{"id":25052,"date":"2026-08-26T18:53:19","date_gmt":"2026-08-26T16:53:19","guid":{"rendered":"https:\/\/delta.screenup.com\/produit\/kimball-physics-lanthanum-hexaboride-lab6-filaments-cathodes-4\/"},"modified":"2026-08-26T18:53:19","modified_gmt":"2026-08-26T16:53:19","slug":"kimball-physics-lanthanum-hexaboride-lab6-filaments-cathodes-4","status":"publish","type":"product","link":"https:\/\/delta.screenup.com\/en\/produit\/kimball-physics-lanthanum-hexaboride-lab6-filaments-cathodes-4\/","title":{"rendered":"Kimball Physics Lanthanum Hexaboride (LaB6) Filaments \/ Cathodes"},"content":{"rendered":"\nFor Use in<\/strong>_x000D_\n– Scanning Electron Microscopes\"\"<\/a>_x000D_\n– Transmission Electron Microscopes_x000D_\n– Electronlithography Systems_x000D_\n– X-Ray Sources_x000D_\n_x000D_\nThe new improved Kimball Physics Model ES-423E (Extended Life) LaB6 Cathode is a high performance, resistively heated, thermionic electron source. The improvement stability of the LaB6 crystal, results in less exposure of LaB6, which reduces Wehnelt aperture contamination._x000D_\nIts lifetime is in excess of 6 months with continuous operation. Continuous operation at the full operating temperature improves the thermal stability of the gun and hence beam current stability. It is no longer necessary to wait hours for stable beam conditions in order to perform quantitative EEL or EDX measurements._x000D_\n_x000D_\nSpecifications<\/strong>_x000D_\nThe emitter is machined to 15+\/-2\u00b5m diameter (standard), microflat alignment to the instrument base can be provided (on request), oriented-single-crystal, <100> surface._x000D_\nMounted on the end of a single-piece, stress-free, carbon heater rod, held in place by a carbon ferrule._x000D_\nA high degree of axial symmetry provides great mechanical stability._x000D_\nThe rod has a 100\u00b5m slot along the axis, which allows the heating current to go up one side and down the other._x000D_\nIn SEM type instruments, its lifetime is up to 3000 – 4000 hours In TEM instruments the lifetime can be even longer._x000D_\nMounting structure will last more than 10,000 hours._x000D_\nChemical reactivity and mechanical drift problems have been eliminated._x000D_\n_x000D_\nInstrument Conditions<\/strong>_x000D_\nWhile the cathodes can be fitted to virtually any instrument, there are several requirements needed for achieving quality results._x000D_\nThe most important requirement is for clean vacuum, with partial pressures of oxidizing gases being kept below 10-7 torr in the electron gun. The condition of the cathode itself, along with that of the Wehnelt aperture, may often be used to verify the partial pressures in the gun._x000D_\nThe cathode must be accurately and correctly positioned behind the Wehnelt aperture._x000D_\nThere must be controlable bias resistors which can reach adequately high values; some instruments are limited by values which are to low._x000D_\n_x000D_\nOrdering Information<\/strong>_x000D_\nFor most SEM’s and TEM’s, the standard Styles 90-15 (90\u00b0 included angle with a 15*m flat) is recommended._x000D_\n– Style 90-15 (90\u00b0 included angle with a 15*m flat) is recommended for Leica\/Cambridge._x000D_\n– Style 90-06 (90\u00b0 included angle with a 6*m flat) is for high resolution, and selective TEM’s. This cathode provides higher brightness, but with some compromise in lifetime._x000D_\n_x000D_\nTo Order<\/strong>_x000D_\n
    _x000D_\n \t
  1. Specify Model: Model ES-423E & Style_x000D_\ni.e. Style 90-15 : Standard Microflat_x000D_\nStyle 90-20 : Standard for Leica, Cambridge_x000D_\nStyle 90-20 : 90\u00b0 Angle w\/non-standard microflat_x000D_\nStyle 60-06 : 60\u00b0 Angle w\/non-standard microflat<\/li>_x000D_\n \t
  2. Specify Instrument Manufacturer and Model No.<\/li>_x000D_\n \t
  3. Specify Type of Instrument: SEM, TEM, STEM.<\/li>_x000D_\n<\/ol>\n","protected":false},"excerpt":{"rendered":"

    Featuring_x000D_
    \n– Extended Life \u2013 Thousands of Hours in Clean Vacuum. Guaranteed Life (Measured in Surface Loss). Guaranteed Against Mounting Structure Failure._x000D_
    \n– Exceptional Stability \u2013 Thermal\/Chemical\/Electrical. Precision Machined Carbon Mounting. High over-temperature Tolerance._x000D_
    \n– High Brightness\/Low Energy Spread \u2013 Oriented Single Crystal. Best-Quality\/High-Purity Material._x000D_
    \n– Accurate Microflats \u2013 Superior Optics\/Controlled Source Size Standard Diameter Available._x000D_
    \n_x000D_
    \n    brochures_Cathodes.pdf<\/a>_x000D_
    \n_x000D_
    \n    TDS_Aperture Flamer Instructions<\/a><\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false,"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"","_seopress_redirections_param":"","_seopress_redirections_type":0,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[]},"product_brand":[],"product_cat":[1702,1717,1716],"product_tag":[],"class_list":["post-25052","product","type-product","status-publish","product_cat-accessoires-microscope","product_cat-cathodes","product_cat-filaments-cathodes","first","instock","taxable","shipping-taxable","purchasable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/delta.screenup.com\/en\/wp-json\/wp\/v2\/product\/25052","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/delta.screenup.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/delta.screenup.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/delta.screenup.com\/en\/wp-json\/wp\/v2\/media?parent=25052"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/delta.screenup.com\/en\/wp-json\/wp\/v2\/product_brand?post=25052"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/delta.screenup.com\/en\/wp-json\/wp\/v2\/product_cat?post=25052"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/delta.screenup.com\/en\/wp-json\/wp\/v2\/product_tag?post=25052"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}