Structure of Single-Crystal Rutile (TiO2) Prepared by High-Temperature Ultracentrifugation
Structure of Single-Crystal Rutile (TiO2) Prepared by High-Temperature Ultracentrifugation
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DOI：
10.1021/acs.cgd.6b01818
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发表时间：
2017-03
影响因子：
3.8
通讯作者：
T. Mashimo;Rabaya Bagum;Yudai Ogata;M. Tokuda;M. Okube;K. Sugiyama;Y. Kinemuchi;H. Isobe;A. Yoshiasa
中科院分区：
文献类型：
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作者：
T. Mashimo;Rabaya Bagum;Yudai Ogata;M. Tokuda;M. Okube;K. Sugiyama;Y. Kinemuchi;H. Isobe;A. Yoshiasa
本文报道了高温（强引力场）超离心法制备结构独特的单晶金红石（TiO2）。将单晶金红石沿C轴方向在400℃下施加0.4 × 106 G的重力场，并在常温条件下对不符合鲍林第三规则的结构独特的单晶金红石进行淬火。四方相的各向异性（a/c比）提高了2%。（Ti-Oa）/(Ti-Ob)和Os/Ou比值分别增加1.6%和3%，接近1；Ti-Oa和Ti-Ob分别为两个Ti-O原子间距离，Os和Ou分别为共享边Oa-Oa和非共享边Oa-Ob。这意味着TiO6八面体基团变成了各向同性。o在强大的引力作用下从正常大小膨胀，这与通常的定律是矛盾的。这种结构变化以前在高压或高温条件下是无法实现的，可能与结构…
We report the preparation of single-crystal rutile (TiO2) with a unique structure prepared by ultracentrifugation at high temperature (strong gravitational field). Single-crystal rutile was subjected along the c-axis direction to a gravitational field of 0.4 × 106 G at 400 °C, and the uniquely structured single-crystal rutile, which did not conform to Pauling’s third rule, was quenched at ambient conditions. The anisotropy (a/c ratio) of the tetragonal phase increased by 2%. The (Ti–Oa)/(Ti–Ob) and Os/Ou ratios increased by 1.6% and 3%, respectively, and approached 1; Ti–Oa and Ti–Ob are the two Ti–O interatomic distances, and Os and Ou are the shared edge Oa–Oa and the unshared edge Oa–Ob, respectively. This means that the TiO6 octahedral group became isotropic. Os was expanded from its normal size, in contradiction to the usual laws, by the strong gravitational force. Such a structural change has not previously been achieved under high-pressure or high-temperature conditions, and may be related to struc...