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A lanthanum hexaboride hot cathode. Lanthanum hexaboride cathodes. Lanthanum hexaboride powdered. Lanthanum hexaboride (La B 6, also called lanthanum boride and LaB) is an inorganic chemical, a boride of lanthanum. It is a refractory ceramic material that has a melting point of 2210 °C, and is insoluble in water and hydrochloric acid. [1]
The CuTi 2 structure of the lanthanum, cerium and praseodymium diiodides along with HP-NdI 2 contain 4 4 nets of metal and iodine atoms with short metal-metal bonds (393-386 La-Pr). [10] these compounds should be considered to be two-dimensional metals (two-dimensional in the same way that graphite is). The salt-like dihalides include those of ...
Cerium hexaboride (Ce B 6, also called cerium boride, CeBix, CEBIX, and (incorrectly) CeB) is an inorganic chemical, a boride of cerium. It is a refractory ceramic material. It has a low work function, one of the highest electron emissivities known, and is stable in vacuum. The principal use of cerium hexaboride is a coating of hot cathodes. It ...
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Lanthanum hexaboride (LaB 6) and cerium hexaboride (CeB 6) are used as the coating of some high-current cathodes. Hexaborides show low work function, around 2.5 eV. They are also resistant to poisoning. Cerium boride cathodes show lower evaporation rate at 1700 K than lanthanum boride, but it becomes equal at 1850 K and higher. Cerium boride ...
Lanthanum oxide and the boride are used in electronic vacuum tubes as hot cathode materials with strong emissivity of electrons. Crystals of LaB 6 are used in high-brightness, extended-life, thermionic electron emission sources for electron microscopes and Hall-effect thrusters. [61] Lanthanum trifluoride (LaF
Lanthanum magnesium – LaMg; Lanthanum manganite – LaMnO 3; Lanthanum mercury – LaHg; Lanthanum silver – LaAg; Lanthanum thallium – LaTl; Lanthanum zinc – LaZn; Lanthanum boride – LaB 6; Lanthanum carbonate – La 2 (CO 3) 3; Lanthanum(III) chloride – LaCl 3; Lanthanum trifluoride – LaF 3; Lanthanum(III) oxide – La 2 O 3 ...
The higher boride LnB 66 is known for all lanthanide metals. ... When the lanthanum ion was introduced to the cell in vivo or in vitro, it inhibited the rapid growth ...