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作为一种新型功能材料,为获得更高的电子发射电流密度和更好的电子束品质,对于铁电电子发射机理的探讨,一直方兴未艾。针对采用锆钛酸铅、钛酸钡和钛酸铋钠这3种不同铁电阴极材料,进行了电子发射实验,并着重对样品电子发射前后的宏微观变化进行了对比分析。认为不同种类的铁电材料遵循不同的电子发射机理,等离子体在发射过程中起着重要作用。对于钛酸钡材料,电子发射以等离子体致电子发射为主;对于钛酸铋钠材料,电子发射以快极化反转电子发射为主;而对于锆钛酸铅材料,2种机理作用兼而有之。
As a new type of functional material, in order to obtain higher electron emission current density and better electron beam quality, the discussion on the ferroelectric electron emission mechanism has been in the ascendant. Electron emission experiments were carried out on three different ferroelectric cathode materials using lead zirconate titanate, barium titanate and sodium bismuth titanate. The macro and micro changes before and after the electron emission were emphatically analyzed. It is believed that different types of ferroelectric materials follow different electron emission mechanisms and the plasma plays an important role in the emission process. For barium titanate material, the electron emission is mainly plasma-induced electron emission; for bismuth sodium titanate material, the electron emission is mainly based on fast-reversal electron emission; and for the lead zirconate titanate material, both the mechanism and effect And there.