The sp ²–sp ³-hybridized carbon allotropes with the advantage of two hybrid structures possess rich and fascinating electronic and mechanical properties and they have received long-standing attention. We design a class of versatile sp ²–sp ³ carbons composed of graphite and diamond structural units with variable sizes. This class of sp ²–sp ³ carbons is energetically more favorable than graphite under high pressure, and their mechanical and dynamical stabilities are further confirmed at ambient pressure. The calculations of band structure and mechanical properties indicate that this class of sp ²–sp ³ carbons not only exhibits peculiar electronic characteristics adjusted from semiconducting to metallic nature but also presents excellent mechanical characteristics, such as superhigh hardness and high ductility. These sp ²–sp ³ carbons have desirable properties across a broad range of potential applications.

sp ² - sp ³杂化碳同素异形体具有两种杂化结构的优势，具有丰富而引人入胜的电子和机械性能，长期以来一直受到关注。我们设计了一类多功能的sp ² - sp ³碳，由石墨和金刚石结构单元组成，尺寸可变。这类sp ² - sp ³碳在高压下在能量上比石墨更有利，并且在环境压力下进一步证实了它们的机械和动态稳定性。能带结构和力学性能的计算表明，这类sp ² - sp ³碳不仅表现出从半导体性质到金属性质的特殊电子特性，而且表现出优异的机械特性，如超高硬度和高延展性。这些sp ² – sp ³碳在广泛的潜在应用中具有理想的特性。