摘要
用 CaF_2单晶和 ZrO_2(+MgO)为固体电解质分别构成原电池:■和 Pt,B_((s)),NdBO_(3(s)),Nd(BO_2)_(3(s))|ZrO_2|Cr_2O_(3(s)),Cr_((s)),Pt联合测了 NdBO_3和 Nd(BO_2)_3的标准生成自由能:ΔG^0_(NdBO_3)=-1757+3.8×10^(-1)TΔG^0_(Nd)(BO_2)_3=-3435+8.8×10^(-1)T由此求出由氧化物生成 NdBO_3及 Nd((BO_2)_3)的反应的标准生成自由能变化:1/2Nd_2O_(3(s))+1/2B_2O_(3■)=NdBO_(3(s))ΔG^0_(NdBO_3)=-242+1.4×10^(-1)T和 1/2Nd_2O_(3(s))+3/2B_2O_(3(s))=Nd(BO_2)_(3■)ΔG^0′_(NdBO_2)3=-693+4.6×10^(-1)
The standard Gibbs free energy of formation of neodymiumborates was determined by means of emf measurements of cell with CaF_2 singlecrystal as well as ZrO_2 solid electrolytes.The measurements result inΔG_((NdBO)_3)~0=-1757+3.8×10^-(1T) and ΔG_((Nd(Bo_2)_3))~0=-3435+8.8×10^(-1)T.There-fore,the standard Gibbs free energy change of formation of neodymiumboratas from the constituent oxides is ΔG_((NdBO)_3)~0=-242+1.4×10^(-1)T for(1/2)B_(2O_3(1)),+(1/2)Nd_2O_(3(?))=NdBO_(3(?))and ΔG(Nd(BO_2)_3)~0=-693.0+4.6×10^(-1)T for (3/2)B_2O_3(1)+(1/2)Nd_2O_3(?)= Nd_((BO_2)_3(?)).
基金
国家自然科学基金
5860373
关键词
硼酸钕
热力学
自由能
thermodynamics
standard Gibbs free energy
neodymium borates
