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1 000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.
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