不同碱金属叠氮化物对层状晶体β-MNCl(M=Zr,Hf)电子掺杂的影响
Electron-Doping by Different Alkali Azides in Layer-Structured Crystals of β-MNCl(M=Zr,Hf)
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摘要: 通过使用各种不同的碱金属叠氮化物RN3(R=Li,Na,K,Rb)与层状晶体β-MNCl(M=Zr,Hf)发生反应,并控制RN3与β-MNCl反应的摩尔比对β-MNCl进行电子掺杂.所有的生成物都显示了超导性,β-ZrNCl系列的起始超导转变温度均为13.5 K,而β-HfNCl系列的起始超导转变温度均为 23.5 K.但是,不同的碱金属叠氮化物具有不同的可反应性,其反应产物也具有不同的性质,例如超导体积百分率、晶格常数、热稳定性和在空气中的稳定性等都和碱金属离子有关.SQUID测试结果表明,NaN3和KAbstract: Layer-structured crystals of β-MNCl (M=Zr,Hf) could be electron-doped by reactions with different alkali metal azides RN3 (R=Li,Na,K,Rb), and controlling the amounts with the molar ratios of azides to β-MNCl. All the prepared compounds show superconductivity with the same transition temperatures at 13.5 K for β-ZrNCl and 23.5 K for β-HfNCl. However the different alkali metal azides RN3 show different reactivity with β-MNCl, and the properties of the products such as superconducting fractions, the lattice constant, and stability against thermal or air, are very dependent on the kinds of alkali metals used. Based on the the results of SQUID measurements, it can be concluded that NaN3 and KN3 are the best react agents for β-ZrNCl and β-HfNCl respectively.
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