α-LiIO3晶体的电子辐照效应

用透射电子显微镜观察了电子辐照对α-LiIO₃晶体结构的影响。α-LiIO₃经100keV能量中等强度的电子束辐照后,最初转变为γ-LiIO₃继而转变为Li₂O和另一种新的、可能是非化学比的Li—O化合物,称之新产物X。若用强电子束进行辐照,则α-LiIO₃迅速熔化。此时减弱电子束或停止辐照,均能使熔融物质凝固成上述新产物X,新产物X在电子束辐照下逐渐转变为Li₂O和金属锂。从新产物X转变为Li₂O的相变有一定程度的可逆性。此外发现,在电子束辐照下,α-LiIO₃单晶的结构变化有明显的各向异性。 关键词：

THE EFFECT OF ELECTRON IRRADIATION ON α-LITHIUM IODATE CRYSTAL STRUCTURE

The electron irradiation effects on the crystal structure of α-lithium iodate (α-LiIO₃) have been observed by TEM. Under the irradiation of medium-intense electron beam with energy 100 KeV, α-LiIO₃ transforms into γ-LiIO₃ at first and then into Li₂O and an other new type of Li-O compound which is probably a nonstoichiometric one and re-fered to as X compound. If the irradiation is carried out with more intense electron beam, α-LiIO₃ crystal melts quickly. In that case, either a decrease in intensity of electron beam or a break in irradiation leads to recrystallization of the melted substance in the form of X compound which gradually transforms into Li₂O and metal Li under subsequent electron irradiation. The phase tansformation form X compound into Li₂O is reversible to certain extent. Besides, it is found that the electron irradiation effects on the structure of α-lithium iodate monocrystal is clearly anisotropic.