Synthesis, phase transition and structural properties of LPMO nanoperovskites with influence of grain size towards ultrasonic studies

M. Vigneswari; S. Sudharsan; S. Sankarrajan

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Synthesis, phase transition and structural properties of LPMO nanoperovskites with influence of grain size towards ultrasonic studies

机译：LPMO纳米钙钛矿的合成，相变和结构性质对晶粒尺寸的影响

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In this present work, nanocrystalline powders of Pb-doped LaMnO_(3) or La_(0.64)Pb_(0.36)MnO3 (LPMO) have been synthesized with various grain sizes by a solid-state reaction method followed by ball milling technique. Based on the dependence of crystallite size, the magnetic properties of the LPMO nanoperovskites have been investigated. The nanoperovskites have been structurally characterized. Further, the synthesized nanoperovskite manganite materials with various grain sizes are systematically studied for ultrasonic longitudinal velocity (U _(L )), shear velocity (U _(S )) and longitudinal and shear attenuation (α _(L ) and α _(S )) in wide range of temperatures. All the nanoperovskites revealed an anomalous behaviour in concern with ultrasonic velocities and attenuation towards the phenomenon of phase transition.

机译：在本工作中，通过固态反应法，然后通过球磨技术，合成了具有各种晶粒尺寸的掺Pb的LaMnO_（3）或La_（0.64）Pb_（0.36）MnO3（LPMO）纳米晶体粉末。基于微晶尺寸的依赖性，已经研究了LPMO纳米钙钛矿的磁性。纳米钙钛矿已经在结构上表征。此外，系统地研究了合成的具有各种晶粒尺寸的纳米钙钛矿锰矿材料的超声纵向速度（U_（L）），剪切速度（U_（S）），纵向和纵向。宽温度范围内的剪切衰减（α_（ L）和α_（ S））。所有的纳米钙钛矿都显示出与超声波速度有关的异常行为，并且衰减了对相变现象的影响。

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《Cogent Chemistry》 |2015年第1期|共13页
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M. Vigneswari; S. Sudharsan; S. Sankarrajan;
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Synthesis, phase transition and structural properties of LPMO nanoperovskites with influence of grain size towards ultrasonic studies

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