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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]
Lanthanum is a chemical element with the symbol La and the atomic number 57. It is a soft , ductile , silvery-white metal that tarnishes slowly when exposed to air. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table , of which lanthanum is the first and the prototype.
CAS number LaAlO 3: lanthanum aluminate: 71496–78–1 LaB 6: lanthanum boride: 12008–21–8 LaBr 3: lanthanum bromide: 13536–79–3 La(CHO 2) 3: lanthanum formate: 2081–11–0 LaC 2: lanthanum carbide: 12071–15–7 LaCl 3: lanthanum chloride: 10099–58–8 LaCl 3 •3H 2 O: lanthanum chloride trihydrate: 35564–84–2 LaCl 3 •7H 2 ...
Carbon: 1.262 122 6(11) 121.776 3(1) [9] 6 ... La: Lanthanum: 0.557 546 ... Updated values can be found in the NIST chemistry webbook for around three dozen elements ...
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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).
A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). [ 1 ] The definitive visualisation of all 118 elements is the periodic table of the elements , whose history along the principles of the periodic law was one of the founding ...
The term derives from lanthanum, first discovered in 1838, at that time a so-called new rare-earth element "lying hidden" or "escaping notice" in a cerium mineral, [12] and it is an irony that lanthanum was later identified as the first in an entire series of chemically similar elements and gave its name to the whole series.