Synthesis of lanthanum oxide nanopartic les in presence of c itric acid or starch as emul sifier

Lanthanum oxide is an odorless, white solid that is insoluble in water, but soluble in dilute acid. It is hygros copic; und er atmosphe re, it absorbs moisture over time and converts to lanthanum hydroxide. It ha s p-type s emi-conducting prope rties becau se its resistivity decrea ses with an increase in temperature , average r oom temper ature resisti vity is ۱۰ k Ω·cm. At low temperatu res, it has an A-M۲O۳ h exagonal cry stal structure and at hig h temperatu res it converts to a C-M۲O۳ cubic crystal structu re. [۱].Mate rials and m ethods:Samples were prepared by a method similar to the so-called cit rate method using lanthanum nitrate, citric acid or starch a s emulsifier [۲]. A dried solution of the samples was calci ned at ۶۰۰ a nd ۹۰۰oC. T he product s were char acterized by the FT-IR, XRD and TG/DTA st udies. The sp ecific surface area of sa mples was measured by the BET method.

کلیدواژه ها:

Lanthanum oxide ، Nano-particles ، Citric acid ، Starch ، Emulsifier.