41. Yttrium oxide is also used to make yttrium iron garnets, which are very effective microwave filters. 42. When quaternary ammonium salts are used as extractants, most yttrium will remain in the aqueous phase. 43. Its spectrum also shows other s-process elements such as barium, yttrium , and lanthanum. 44. When containing a substantial amount of oxygen, yttrium hydride is also found to exhibit photochromic properties. 45. It's the root of four element names, Yttrium , Erbium, Ytterbium, and Terbium. 46. Europium-doped yttrium vanadate was the first red phosphor to enable the development of color television screens. 47. Yttrium has no known biological role, and exposure to yttrium compounds can cause lung disease in humans.48. Yttrium has no known biological role, and exposure to yttrium compounds can cause lung disease in humans. 49. However, this model fails to address superconductivity in the homologue Pr123 ( praseodymium instead of yttrium ). 50. Yttrium oxide is used as a common starting material for both materials science as well as inorganic compounds.
