Studies of Synthesis , Structure and Transport Properties of Alkali Metal Doped Tungsten Oxides.

• Main Authors: ChenPin Wang, 王建彬
• Other Authors: Chien F. Z.
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/67341869838765945330

碩士 === 淡江大學 === 物理學系 === 91 === The aspect of this thesis is to study the alkaline-earth doping in the parent compound WO3.We observed this series sample.In the In-situ measurement,an oxygen concentration dependent metal-nonmetal transition was observed.The electric behavior woule be changed from metal (the room temperature resistivity was smaller than 10-3Ω-cm) into nonmetal(the room temperature resistivity was greater than 10-3Ω-cm) by increasing the concentration of the oxygen.In the sintering process,it was found that the resistivity of the sample suddenly rose from 8.8×10-4Ω-cm to 1.66×10-3Ω-cm at temperature of 940oC.We took the RbxAuyWOz series as the principal things in studying magnetic properties.After sintering,we found that the sample(RbxAu0.05WOδ x=0.22、0.17、0.12)produced antiferromagetic several days later.