Synthesis, lattice parameter changes, grain morphology, superconductivity and specific heat of a new superconductor Nb1-xMgxB2 (0.0 <= x <= 0.40) series were reported. Magnetization and resistance measurements indicate that the superconducting transition temperature T-C of Nb1-xMgxB2 with x = 0.10-0.40 is similar to 5 K. A large Meissner signal and the result of specific heat measurements indicate that the superconductors have a bulk superconductivity. The Debye temperature theta(D) determined by the measurement of specific heat is 419(+/- 10) K for Nb0.75Mg0.25B2.
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机译：报告了新型超导体Nb1-xMgxB2（0.0 <= x <= 0.40）系列的合成，晶格参数变化，晶粒形态，超导性和比热。磁化强度和电阻测量结果表明Nb1-xMgxB2的超导转变温度T-C（x = 0.10-0.40）类似于5K。大的迈斯纳信号和比热测量的结果表明，超导体具有体超导性。对于Nb0.75Mg0.25B2，通过比热测量确定的德拜温度theta（D）为419（+/- 10）K。
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