Abubuwan da ba kasafai ba sun hada dalantanum(La)cerium(Ce),praseodymium(Pr),neodymium(Nd), promethium (Pm),samari(Sm),europium(Eu),gadolinium(Gd),terbium(Tb),dysprosium(Dy),holmium(Ho),erbium(Eh),thulium(Tm),ytterbium(Yb),Lutium(Lu),scandium(Sc), kumayttrium(Y).Sunan turanci shineRare Duniya.Rare Duniyakarafa ne gabaɗaya taushi, malleable, kuma ductile, da kuma nuna musamman karfi reactivity kamar foda a high yanayin zafi.Wannan rukunin karafa yana da aikin sinadarai mai ƙarfi sosai kuma yana da alaƙa mai ƙarfi don hydrogen, carbon, nitrogen, oxygen, sulfur, phosphorus, da halogens.Suna da sauƙi oxidized a cikin iska, kuma nauyikasa rareiya samar da wani abu mai kariya Layer oxidation a saman nascandiumkumayttriuma dakin da zafin jiki.Don haka,ƙarancin ƙasa karafaGabaɗaya ana adana su a cikin kananzir ko a cikin kwantena da aka rufe da ke cike da injin ruwa da iskar argon.Rare ƙasaabubuwa za a iya raba kashi biyu: haskekasa kasada nauyikasa kasa, yafi wanzuwa a cikin nau'i narare duniya oxides.China, Rasha, Amurka, Ostiraliya da sauran ƙasashe suna da mafi girman tanadi nakasa kasah albarkatun a duniya.Rare ƙasaAn fi amfani da su a fannoni kamar su man fetur, injiniyan sinadarai, ƙarfe, yadi, gilashin yumbu, kayan magnet na dindindin, da sauransu. An san su da "monosodium glutamate masana'antu", "bitamin masana'antu", da "mahaifiyar sabbin kayan", kuma sune albarkatu karfen dabaru masu daraja.
Lokacin aikawa: Nuwamba-03-2023