大晶粒铌材由于声子峰效应在2 K温度具有良好的热导, 这有助于提高超导腔的热稳定性。对宁夏东方钽业股份有限公司(OTIC)生产的大晶粒铌材在不同热处理条件下的热导和晶格缺陷开展了研究, 结果表明经过超过800 ℃的热处理, OTIC的大晶粒铌材能够恢复声子峰, 这与之前DESY的测量结果不同。认为用其加工的超导腔有望具备较好热稳定性。

Large grain niobium has good thermal conductivity at 2 K temperature because of the phonon peak, which is helpful to improve the thermal stability of superconducting cavities. The investigation into thermal conductivity and crystal imperfection of the large grain niobium material developed by Ningxia Orient Tantalum Industry Co., Ltd (OTIC) with different heat treatments has been carried out. Results show the phonon peak of OTIC large grain niobium can be recovered by heat treatment at a temperature of more than 800 ℃, which is different from previous measurements at DESY. In this paper we present the experiments, results and discussion of thermal conductivity investigation of OTIC large grain niobium.