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非晶La80Al20晶化相的超导电性
SUPERCONDUCTIVITY OF CRYSTALLIZED PHASES FROM AMORPHOUS La80Al20
【摘要】 本文把非晶La80Al20在真空中、不同温度及时间条件下进行退火,以及在6GPa不同温度退火40min,并对退火样品的相结构及超导性进行了研究。发现真空中,250℃退火的样品晶化成了T>4.2K,不超导的单相四方La4Al;300℃及450℃退火的样品晶化成La3Al,α-La、β-La及一些未知杂相,这些多相混合物的Tc<6.0K。在6GPa 300℃及以下温度退火的样品,晶化成单相六角La4Al,其晶格常数与六角La3Al的完全相同,这些样品的Tc>5.1K;6GPa、350℃及以上温度退火的样品,晶化成La3Al相及新未知相H,新相H的Tc为6.3K。
【Abstract】 In this paper, we studied the structures and superconductivity of the samples annealed from amorphous La80Al20 alloy under different treatments. It was found that when annealed in vacuum at 250℃, the amorphous alloy crystallized into the sampleof a tetragonal single phase La4Al for which there is no Tc as T>4. 2 K . When annealed in vacuum at 300℃, or 450℃, the amorphous samples crystallized into the samples of hexagonal La3Al, α-La, β-La and some unknown phases, the Tc of these multiphase samples is lower than 6.OK. When annealed under 6GPa, if annealing temperature Ta≤300℃, the amorphous alloy crystallized into the sample of hexagonal La4Al, the parameters of which are exactly the same as hexagonal La3Al and Tc of which is lower than 5.7K; if Ta≥350℃, the amorphous alloy crystallized into the sample of hexagonal La3Al and a unknown phase H, the Tc of new phase H is 6.3K.
- 【文献出处】 高压物理学报 ,Chinese Journal of High Pressure Physics , 编辑部邮箱 ,1987年02期
- 【被引频次】1
- 【下载频次】25