We have investigated the effect of synthesis method on critical behavior and magnetic entropy change of La_0.7Ba_0.1Ca_0.1Sr_0.1MnO₃. The samples were prepared using the wet-mixing (WM) and sol-gel (SG) methods. The Curie temperature (T_C) was approximately 316 and 330 K for the WM and SG samples, respectively. The estimated critical exponents (β, γ, and δ) were close to the mean-field theory for the WM samples, whereas the exponent values for the SG sample were close to the tricritical mean-field model. The difference in the estimated critical exponents obtained from the same sample is known as a crossover phenomenon. The maximum magnetic entropy change (−ΔS_M) under an applied magnetic field at 5 T was estimated at 3.16 and 4.89 J.kg⁻¹.K⁻¹ for the WM and SG samples, respectively. The synthesis method strongly affected physical properties and universality class, which can be explained by changes in the structural parameter and by grain size reduction.

我们研究了合成方法对La _0.7 Ba _0.1 Ca _0.1 Sr _0.1 MnO _3的临界行为和磁熵变的影响。使用湿混合（WM）和溶胶-凝胶（SG）方法制备样品。对于WM和SG样品，居里温度（T _C）分别约为316和330K。估计的临界指数（β，γ和δ）接近WM样本的平均场理论，而SG样本的指数值接近三临界平均场模型。从同一样本获得的估计临界指数之差称为交叉现象。的最大磁熵变（-Δ小号_中号在5吨施加的磁场）下估计为3.16和4.89 J.kg ^-1 .K ^-1的WM和SG样品，分别。该合成方法极大地影响了物理性能和通用性等级，这可以通过改变结构参数和减小晶粒尺寸来解释。