CAJ | 학술논문

为了弄清Mg含量对Ca3Mg2Ni13型化合物结构参数和储氢性能的影响,利用X射线衍射研究了Ca3-xMg2+x,Ni13(x=0.5,1.0和1.5)合金的相结构,并采用Sieverts型设备测量了其P-C-T曲线.研究表明,Mg在Ca3Mg2Ni13型化合物中的最大固溶度接近于Ca1.5Mg<,3.5>Ni13合金中的Mg含量.固溶的Mg含量增加导致化合物点阵常数减小,这可以有效地改善吸放氢热力学性能,其中Ca2Mg3Ni13吸、放氢的焓变分别为-28,30 kJ/mol H2.此外,Ca2Mg3Ni13在吸放氢循环过程中不发生氢致非晶化和氢致分解,因而具有良好的循环稳定性.
위료롱청Mg함량대Ca3Mg2Ni13형화합물결구삼수화저경성능적영향,이용X사선연사연구료Ca3-xMg2+x,Ni13(x=0.5,1.0화1.5)합금적상결구,병채용Sieverts형설비측량료기P-C-T곡선.연구표명,Mg재Ca3Mg2Ni13형화합물중적최대고용도접근우Ca1.5Mg<,3.5>Ni13합금중적Mg함량.고용적Mg함량증가도치화합물점진상수감소,저가이유효지개선흡방경열역학성능,기중Ca2Mg3Ni13흡、방경적함변분별위-28,30 kJ/mol H2.차외,Ca2Mg3Ni13재흡방경순배과정중불발생경치비정화화경치분해,인이구유량호적순배은정성.
To understand the effects of Mg content on the structural parameters and hydrogen storage properties of Ca3Mg2Ni13-type compound, the phase structures of the Ca3-xMg2+xNi13 (x =0.5, 1.0 and 1.5 ) alloys were investigated by X-ray diffraction (XRD) and their pressure-composition isotherms (P-C-T curves) were measured with a Sieverts-type apparatus. The results indicate that the maximum solid solubility of Mg in the Ca3Mg2Ni13-type compound is close to the Mg content of Ca1.5 Mg3.5 Ni13 alloy. The increase of Mg content leads to the decrease in the lattice parameters of Ca3 Mg2Ni13-type compound, which may effectively improve the thermodynamics of hydrogen absorption-desorption. The enthalpy changes for the hydrogen absorption and desorption of Ca2Mg3Ni13 are -28 and 30 kJ/mol H2, respectively. Moreover, Ca2Mg3Ni13 shows good cycling stability because the hydrogen-induced amorphization and decomposition do not occur during hydrogen absorption-desorption cycles.