摘要:
A perovskite type superconductor film having a high content, almost a single phase, of high Tc phase, is formed by the steps of: depositing at least one first film of a first material (e.g., a composite oxide of Bi-Sr-Ca-Cu-O system or Tl-Ba-Ca-Cu-O system) constituting a perovskite type superconductor over a substrate; depositing at least one second film of a second material containing an oxide or element (Bi₂O₃ , Tl₂O₃ , PbO x , etc., particularly PbO x ) having a vapor pressure of more than 10 ⁻⁴Pa at 800°C at least as a main component over the substrate; to thereby form a stack of the first and second films; and heat treating the stack of the first and second films to form the perovskite type superconductor film on the substrate.
摘要翻译:通过以下步骤形成具有高含量,几乎单相的高Tc相的钙钛矿型超导体膜:沉积至少一种第一材料的第一膜(例如,Bi-Sr-Ca- Cu-O系或Tl-Ba-Ca-Cu-O系),在基板上构成钙钛矿型超导体; 在800℃下至少沉积至少一个第二材料的第二材料的第二材料,所述第二材料含有氧化物或元素(Bi 2 O 3,Tl 2 O 3,PbO x等,特别是PbO x),其蒸气压大于10 -4 Pa 基材上的主要成分; 从而形成第一和第二膜的堆叠; 并对第一和第二膜的堆叠进行热处理,以在基板上形成钙钛矿型超导体膜。
摘要:
A coolant for use in cryogenic devices of closed cycle system which comprises a mixture of a liquid nitrogen and a fluorocarbon of the formula: CnF 2n+2 , wherein n is an integer of 2 to 4. The coolant, when used to cool heat generating semiconductor devices and other devices to a cryogenic temperature, exhibits an increased heat flux and thus an increased cooling capability, in addition allows a simple and small structure of the cooling system, and a prevention of environmental pollution.
摘要:
Bi-Pb-Sr-Ca-Cu-O system and Tl-Pb-Ba-Ca-Cu-O system superconductor having a high Tc phase (about 110 K and about 125 K, respectively, or more) in a high proportion are obtained by adding a calcium compound which forms CaO and a liquid phase at a temperature for firing the superconductors, e.g., Ca₂PbO x (x = 3 or 4); or by starting from a composition represented by the formula: Bi₂Pb (n-1)/2 Sr₂Ca n Cu n+1 O b′ , or Tℓ₂Pb (n-1)/2 Ba₂Ca n Cu n+1 O b where 2 ≦ n ≦ 10, 9 ≦ b ≦ 40.5, i.e., at a ratio of Ca:Pb = 2:1.
摘要:
A process for producing a multilayer ceramic circuit board with copper comprising the steps of: forming green sheets by doctoring a slurry which comprises 100 parts by weight of glass ceramic particles, 5 to 20 parts by weight of a thermally depolymerizable resin binder, 2 to 10 parts by weight of a plasticizer, and up to 2 parts by weight of a fatty acid ethylene oxide adduct type defloculant, the glass ceramic comprising 20 to 70% by weight of alumina, and 30 to 80% by weight of Si0 2 -B 2 0 3 glass, forming via holes through the green sheets, screen-printing a copper paste on the green sheets and laminating the green sheets, thereby forming a multilayer structure and firing the multilayer structure in a non-oxidizable atmosphere.
摘要:
A multilayer circuit board (10) on which semiconductor devices are mounted, consists of conductor layers (6. 60, 61, 82, 63) made of a metal e.g. Gold, Silver, Copper or an alloy thereof, insulating material (2, 7) preferably made of glass-ceramic surrounding the conductors, and an insulating plate (1) sandwiched between the insulated conductors. The glass-ceramic preferably comprises borosilicate glass and alumina and has a low dielectric constant and a thermal expansion coefficient approaching that of the semi-conductor devices. The insulating plate (1) has a higher dielectric constant and thermal conductivity than the insulating material (2, 7) and is preferably made of sintered aiumina.
摘要:
A paste for forming a superconducting ceramic film comprises a powder of a superconducting ceramic material or powders of ingredients which form a superconductive ceramic material by firing, an organic binder and a solvent. The paste is to be utilized in producing a multi-layer superconducting circuit substrate formed of a plurality of insulating layers laminated together and having holes penetrated through the layers with interconnection layers of the superconductive ceramic material being located between the insulating layers and the through holes in the insulating layers being filled with superconductive ceramic material electrically connecting the interconnection layers. The superconductive ceramic material is preferably isolated from the insulating layers by noble metal layers encapsulating the superconductive ceramic material. The superconductive ceramic material itself is either an oxide ceramic material represented by one of the general formulae X a Y 1-a ZO b and (X 1-a Y a ) 2 ZO b , where O