Synthesis and Characterization of Chemical – Substituted TbMnO3 Magnetic Oxide

• Main Authors: Yi-Hao Lien, 連俋豪
• Other Authors: Chao-Yuan Huang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/03061111377837001277

碩士 === 中國文化大學 === 材料科學與製造研究所 === 93 === (Tb1-xNax)MnO3 (0 ≦ x ≦ 0.3) and (Tb1-xEux)MnO3 (0 ≦ x ≦ 1.0) perovskites have been prepared by solid–state method and their crystal structure, magnetic and transport properties were investigated. These compounds were found to be of orthorhombic crystal structure with a space group Pbnm. The chemical pressure will increase with the substitution of Tb3+ by Na+ where as it is constant when Tb3+ substituted by Eu3+. We found that oxygen content will decrease when Na+ content increases due to the charge balance necessary for the compounds. On the other hand, doping of non – magnetic Na+ and Eu3+ into TbMnO3 exhibit spin glass state. The long range AF ordering has been frustrated to short range AF and FM ordering, so that there are two magnetic properties (AF and FM) observed in all compounds. Moreover, the resistivity is decreased with increasing Na+ and Eu3+ content.