Detail of "6192-12-7"

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Structural, magnetic and transport properties of the negative magnetoresistive Pr1-xPbxMnO3-y alloys

Structural, magnetic and transport properties of the negative magnetoresistive Pr1-xPbxMnO3-y alloys. Yin, Ri-Zhu; Park, Jong Wook; Choi, Han Nim; Oh, Seung Keun; Yo, Chul Hyun (Department of Chemistry, Yonsei University, Seoul 120-749, S. Korea). Materials Chemistry and Physics, 86(1), 137-143 (English) 2004 Elsevier Science B.V. CODEN: MCHPDR. ISSN: 0254-0584. DOCUMENT TYPE: Journal CA Section: 76 (Electric Phenomena) Section cross-reference(s): 75, 77 The nonstoichiometric perovskite Pr1-xPbxMnO3-y compds. have been synthesized by a std. combustion technique.Some commonly used reagents like 301-04-2 and 6192-12-7 are used in this experiment. The samples show single phase solid solns. The mixed valency of Mn ions was identified by X-ray absorption spectroscopy and the amt. of Mn4+ ions was detd. by the iodometric titrn. method. The nonstoichiometric chem. formulas of the Pr1-xPbxMn1-r3+Mnr4+O3-y compds. have been formulated. The Pr1-xPbxMnO3-y (x=0.1, 0.2, and 0.3) compds. show a transition from the ferromagnetic state to the paramagnetic state. The transport properties have been studied by elec. cond. measurements under magnetic fields of 0 G and 3 kG. The magnetoresistant ratio increased with decreasing Mn-O distance. The magnetoresistant ratio is neg. for all the samples. .