Dc and ac$–$magnetic susceptibility (χ), specific heat ($C_{\text{P}}$), electrical resistivity (ρ) and magnetoresistance measurements performed on the new polycrystalline compound ${\text{Gd}}_2{\text{AgSi}}_3$, crystallizing in the α$–{\text{ThSi}}_2$ tetragonal structure, are reported. Two magnetic phase transitions were observed in dc and ac susceptibility, specific heat and resistivity measurements at temperatures ${\text{T}}_{{\text{N}}_1}=11$ K and ${\text{T}}_{{\text{N}}_2}=20$ K, despite a single site occupied by Gd atom, which is an indication of the complex magnetic behavior. ${\text{Gd}}_2{\text{AgSi}}_3$ turns out be one of the rare Gd compound in which a minimum is observed in the temperature dependence of resistivity in the paramagnetic state and also negative magnetoresistance over a wide temperature range (above ${\text{T}}_{{\text{N}}_2}$), mimicking the behavior of exotic ${\text{Gd}}_2{\text{PdSi}}_3$, in this ternary family. The isothermal magnetic entropy change, adiabatic temperature change, and refrigerant capacity reach a value of 9.5 J/kg-K, 7.5 K and 302 J/kg, respectively for the change of magnetic field 0-9 T.

直流和交流$–$磁化率（χ），比热（$C_{\text{P}}$），对新的多晶化合物进行的电阻率（ρ）和磁阻测量 ${\text{d}}_{\mathrm{2个}}{\text{银硅}}_3$，在α中结晶$–{\text{锡}}_{\mathrm{2个}}$四角形结构，已有报道。在直流和交流磁化率，比热和温度下的电阻率测量中观察到两个磁性相变${\text{Ť}}_{{\text{ñ}}_{\mathrm{1个}}}=11$ K和 ${\text{Ť}}_{{\text{ñ}}_{\mathrm{2个}}}=20$ 尽管有单个位点被Gd原子占据，但K仍是K，这表明了复杂的磁行为。 ${\text{d}}_{\mathrm{2个}}{\text{银硅}}_3$ 成为稀有的Gd化合物之一，其中在顺磁状态下的电阻率与温度的相关性最小，并且在较宽的温度范围内也具有负磁阻（以上） ${\text{Ť}}_{{\text{ñ}}_{\mathrm{2个}}}$），模仿异国情调的行为 ${\text{d}}_{\mathrm{2个}}{\text{钯硅}}_3$在这个三元家庭中 磁场0-9 T的变化，等温磁熵变，绝热温度变化和制冷剂容量分别达到9.5 J / kg-K，7.5 K和302 J / kg。