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北京石油化工学院2026年研究生招生接收调剂公告
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xiaohui8882

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[交流] 【请教】谢问哪位能解释一下场发射特性?

看到有很多人对材料进行场发射(field-emission)的测试,这是测试材料什么性质的? 其中提到的发射电流强度(emission current density)开启电压(turn on field)阈场电压(threshod field),都有什么意义呢?什么样的材料适宜做场发射测试?谢谢!
[search]场发射[/search]

[ Last edited by xiaohui8882 on 2008-10-8 at 16:13 ]
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江南豪情(金币+1,VIP+0):谢谢交流
xiaohui8882(金币+1,VIP+0):并没有我要的答案啊~不过还是非常感谢!
???????????????????
???l????????t???u???z???????|???z?????????e??? 10 - 100 ??????r?????????уH?? 0.2 - 0.3 eV???????????????????????????@??R????????l???????????????????_ 1nm ?????

10. ???l???????????????N:????l???(cold field emission , FE)??????l???(thermal field emission ,TF)????????l???(Schottky emission ,SE)

11. ????????е??????????108V/cm??С???????????r?????п??^?????????l??????????^????????l??????????????????λ??K?a??SchottkyЧ???????????????????????????????????"????"??^??M??????K?x?_?O?????l?????S?????J???O??????l????????????O??????????????????????????????_?????x???????????????????????

12. ???l?????????x????O?????????????????????????????????T???O?????Cе???????u??????????????^????O????????l?????????????M?O???a?????????????????????????????????O?????????????a?????o??????????a?????Ч??????????????????????O?????(??)?O??????????l????????(extraction voltage)???????????l????????????????(??)?O?????Q??????????????????????????????????

13. ???O?????u????l?????????????????????Q???o?κ???????????????????????棬?????????????????????????????????????l????????l?????????豣????????????????u?O??????e??????????????O??r??O??????????????????????????SEM????t?^???????l????????

14. ????l?????????c????????????С?????????????????????????????????С????????????????????Ч?????????????????w??????????????l????????K??l?????????????????l?????????????10-10 torr??????????????m??????????????r??????????2500K(???^?????flashing)?????????????????w?????????????c??l?????????С??

15. ????l?????????1800K?????????????????????w??????????????棬???????????flashing????????????S???^???l?????????????K?????^?????????(10-9 torr)???????m??????c???????????????????????хs???????3~5?????????????^??????^??????á?

16. ????l????????????1800K?????S???u(100)?ξ????ZrO???w???ZrO????????????u??4.5eV????2.8eV??????????????λ???????????????????????????????^????(?K?????Ч??)?????????棬????????s10-8~10-9torr????l?????????????????l????????????????????????С???H???d?????l????????????????????????????????????????????l????????c??
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