Mn valence, magnetic, and electrical properties of LaMnO3+δ nanofibers by electrospinning.
LaMnO3+δ nanofibers have been prepared by electrospinning. The nearly 70% of Mn atoms is Mn4+, which is much higher than that in the nanoparticles. The average grain size of our fibers is approximately 20 nm, which is the critical size producing the nanoscale effect. The nanofibers exhibit a very broad magnetic transition with Tc≈255 K, and the Tc onset is around 310 K. The blocking temperature TB is 180 K. The sample shows weak ferromagnetic property above the TB and below Tc and superparamagnetic property near the Tc onset. The resistivity measurements show a metal-insulator transition near 210 K and an upturn at about 45 K.
Zhou
Xianfeng
X
Xue
Jiang
J
Zhou
Defeng
D
Wang
Zhongli
Z
Bai
Yijia
Y
Wu
Xiaojie
X
Liu
Xiaojuan
X
Meng
Jian
J
D003080:Cold Temperature; D004553:Electric Conductivity; D006358:Hot Temperature; D007811:Lanthanum / Q000737:chemistry*; D008280:Magnetics; D008345:Manganese / Q000737:chemistry*; D057139:Nanofibers / Q000737:chemistry* / Q000648:ultrastructure
D008345:Manganese; D007811:Lanthanum