Abstract:
Various examples are provided related to electrodes for high temperature electrochemical corrosion sensing. In one example, a high temperature sensor electrode includes a quartz tube; a copper chloride and sodium chloride mixture sealed in the quartz tube; and an electrode wire in the mixture, the electrode wire including an electrode connection extending through a seal of the quartz tube. In another example, a method for electrochemical testing includes immersing electrodes of a high temperature electrochemical sensor in a corrosive medium, the electrodes comprising a high temperature sensor electrode; and obtaining one or more electrochemical measurement via the electrodes immersed in the corrosive medium. The electrodes can also include a working electrode and/or a counter electrode.
Abstract:
An improved cathode comprises a cone-shaped emitter with a carbon-based coating applied to the emitter cone surface, in which there is a narrow annular gap between the emitter body and the carbon coating. The gap prevents direct contact between the carbon coating and the crystalline emitting material, thereby preventing damaging interactions and extending the useful lifetime of the cathode.
Abstract:
An electron gun includes an electron emission cathode, a control electrode, and an extractor and the electron emission cathode is made of rare earth hexaboride. A tip of the electron emission cathode is located between the control electrode and the extractor, and the electron emission surface of the electron emission cathode is spherical or flat.
Abstract:
An electron source using an electron emissive material having a composition represented by the nominal atom formula La.sub.x (Nd.sub.y Pr.sub.1-y).sub.1-x B.sub.6 ; x less than 0.5 and greater than 0.2, y less than or equal to 1.0 and greater than or equal to 0.0, is described. The electron source is well suited for use in instruments such as scanning electron microscopes and electron beam exposure systems.
Abstract:
A thermionic cathode comprising a thermionic emissive material consisting essentially of a metal boride, a support consisting essentially of a refractory metal which is reactive with the metal boride and a brazing material bonding the metal boride to the support and acting as a barrier to prevent reaction therebetween.