Thermionic emitter of lanthanum strontium vanadates
AssigneeCanadian Patents and Development Limited
InventorMichael Sayer
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Abstract
A thermionic emitter for apparatus such as electron microscopes, scanning electron microscopes, and high power vacuum tubes which require a source of electrons formed from lanthanum strontium vanadate which is prepared from the compounds La.sub.(1.sub.-x) Sr.sub.(x) VO.sub.3, where x is the fraction of strontium (Sr) incorporated into LaVO.sub.3. The value of x lies between 0.1 and 0.4.
Claims1
A thermionic emitter for electron beam apparatus comprising a metallic, electrically conducting support structure and a shaped piece of electron emitting material mounted on and in electrical contact with the said support structure, said material being the compound lanthanun strontium vanadate having the formula La.sub.(1.sub.-x) Sr.sub.x VO.sub.3 where x is the fraction of strontium (Sr) incorporated in the La VO.sub.3 and with x lying between 0.01 and 0.4.
Dependencies are inferred from the claim text.