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PAC Studies of Ag-Hf Intermetallic Compounds

机译:Ag-Hf金属间化合物的PAC研究

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The hyperfine quadrupole interaction of ~(181)Ta and ~(111)Cd probes in HfAg and Hf_2Ag compounds was studied at 24 to 1100 K with the time -differential perturbed angular correlation (TDPAC) technique. The EFGs measured in HfAg on ~(181)Ta and ~(111)Cd are 1.388(5) x 10~(18) Vcm~(-2) and 0.340(5) x 10~(18) Vcm~(-2), respectively. For both probe atoms a linear decrease of the EFG with temperature was observed with slopes 1.11 (2) x 10~(-4) K~(-1) and 1.73 (5) x 10~(-4) K~(-1) for ~(181)Ta and ~(111)Cd, respectively. In Hf_2Ag, 0.469 (2) x 10~(18) Vcm~(-2) was determined on ~(181)Ta nuclei and 0.428 (5) x 10~(18) Vcm~(-2) on ~(111)Cd. Also a linear EFG temperature dependence with the large slope of 2.39 (6) x 10~(-4) K~(-1) was observed for ~(111)Cd probes in Hf_2Ag, while the EFG measured on ~(181)Ta nuclei in this compound exhibits a very weak temperature variation which can be fitted neither with a linear T nor a T~(3/2) dependence. In all cases the electronic contributions to the EFG are very small indicating that these transition element systems do not obey the universal correlation between the electronic and the ionic EFG observed in numerous other systems not belonging to the transition metal series.
机译:利用时差微扰角相关技术(TDPAC)研究了HfAg和Hf_2Ag化合物中〜(181)Ta和〜(111)Cd探针的超精细四极相互作用。在HfAg中〜(181)Ta和〜(111)Cd上测量的EFG为1.388(5)x 10〜(18)Vcm〜(-2)和0.340(5)x 10〜(18)Vcm〜(-2) ), 分别。对于两个探针原子,在斜率1.11(2)x 10〜(-4)K〜(-1)和1.73(5)x 10〜(-4)K〜(-1)下观察到EFG随温度线性下降。 )分别代表〜(181)Ta和〜(111)Cd。在Hf_2Ag中,在〜(181)Ta核上测得0.469(2)x 10〜(18)Vcm〜(-2),在〜(111)上测得0.428(5)x 10〜(18)Vcm〜(-2)。光盘。还观察到Hf_2Ag中〜(111)Cd探针的线性EFG温度依赖性具有2.39(6)x 10〜(-4)K〜(-1)的大斜率,而EFG在〜(181)Ta上测量该化合物中的核显示出非常弱的温度变化,其既不符合线性T也不符合T〜(3/2)依赖性。在所有情况下,对EFG的电子贡献都非常小,表明这些过渡元素体系没有遵守在不属于过渡金属系列的许多其他系统中观察到的电子和离子EFG之间的普遍相关性。

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