ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Polycrystalline samples of La0.67Ba0.33(Mn1-xRux)O3 with x = 0, 0.05, 0.1, 0.15 and 0.2have been prepared using solid state reaction. The effects of doping of Ru at Mn site on La-Ba-Mn-O ceramics, the characteristics and magnetotransport properties of CMR materials are investigated.The magnetoresistance (MR) effect is measured using the four point probe technique. Themagnetoresistance defined as MR% = (Ro – RH)/RH x 100% was measured at a magnetic field of H≤ 1T at 90K, 100K, 150K, 200K, 250K, 270K and 300K for the sample of doping x = 0, 0.05, 0.1,0.15 and 0.2. Overall, MR drops slowly when temperature rises. All doping concentration givessmall variation range (~2.7% to ~26.78%). The electrical property has determined by usingstandard four-point probe resistivity measurement in a temperature range of 30 K to 300 K. Metalinsulatortransition temperature (Tp) shifted to lower temperatures as Ru doping is increased. In thispaper the structural pattern and microstructure property have investigated via XRD. XRD patternsshow that these systems are in orthorhombic distorted perovskite structures
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.517.45.pdf
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