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Citation: Zhang Jian-Hui, Zhu Chang-Fei, Li Ya-Dong, Li Xiao-Guang. Mixed Doping and Nonstoichiometry Effect in Manganate[J]. Acta Physico-Chimica Sinica, ;1999, 15(01): 44-49. doi: 10.3866/PKU.WHXB19990109 shu

Mixed Doping and Nonstoichiometry Effect in Manganate

1.
Department on Materials Science and Engineering,University of Science and Technology of China,Hefei 230026

Received Date: 9 March 1998
Available Online: 15 January 1999

The microstructure and electric conduction variations in compounds Nd0.67Sr0.33-xBaxMnO3(x=0.27, 0.165, 0.06) and Nd0.67SrxBaxMnOz(x=0.27, 0.06) were studied. It was found that the conduction mechanism of Nd0.67Srx.Ba0.33-xMnO3 doped by mixed divalent ions differs from that of Nd0.67Sr0.33 MnO3 or Nd0.67Ba0.33MnO3 doped by single divalent ions. Due to the lattice contraction induced by nonstoichimetry, the resistivity reduces obviously and the resistivity transition (I-M) appears with decreasing temperature in Nd0.67SrxBaxMnOz. In addition, it was found that the lattice contraction induced by the nonstoichiometry on Mn site is larger than that on A site.
- Mixed doping,
- Nonstoichiometry,
- Lattice contraction,
- Electric conduction
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