The tetragonal phase of pbtio3 is very stable owing to its large tetragonal strain , and relatively small tetragonal stain of batio3 is an important reason for its low - temperature phase transition 由于钛酸铅具有较大的四方应变,使得其能够在四方相稳定下来,而钛酸钡较小的四方应变是其仍能够发生低温铁电相变的一个重要原因。
Below 280k the degenerated states were relieved and the electrons turned to the ordered states from the disordered , leading to the resistance increase suddenly and the transition from the cubic to the tetragonal structure 280k以后, mn原子轨道电子态的简并被解除,电子由无序向有序状态转变,电阻随温度的降低,急剧增加,材料结构由立方相向四方相转变。
Alloy fabricated by arc melting consists of continuous nbssi matrix and dispersive distributed nb particles . the metastable nbasi phase is found to have a tetragonal crystal structure with space group p42 / n and lattice parameters a = 1 . 021nm , c = 0 . 519nm O 0 )金属间化合物的显微组织由连续的nb3si基体、弥散分布的nb粒子组成,其中亚稳态相nb3si为四方结构,空间群p42 n ,点阵常数a l
Based on recent published research , explanation about the experimental results was also given . remanent polarization and coercive field decreased with the increasing of la content . the crystal structure transformed from tetragonal to cubic when la concentration increased to 28mol % 在薄膜的铁电性质方面,随着掺镧含量的升高,剩余极化和矫顽场逐渐降低;当镧含量达到28mol时薄膜的结构从四方相转变到立方相。
Traditionally it is considered that particles are formed into the single - chain structure , while the body - centered tetragonal ( bct ) structure comes into being when the particle volume is a little high . and the other structure models such as the layer model , the fiber model , the column model and so on 粒子发生聚集所形成的结构传统的认为是单链模型,而当粒子的体积浓度比较大时,一般认为是体心四方结构(即bct模型) ,此外还有诸如层结构模型、纤维结构模型、圆柱结构模型等等。