Structure and Properties of Nd0.67(Sr,Ca)0.33Mn(O,F)3 with Colossal Magnetoresistance

Journal of Inorganic Materials

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Structure and Properties of Nd_0.67(Sr,Ca)_0.33Mn(O,F)₃ with Colossal Magnetoresistance

LIU Yao-Cheng^a,b; GUO Yong-Quan^a; ZHOU He-Ping^a,b; TAO Kun^a

^aDepartment of Materials Science and Engineering; Tsinghua University Beijing 100084 China; ^bState Key Laboratory of New Ceramics and Fine Processing; Tsinghua University Beijing 100084 China

Received:1998-06-26 Revised:1998-08-17 Published:1999-06-20 Online:1999-06-20

Abstract

Abstract: Compounds of Nd_0.67(Sr,Ca)_0.33Mn(O,F)₃ (NSMO) with colossal magnetoresistance (CMR)were prepared with CaF₂ as dopant. X-ray diffraction with Rietveld analysis showed that NSMO compounds were of perovskite structures, with space groups of Pbnm, Z=4, and F- occupying 8d positions. As more amount of CaF₂ were used, the lattice parameters and To of NSMO declined.The magnetoresistance (-△R/R) increased to a maximum of 99.7% when 20mol% CaF₂ was doped.

Key words: colossal magnetoresistance, Rietveld analysis, Nd_0.67Sr_0.33MnO₃

CLC Number:

TM271

LIU Yao-Cheng,GUO Yong-Quan,ZHOU He-Ping,TAO Kun. Structure and Properties of Nd_0.67(Sr,Ca)_0.33Mn(O,F)₃ with Colossal Magnetoresistance[J]. Journal of Inorganic Materials.

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Structure and Properties of Nd_0.67(Sr,Ca)_0.33Mn(O,F)₃ with Colossal Magnetoresistance

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