The characteristics of Cu-doped lead apatite (LK-99) synthesized with the removal of Cu2S using ammonia solution: A diamagnetic semiconductor-Reference-Cited by-同舟云学术

The characteristics of Cu-doped lead apatite (LK-99) synthesized with the removal of Cu2S using ammonia solution: A diamagnetic semiconductor

Published:2024-02-01 Issue:2 Volume:12 Page:
ISSN:2166-532X
Container-title:APL Materials
language:en
Short-container-title:

Author:

Lei Zhujialei¹,Lin Chin-Wei¹,Chen I-Nan²^ORCID,Chou Chun-Tse¹^ORCID,Lin Yen-Lin¹,Chen Jau-Han³^ORCID,Sung Huang-Huei³^ORCID,Wang Li-Min¹^ORCID

Affiliation:

1. Department of Physics/Graduate Institute of Applied Physics, National Taiwan University 1 , Taipei 106, Taiwan

2. Instrumentation Center, National Taiwan University 2 , Taipei 106, Taiwan

3. Department of Materials Science and Engineering, Da-Yeh University 3 , Changhua 515, Taiwan

Abstract

This study evaluated the superconducting properties of Cu-doped lead apatite “LK-99” and synthesized LK-99 samples using the process proposed by a team from Korea, who first described the process. Additionally, whether the results of this Korean team were related to Cu2S was also examined using an ammonia solution (NH3·H2O) to remove Cu2S. Through x-ray diffraction (XRD) and energy dispersive x-ray spectroscopy (EDX) analyses, a distinct Cu2S phase was identified in the LK-99 samples. This phase was effectively eliminated through a subsequent treatment using an ammonia solution. The appearance of blue Cu+2 ions in the solution and the elimination of the Cu2S peak in XRD supported the conclusion. The magnetic and electrical properties of LK-99 with and without Cu2S suggest that the superconductor-like behavior in LK-99 predominantly arises from a transition in resistivity due to the influence of Cu2S. As such, LK-99 is better classified as a diamagnetic semiconductor than a room-temperature superconductor. The room-temperature superconductors still require further research.

Funder

National Science and Technology Council

Publisher

AIP Publishing

Subject

General Engineering,General Materials Science

Link

https://pubs.aip.org/aip/apm/article-pdf/doi/10.1063/5.0183271/19333196/021104_1_5.0183271.pdf

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