论文标题
混合价Pseudobrookite al $ _ {1.75} $ ti $ _ {1.25} $ o $ $ _5 $：高温相变，磁性和电阻率
Mixed Valence Pseudobrookite Al$_{1.75}$Ti$_{1.25}$O$_5$: High Temperature Phase Transitions, Magnetism and Resistivity
论文作者
论文摘要
Al $ _ {1.75}^{3+} $ ti $ _ {1.0}^{4+} $ ti $ _ {0.25}^{3+} $ o $ $ _5 $的深蓝色单晶获得的针头在伪原始的结构中结晶，并首先首先从原骨CMCM到C2/m，然后再进行C2对称性。就像已知的钛酸铝酸铝原子一样，也观察到了植物热膨胀。晶体结构的温度演变揭示了对导致Al $ _ {1.75} $ ti $ _ {1.25} $ o $ $ $ $ _5 $上高于725 $^\ circc $ c的机制的一些见解。讨论了磁性和电性能，并将其与其他报道的钛酸钛酸盐伪造物进行了比较。
Dark blue single crystals of Al$_{1.75}^{3+}$ Ti$_{1.0}^{4+}$ Ti$_{0.25}^{3+}$O$_5$ were grown with a novel synthesis method based on the reaction of a Ti3+/Ti4+ containing langbeinite melt and Al$_2$O$_3$. The obtained needles crystallize in the pseudobrookite structure and undergo two reversible phase transitions from orthorhombic Cmcm to C2/m first and subsequently to C2 symmetry. Like the known aluminum titanate pseudobrookites, anistropic thermal expansion is observed. The temperature evolution of the crystal structure reveals some insights into the mechanism leading to the decomposition of the Al$_{1.75}$Ti$_{1.25}$O$_5$ above 725$^\circ$C. The magnetic and electrical properties are discussed and compared to other reported aluminum titanate pseudobrookites.
