Yttrium, cerium, neodymium, lanthanum as well as trace to minor amounts of other rare earth elements are present in their structure.
en.wikipedia.org For example, (protactinium), (beryllium), (chromium), and (lanthanum) are obscure characters meaning raw iron, needle, hook, and harrow respectively.
en.wikipedia.org The compound is isostructural with all other reported rare earth hexaboride compounds including lanthanum hexaboride, samarium hexaboride, and cerium hexaboride.
en.wikipedia.org In the lithium niobate is a trigonally distorted perovskite-like structure, whereas the lanthanum niobate contains lone ions.
en.wikipedia.org The shorter gap is thanks to a new technique that fabricates epitaxial strontium titanate films with equal concentrations of lanthanum and chromium additives, or dopants.
phys.org