Chemie Der Seltenen Erden
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: \Ian bezeiclmet mit, seltenen Erden" eine Anzahl schwer reducirbarer Oxyde, deren chemisehe und physikalisehe Eigen- sehaften sieh ausserordentlieh wenig unterseheiden. Sie finden sieh in gewissen selten und in geringer: Menge vorkommenden . Ylineralien. Die Aufmerksamkeit auf sie ist seit den letzten zehn Jahnm in ausserordentliehem l\Iaasse gelenkt worden dureh die hoehst geniale und wirthsehaftlieh hervorragende Erfindnng del' Gasglilhlichtkorper von Au e l' von WeI s b a e h in W ien, del' zur Herstellung derselben sieh ausschliesslich del' Sa. lze bedient, die aus den seltenen Erden gewonnen wurden. Der Erforschung sowie dem weiteren Ausban der Chemie diesel' Grnppe wandte man fill' die Folge erhohten Eifel' zu und man gelangte bei der Bearbeitung des Thol'llitrats aus clem Monazit- sand sogar zu einer chemischen Grossindnstrie. Chemiker aller Lander haben sieh an diesem Ansban eifrigst betheiligt und noeh immer ist auf diesem Gebiete dem forsehenclen Geiste ein weites Feld geoffnet. Die Verfasser versuchten eine mog- lichst vollstandige, wenn auch geclriingte Uebersicht auf diesem Arbeitsfelcle der Forsclmng zn schaffen durch eine M 0 n 0 g r a- phie der seltenen Erden, die nicht nul' dem bereits in der Technik stehenden Chemiker zur Orientirung ii. ber Dar- stellungs- unll Reinigungsmethoden dienen, sondel'll auch dem Forscher an Hand del' moglichst eingehend benutzten und ange- fii. hrten Literaturquellen, die Weiterarbeit erleichtel'll diirfte. Dem Stnclirenden wird das Werkchen eine bessere Uebersicht IV Vorwort.
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