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首页> 外文期刊>Physica, B. Condensed Matter >Magnetic and transport properties of polycrystalline La _(1-x)Ba_xMnO_3 (x=0, 0.11, and 0.33) annealed in different conditions
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Magnetic and transport properties of polycrystalline La _(1-x)Ba_xMnO_3 (x=0, 0.11, and 0.33) annealed in different conditions

机译：在不同条件下退火的多晶La _（1-x）Ba_xMnO_3（x = 0、0.11和0.33）的磁性和输运性质

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摘要

The hole-doped rare-earth manganite La_(1-x)Ba_xMnO _3 has become the subject of intense interest recently. We compared the magnetic and transport properties of polycrystalline La_(1-x)Ba _xMnO_3 annealed in different conditions. Polycrystalline La_(1-x)Ba_xMnO_3 (x=0, 0.11, 0.33) was annealed in the presence of O_2, N_2, and N_2 with graphite powder nearby (as oxygen getter), or 95% Ar5% H_2 gas mixture (AH) at 700 °C for 3 h. LaMnO_(3δ) (x=0) was turned into LaMnO _(3ξ) (ξ>δ) or LaMnO_3 when annealing occurred in the presence of O_2 or reducing agent, respectively. Interestingly, a mixture of oxygen excessive phase La_(0.89)Ba_(0.11)MnO _(3δ) and oxygen stoichiometric phase La_(0.89)Ba _(0.11)MnO_3 (x=0.11) was produced when annealing happened in the presence of O_2, with La_(0.89)Ba_(0.11)MnO _(3δ) on the surface of the mixture. Similar changes were found when using other gas conditions. For x=0.33, only La_(0.67)Ba _(0.33)MnO_3 was produced, in which the number of oxygen atoms could be further reduced by annealing in the presence of AH. We concluded that the undoped and low doped rare-earth manganites La_(1-x)Ba _xMnO_3 easily take more than three oxygen atoms, and the excessive oxygen can be removed by annealing in reducing condition.
机译：空穴掺杂稀土锰La_（1-x）Ba_xMnO_3最近成为人们关注的主题。我们比较了在不同条件下退火的多晶La_（1-x）Ba _xMnO_3的磁性和输运性质。在O_2，N_2和N_2存在下，将多晶La_（1-x）Ba_xMnO_3（x = 0、0.11、0.33）与附近的石墨粉（作为吸气剂）或95％Ar5％H_2气体混合物（AH）退火在700°C下放置3小时。当在O_2或还原剂的存在下发生退火时，LaMnO_（3δ）（x = 0）分别变为LaMnO_（3δ）（ξ>δ）或LaMnO_3。有趣的是，当在O_2存在下发生退火时，产生了氧过量相La_（0.89）Ba_（0.11）MnO _（3δ）和氧化学计量相La_（0.89）Ba _（0.11）MnO_3（x = 0.11）的混合物，混合物表面上有La_（0.89）Ba_（0.11）MnO _（3δ）。当使用其他气体条件时，发现了类似的变化。对于x ＝ 0.33，仅产生La_（0.67）Ba_（0.33）MnO_3，其中可以通过在AH的存在下退火来进一步减少氧原子数。我们得出的结论是，未掺杂和低掺杂的稀土锰矿La_（1-x）Ba _xMnO_3容易吸收三个以上的氧原子，并且过量的氧可通过在还原条件下退火去除。

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