Ca3-xMg2+xNi13合金的储氢性能 |
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引用本文: | 张庆安,赵刚,斯庭智,庞刚.Ca3-xMg2+xNi13合金的储氢性能[J].中国材料进展,2009,28(5). |
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作者姓名: | 张庆安 赵刚 斯庭智 庞刚 |
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作者单位: | 安徽工业大学材料科学与工程学院,安徽,马鞍山,243002 |
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摘 要: | 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.
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关 键 词: | 金属间化合物 晶体结构 储氢 |
Hydrogen Storage Properties of Ca3-x Mg2+xNi13 Alloys |
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Authors: | ZHANG Qing'an ZHAO Gang SI Tingzhi PANG Gang |
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Abstract: | 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. |
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Keywords: | intermetallic compound crystal structure hydrogen storage |
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