中文摘要：

通过化学气相沉积法直接在SiO2衬底上750℃裂解乙炔制备出直径约为3- 5μm，具有层状结构并含有大量缺陷的相互连接的石墨基碳微米球。结果表明：碳微米球除了表现出通常的抗磁性外，还表现出由于本征缺陷导致的未配对自旋而引起的顺磁性；这些缺陷提供自旋为1/2的磁矩；通过布里渊函数拟合得到，大约平均每1000个碳原子贡献出1.1μB的未配对自旋磁矩； 1/xp-T曲线表明这些未配对自旋之间并没有相互作用，样品表现出典型的居里型顺磁。

英文摘要：

Interconnected carbon micro-spheres （CMSs） with diameters in the range of 3 - 5 μm were synthesized by acetylene pyrolysis at 750 ℃ on a SiO： substrate. The CMSs have a graphitic structure with many intrinsic defects. Results indicate that the CMSs show both diamagnetic and paramagnetic behavior. Intrinsic defects have magnetic moments with spin 1/2. Approximately every 1,000 carbon atoms contribute 1.1 μB unpaired spins. The unpaired spins have no interactions with each other and show typical Curie-like paramagnetic behavior.