中文摘要：

为观察MgO在MgB2超导样品中的影响和存在形式,通过在MgB2胚体样品之外,增加周围MgO量的实验方法,经过4 h 750℃的烧结,在制备好的MgB2超导样品内得到了壁厚是约4纳米,直径在50～80纳米,长为30～40微米以上的氧化镁（MgO）纳米管.在MgB2样品表面可以看到少量直径是200～300纳米的氧化镁（MgO）亚微米线.经过扫描电镜的能量损失谱和透射电镜EELS分析测量,证明了纳米管中没有硼元素.实验观测也表明这些氧化镁（Mgo）纳米管是由许多氧化镁（MgO）纳米晶片组成.

英文摘要：

In order to observe the influence and the existence of MgO in MgB2 superconductor samples, the extra MgO was introduced around the MgB2 embryo. After sintered the sample for 4 hours at 750℃, the nano-MgO tubes, with diameter are 50 ～ 80 nanometers, lengths are 30 ～ 40μm, and wall thickness are about 4 nanometers, were obtained in the MgB2 sample, There is some nano-MgO fibers with diameters are 200 ～300 nanometers existed on the sample surface. They are sub-micron wires. By the SEM EELS survey and TEM EELS analysis, we can confirm that the nano-MgO tubes do not contain B. And the experiment observation also indicated that the nano-MgO tubes constitute of many MgO nanometer crystal pieces. So nano-MgO tubes are polycrystalline.