Structural, magnetic and magnetocaloric properties of Ag-doped Pr<sub>0.5sub>Sr<sub>0.5-xsub>Ag<sub>xsub>MnO<sub>3sub> manganites (0.0≤<span style='font-style: italic'>x≤0.4)
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- 作者：S. Tarhouni<sup>asup><sup> ; sup><sup>bsup><sup> ; sup><sup>tarhouni.sabrine@ymail.com" class="auth_mail" title="E-mail the corresponding authorsup> ; A. Mleiki<sup>asup><sup> ; sup><sup>bsup> ; I. Chaaba<sup>asup> ; H. Ben Khelifa<sup>asup><sup> ; sup><sup>bsup> ; W. Cheikhrouhou-Koubaa<sup>asup><sup> ; sup><sup>bsup> ; M. Koubaa<sup>asup> ; A. Cheikhrouhou<sup>asup> ; E.K. Hlil<sup>csup>
- 关键词：Manganites ; X-ray diffraction ; Magnetization ; Magnetocaloric effect
- 刊名：Ceramics International
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：43
- 期：1
- 页码：133-143
- 全文大小：2214 K
文摘
The effects of partial silver substitution on the structural, magnetic and magnetocaloric properties of Pr<sub>0.5sub>Sr<sub>0.5-xsub>Ag<sub>xsub>MnO<sub>3sub> (0.0≤x≤ 0.4) compounds have been studied. Our powder specimens are synthesized using the sol-gel method at high temperatures. X-Ray diffraction study reveals that all compounds crystallize in the distorted orthorhombic symmetry with Pbnm space group. Magnetization measurements versus temperature under 0.05 T reveal the presence of an antiferromagnetic (AFM) to ferromagnetic (FM) transition at low temperatures for the parent compound, followed by a second one from FM to paramagnetic state (PM). Ag doping is found to reinforce the FM behavior with a Curie temperature (T<sub>Csub>) increasing from 268 (x=0.0) to 305 K(x=0.2). However, for higher Ag amount, T<sub>Csub> decreases again from 285 K (x=0.3) to 170 K (x =0.4). The maximum of the magnetic entropy change (<span id="mmlsi0005" class="mathmlsrc">source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884216316534&_mathId=si0005.gif&_user=111111111&_pii=S0272884216316534&_rdoc=1&_issn=02728842&md5=cf2dcb1f87ac158da37bcb9d24c03969">![]()
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style="vertical-align:bottom" width="51" alt="View the MathML source" title="View the MathML source" src="http://origin-ars.els-cdn.com/content/image/1-s2.0-S0272884216316534-si0005.gif">noscript><span class="mathContainer hidden"><span class="mathCode">span>span>span>) was calculated using the isothermal magnetization curves M (H) under magnetic field change of 5 T and is found to be 4.7 J/(kg K) for x=0.3. The relative cooling power (RCP) turns out to be 188 J/kg and 229 J/kg for x=0.0 and x=0.1, respectively. This suggests that these compounds may be suitable candidates for magnetic refrigeration.