Effects of non-magnetic Ti 4+ ion doping on the structural, magnetic and magnetocaloric properties of La 0.65 Dy 0.05 Sr 0.3 Mn 1−x Ti x O 3 compounds

摘要: Perovskite manganites have many prospective applications as magnetic solids, however, their synthesis remains challenging of a high purity and crystallinity. Herein, solid state method has been successfully employed for the La0.65Dy0.05Sr0.3Mn1−xTixO3 (x = 0.05 x = 0.10) materials. Moreover, impact Mn by Ti ion substitution on structural, magnetocaloric properties fully looked into. The Rietveld refinement technique showed that all compounds crystallize in orthorhombic structure with Pbnm space group Mn4+ Ti4+ causes increase unit cell volume. Magnetization versus temperature measurements shows large ferromagnetic–paramagnetic transition decreasing temperature. Curie TC fall rise titanium content from 175 K x = 0.05 to 114 K x = 0.10. An analysis both Banerjee criteria Landau theory revealed a second-order phase at current manganites. is calculated through measurement initial isothermal magnetization applied field various temperatures. maximum entropy change $$\left| {\Delta {\text{S}}_{\text{M}}^{ \hbox{max} }} \right|$$ , which basis curves under 5 T found be 1.79 J kg−1 K−1 1.49 J kg−1 0.10, respectively. relative cooling power (RCP) rose 239 J kg−1 211 J kg−1 x = 0.05, In fact, our results match those about some other doped manganites, imply these materials may appropriate candidates working substances applications. Furthermore, normalizing $$\Delta {\text{S}}_{{\text{M}}} ({\text{T}},\mu_{0}{\text{H}})$$ respective S^{\prime}\left( {{{ = \Delta \left( {\text{T}} \right)} \mathord{\left/ {\vphantom {{ {\text{S}}_{{\text{M}}}^{{{\text{Max}}}} }}} \right. \kern-\nulldelimiterspace} \right)$$ values, we noticed obtained drop universal master curve. combination experiment data favorable better understanding manganite properties.