원문정보
초록
영어
Recently, a claim of material, named LK-99 (a lead apatite-based compound), exhibiting a superconducting transition temperature of over 400 K under standard atmospheric pressure, was reported [1, 2]. This claim has generated considerable attention from scientists worldwide. Here, we synthesized five LK-99 samples following the method detailed in the original papers [1, 2], and measured structural and resistivity data for each of these samples. The structure of the synthesized samples (P63/m, a=9.82 Å , c=7.34 Å ) was very close to the reported one. Contrary to the report, however, no hint of room-temperature superconductivity was noted from any of the samples. The results of Energy-dispersive X-ray spectroscopy (EDXS) measurements demonstrate that the atomic distribution in the sample was inhomogenous, and unreacted precursors were included in the samples. To investigate the intrinsic superconducting properties of LK-99, we propose to synthesize samples having high structural purity and chemical uniformity.
목차
1. INTRODUCTION
2. SAMPLE PREPARATION
2.1. 라나카이트 (Lanarkite), Pb2SO5 합성
2.2. 구리인화물 (Copper Phosphide), Cu3P 합성
2.3. LK-99 합성
3. RESULTS AND DISCUSSION
3.1. 구조 측정 결과
3.2. 전기저항 측정 결과
4. CONCLUSION
ACKNOWLEDGMENT
REFERENCES