晶（或非外延薄膜）形式的新型材料可以具有相对大的MR比。 例如，多晶La0.60Y0.07Ca0.33MnOx在6T的场中具有超过10,000％（绝对值）的峰值MR比。
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公开(公告)号：US5006504A
公开(公告)日：1991-04-09
申请号：US399649
申请日：1989-08-28
CPC分类号： H01L39/2419 , B01D19/04 , B01D19/0404 , C01G3/006 , C04B35/4508 , C01P2002/72 , C01P2004/61 , Y10S505/739 , Y10S505/78
摘要： A process for the preparation of superconducting ceramic materials by a solid state reaction technique. The process is especially suited for production of powders including .gtoreq.95% of Ba.sub.2 YCu.sub.3 O.sub.7 for use in producing sintered ceramic bodies including >99% Ba.sub.2 YCu.sub.3 O.sub.7. The process includes the steps of (a) wet milling raw powders of starting ingredients, including oxides and/or carbonates or the respective ions, to form a milled slurry, (b) separating particulate solids from the liquids of the slurry, the separating including continuously agitating the mixed slurry so as to avoid segregation of the milled ingredients and spray drying the milled slurry to produce spray dryed particles, (c) calcining the separated particles in oxygen to form calcined powder, (d) optionally remilling the calcined powder, (e) forming the calcined powder into a suitable form body and (f) sintering the formed body in oxygen; preferably said separating step including spray drying the agitated, milled slurry. The above process results in calcined material including .gtoreq.95% of a single phase material (Ba.sub.2 YCu.sub.3 O.sub.7) and a small amount e.g. 3%, of a single second phase material and leads to a sintered ceramic which is .gtoreq.99% single phase material.
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公开(公告)号：US5389428A
公开(公告)日：1995-02-14
申请号：US987515
申请日：1992-12-08
申请人： Debra A. Fleming , Gideon S. Grader , David W. Johnson, Jr. , Henry M. O'Bryan, Jr. , Warren W. Rhodes
发明人： Debra A. Fleming , Gideon S. Grader , David W. Johnson, Jr. , Henry M. O'Bryan, Jr. , Warren W. Rhodes
IPC分类号： C04B35/622 , C04B35/26 , C04B41/87 , H01F17/00 , H01F17/04 , H01F27/02 , H01F41/16 , H01G4/12 , H01F41/02
CPC分类号： H01F17/0033 , H01F17/0013 , H01F17/04 , H01F27/027 , H01F41/16 , H01F2017/048 , Y10S428/90 , Y10T428/24917
摘要： This invention is predicated upon applicants' discovery that conventional techniques for minimizing metal loss from sintered ceramic materials are not adequate in the fabrication of small ceramic components such as multilayer monolithic magnetic devices wherein a magnetic core is substantially surrounded by an insulating housing. Applicants have determined that this metal loss problem can be solved by providing the component with a housing layer having an appropriate concentration of metal. Specifically, if the insulating housing material around the magnetic core has, during the high temperature firing, the same partial pressure of metal as the magnetic core material, there is no net loss of metal from the core. In a preferred embodiment, loss of zinc from a MnZn ferrite core is compensated by providing a housing of NiZn ferrite or zinc aluminate with appropriate Zn concentrations. Similar considerations apply to other ceramic components.
摘要翻译： 本发明基于申请人的发现，用于最小化烧结陶瓷材料的金属损耗的常规技术在制造小型陶瓷部件如多层单片磁性器件中是不够的，其中磁芯基本上被绝缘壳体包围。 申请人已经确定，通过为组件提供具有适当浓度金属的容纳层，可以解决该金属损失问题。 具体来说，如果磁芯周围的绝缘壳体材料在高温烧成时具有与磁心材料相同的金属分压，则不存在来自芯的金属的净损耗。 在优选的实施方案中，通过提供具有合适的Zn浓度的NiZn铁氧体或铝酸锌的壳体来补偿来自MnZn铁氧体磁心的锌的损失。 类似的考虑也适用于其他陶瓷组件。
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公开(公告)号：US4318995A
公开(公告)日：1982-03-09
申请号：US144172
申请日：1980-04-25
申请人： Warren W. Rhodes , Man F. Yan
发明人： Warren W. Rhodes , Man F. Yan
摘要： A method of preparing lightly doped ceramic materials which forms a slurry of the ceramic material with additives in solution, precipitates the additives and spray dries the slurry with the additive precipitates is described.
摘要翻译： 描述了一种制备轻掺杂陶瓷材料的方法，其形成陶瓷材料与溶液中的添加剂的浆料，沉淀添加剂并用添加剂沉淀物喷雾干燥浆料。
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公开(公告)号：US5239744A
公开(公告)日：1993-08-31
申请号：US818669
申请日：1992-01-09
CPC分类号： H01F41/16 , B28B1/48 , B28B7/342 , Y10T29/4902 , Y10T29/49833
摘要： Multilayer magnetic components can be made with reduced cracking and magnetic degradation by forming layers having patterns of magnetic and insulating regions separated by regions that are removable during sintering. Advantageously, when the layers are stacked, layers of removable material are also disposed between magnetic regions and insulating regions so as to produce upon sintering a magnetic core within an insulating body wherein the core is substantially completely surrounded by a thin layer of free space.
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公开(公告)号：US4637989A
公开(公告)日：1987-01-20
申请号：US717814
申请日：1985-03-29
申请人： Hung C. Ling , Warren W. Rhodes , Man F. Yan
发明人： Hung C. Ling , Warren W. Rhodes , Man F. Yan
IPC分类号： C04B35/497 , C04B35/00
CPC分类号： C04B35/497
摘要： A predominantly perovskite phase Pb(Zn.sub.x Mg.sub.1-x Nb.sub.2).sub.1/3 O.sub.3 ceramic is prepared by first forming a columbite precursor having the formula Zn.sub.x Mg.sub.1-x Nb.sub.2 O.sub.6 and reacting this material with PbO at temperatures of from 800.degree. C. to at least 1000.degree. C. as x varies from 0.025 to 0.7.
摘要翻译： 通过首先形成具有式Zn x Mg 1-x N b O 6 6的铌酸盐前体，并将该材料与PbO在800℃至至少1000℃的温度下反应制备主要为钙钛矿相Pb（Zn x Mg 1-x Nb 2）1 / x从0.025变化到0.7。
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