Combined effects of hole doping and off-stoichiometry on the structures, transport, and magnetic properties of Sr(2?y)NayFe(1?x)Mo(1+x)O6 (x = 0/5x = y; y = 0, 0.05, 0.1, 0.15, 0.2, and 0.3)

Jin-Feng Wang; Yan-Ming Zhang

首页> 外文期刊>RSC Advances >Combined effects of hole doping and off-stoichiometry on the structures, transport, and magnetic properties of Sr_(2?y)Na_yFe_(1?x)Mo_(1+x)O₆ (x = 0/5x = y; y = 0, 0.05, 0.1, 0.15, 0.2, and 0.3)

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Combined effects of hole doping and off-stoichiometry on the structures, transport, and magnetic properties of Sr_(2?y)Na_yFe_(1?x)Mo_(1+x)O₆ (x = 0/5x = y; y = 0, 0.05, 0.1, 0.15, 0.2, and 0.3)

机译：空穴掺杂和化学计量比对Sr _{（2？ y ） Na _{y Fe _{（1？ x ） Mo _{（1+ x ） The _{6 （ x = 0/5 x = y ; y = 0，0.05，0.1， 0.15、0.2和0.3）}}}}}

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A series of double perovskite, Sr_(2?y)Na_yFeMoO₆ (y = 0, 0.05, 0.1, 0.15, 0.2, and 0.3) and Sr_(2?y)Na_yFe_(1?x)Mo_(1+x)O₆ (5x = y; y = 0.05, 0.1, 0.15, 0.2, and 0.3), ceramics were synthesized via a solid-state reaction. The influences of the doped Na (y) and off-stoichiometry (excess Mo: x) content on the structure, magnetization, chemical states, resistivity, magnetoresistance (MR), and the Curie temperature (T_C) were systematically and comparatively investigated. The X-ray diffraction results indicated that the Fe/Mo ordering degree in Sr_(2?y)Na_yFeMoO₆ and Sr_(2?y)Na_yFe_(1?x)Mo_(1+x)O₆ exhibited a slight suppression for y = 0–0.15, whereas a significant decrease was observed for y = 0.2 and 0.3. X-ray photoelectron spectroscopy results confirmed that the chemical states of Fe and Mo cations in all the samples had +3 and +5 valences. With the decreasing y values, it was observed that the saturated magnetization M_s demonstrated a gradual decrease, in good agreement with the suppression of the Fe/Mo ordering degree. This close correlation between the magnetic properties and the Fe/Mo ordering degree indicates that the magnetic behaviors are predominantly controlled by the ordering degree of Fe/Mo in all the ceramics. The MR behavior in the samples is mainly determined by the grain boundary conditions. Upon comparing Sr_(2?y)Na_yFeMoO₆ with Sr_(2?y)Na_yFe_(1?x)Mo_(1+x)O₆ (5x = y) for the same y value, Sr_(2?y)Na_yFe_(1?x)Mo_(1+x)O₆ (5x = y) showed a decreased grain boundary strength (the resistivity); thus, a diminished MR performance was observed, indicating that introducing excess Mo into the hole-doped Sr₂FeMoO₆ system was disadvantageous for practical applications. Interestingly, the T_C of both Sr_(2?y)Na_yFeMoO₆ and Sr_(2?y)Na_yFe_(1?x)Mo_(1+x)O₆ (5x = y) gradually decreased until y = 0.15, but improved on further increasing the y value. This composition-dependent tendency of T_C cannot be explained only on the basis of the itinerant electron density, which is responsible for the optimized T_C in the electron-doped Sr₂FeMoO₆ systems. 展开▼

机译：一系列双重钙钛矿Sr _{（2？ y ） Na _{y FeMoO _{6 （ y = 0、0.05、0.1、0.15、0.2和0.3）和Sr _{（2？ y ） Na _{y Fe _{（1？ x ） Mo _{（1+ x ） O _{6 （5 x = y ; y = 0.05，0.1，0.15 ，0.2和0.3），通过固相反应合成了陶瓷。掺杂的Na（ y ）和非化学计量比（过量的Mo： x ）对结构，磁化强度，化学状态，电阻率，磁阻（MR）的影响，对居里温度（ T _{C ）进行了系统的比较研究。 X射线衍射结果表明，Sr _{（2？ y ） Na _{ y FeMoO _{6 和Sr _{（2？ y ） Na _{y Fe _{（1？ x ） Mo _{（1+ x ） O _{6 对 y = 0-0.15表现出轻微的抑制作用，而对 y = 0.2和0.3则有明显的抑制作用。 X射线光电子能谱结果证实，所有样品中的Fe和Mo阳离子的化学态均具有+3和+5价。随着 y 值的减小，观察到饱和磁化强度 M _{s 呈逐渐减小的趋势，同意抑制Fe / Mo有序度。磁性和Fe / Mo有序度之间的这种紧密相关性表明，在所有陶瓷中，磁性行为主要受Fe / Mo有序度控制。样品中的MR行为主要取决于晶界条件。比较Sr _{（2？ y ） Na _{y FeMoO _{6 ，带有Sr _{（2？ y ） Na _{y Fe _{（1？ x ） Mo _{（1+ x ） O _{6 （5 x = y ）表示相同的 y 值，即Sr _{（2？ y ） Na _{y Fe _{（1？ x ） Mo _{（1+ x ） O _{6 （5 x = y ）显示出降低的晶界强度（电阻率）;因此，观察到MR性能下降，这表明将过量的Mo引入到掺杂了空穴的Sr _{2 FesmallO _{6 系统对实际应用不利。有趣的是，两个Sr _{（2？ y ） T _{C > Na _{y FeMoO _{6 和Sr （2？ y ） Na _{y Fe （1？ x ） Mo _{（1+ x ） O _{6 （5 x = y ）逐渐减小，直到 y = 0.15，但是在进一步增加 y 值方面进行了改进。 T _{C 的这种与组分有关的趋势不能仅基于流动电子密度来解释，该电子密度负责优化 T 掺电子的Sr _{2 FeMoO _{6中的> T _{C 系统。}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} 展开▼

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《RSC Advances》 |2017年第42期|共9页

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Jin-Feng Wang; Yan-Ming Zhang;
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Combined effects of hole doping and off-stoichiometry on the structures, transport, and magnetic properties of Sr(2?y)NayFe(1?x)Mo(1+x)O6 (x = 0/5x = y; y = 0, 0.05, 0.1, 0.15, 0.2, and 0.3)

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Combined effects of hole doping and off-stoichiometry on the structures, transport, and magnetic properties of Sr_(2?y)Na_yFe_(1?x)Mo_(1+x)O₆ (x = 0/5x = y; y = 0, 0.05, 0.1, 0.15, 0.2, and 0.3)