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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Mossbauer spectra of ~(167)Er and ~(166)Er in pyrogermanate and diglycollate hosts
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Mossbauer spectra of ~(167)Er and ~(166)Er in pyrogermanate and diglycollate hosts

机译：焦磷酸高锰酸根和二甘醇酸根中〜（167）Er和〜（166）Er的Mossbauer光谱

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摘要

The hyperfine splittings and the Mossbauer spectra (MS) of the two isomers ~(166)Er and ~(167)Er in the pyrogermanate (or ErPG) and diglycollate (or ErDG) hosts were calculated using the values of the crystal field (CF) parameters and energy levels obtained previously from fitting the magnetic and optical results. The calculated thermal characteristics of the quadrupole interaction parameter P di prominently for ErDG and ErPG in both the isomers. viz., for ~(166)Er in ErDG the value of P increased from 1.5 to 21.3MHz between 300 and 4K. whereas in ErPG the corresponding change is insignificant approx1 MHz. It was also found that the excited nuclear level of 16 both the compounds split into five doublets giving rise to a five finger pattern in the calculated MS as have been observed for Er~(3+) in several other compounds. In case of the 167 isomer more complicated MS far ErDG and ErPG are expected. Due to the non-zero value of the hyperfine constant B in case of ErPG the nuclear wave functions have mixed components of m_I which affected the intensity of the spectra. The hyperfine magnetic fields H_(hf) were calculated for both the compounds and were found to be nearly the same, being equal to 4.4+-0.1 MG. The hyperfine specific heat C_(hf) were calculated for ~(167)Er in both hosts and was found that T~2C_(hf) attained constant values at millikelvin temperature. This study showed that MS and C_(hf) of ErDG and ErPG are expected to be quite sensitively affected by the anomalous behaviours observed in these compounds at low temperatures.
机译：使用结晶场（CF）的值计算了高锰酸根（或ErPG）和二甘醇酸酯（或ErDG）主体中〜（166）Er和〜（167）Er的两个异构体的超细分裂和Mossbauer光谱（MS） ）参数和能级，以前是通过拟合磁和光结果获得的。在两种异构体中，对于ErDG和ErPG，计算出的四极相互作用参数P di的热特性显着。即，对于ErDG中的〜（166）Er，P值在300至4K之间从1.5MHz增加到21.3MHz。而在ErPG中，相应的变化约为1 MHz。还发现，正如在其他几种化合物中对Er〜（3+）所观察到的那样，两种化合物的16种激发核能水平分裂成五个双峰，从而在计算的MS中产生了五指模式。在167个异构体的情况下，更复杂的MS有望获得ErDG和ErPG。由于在ErPG情况下超精细常数B的非零值，因此核波函数具有m_I的混合分量，这会影响光谱的强度。计算出两种化合物的超精细磁场H_（hf），发现它们几乎相同，等于4.4±0.1 MG。计算了两个宿主中〜（167）Er的超细比热C_（hf），发现T〜2C_（hf）在毫ikelvin温度下达到恒定值。这项研究表明，预计在低温下这些化合物中观察到的异常行为会非常敏感地影响ErDG和ErPG的MS和C_（hf）。

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