摘要：
<jats:p>The influence of barium doping on the oxygen-ion diffusion and phase transition in the La<jats:sub>2</jats:sub>Mo<jats:sub>2</jats:sub><jats:sub>-</jats:sub><jats:sub>y</jats:sub>W<jats:sub>y</jats:sub>O<jats:sub>9</jats:sub><jats:sub>-</jats:sub><jats:sub>δ</jats:sub> (y=0, 1.0) oxide-ion conductors has been systematically investigated via dielectric techniques. In the Ba-doped La<jats:sub>2</jats:sub>Mo<jats:sub>2</jats:sub>O<jats:sub>9</jats:sub> samples there are only two dielectric relaxation peaks P<jats:sub>d1</jats:sub> and P<jats:sub>d2</jats:sub>, which are associated with the short-distance diffusion of oxygen vacancies. But in the Ba-doped La<jats:sub>2</jats:sub>MoWO<jats:sub>9</jats:sub> members, three peaks are detected, including peak P<jats:sub>d1</jats:sub>, P<jats:sub>d2</jats:sub>, and peak P<jats:sub>h</jats:sub>. The last is associated with the phase transition process from the static disordered state to the dynamic disordered state of oxygen ion/vacancy distribution.</jats:p>
摘要：
This paper studies the synchronization and anti-synchronization problem of the Three-Scroll Unified Chaotic System (TSUCS), which has nonlinear terms in each subsystem. By virtue of active control, a novel active pinning control strategy is presented, which only needs one or two states of the TSUCS. Under the proposed controller, the synchronization of two TSUCS with parametric uncertainty is achieved and therefore the robust stability of TSUCS synchronization is ensured. Some stability theories about synchronization and anti-synchronization have been given and proved the use of this class of a novel TSUCS and its hyper-unified chaotic system with the active pinning control strategy. Numerical simulations are given to verify the theoretical analysis, which clearly shows that the control strategy can really make the chaotic systems achieve synchronization and anti-synchronization in a quite short time.
摘要：
<jats:p>(Sr<jats:sub>2</jats:sub>FeMoO<jats:sub>6</jats:sub>)<jats:sub>1-x</jats:sub>/(CeO<jats:sub>2</jats:sub>)<jats:sub>x</jats:sub>composites with nanosized crystallite were prepared by Sr<jats:sub>2</jats:sub>FeMoO<jats:sub>6</jats:sub>obtained from the sol-gel method and nanosized CeO<jats:sub>2</jats:sub>powders. The magnetoresistance of composites increase with the CeO<jats:sub>2</jats:sub>increasing. And the MR ratio at 10 K is 1.23%, and 2.48% for the x = 0.05 and 0.2 samples with H = 1 kOe, which are 1.25 times and 2.53 times as large as that for pure Sr<jats:sub>2</jats:sub>FeMoO<jats:sub>6</jats:sub>, respectively. The enhanced magnetoresistance was attributed to the spin-dependent tunneling at the interface of grain boundaries.</jats:p>
摘要：
The effects of tungsten doping on the oxygen-ion diffusion and the phase transition in La2Mo2-xWxO9 samples (x = 0.5, 0.75, 1.0, 1.2) were studied using internal friction method. The results show that two peaks were detected in the internal friction-temperature spectra in the La2Mo2-xWxO9 samples, the low-temperature relaxation peak is associated with oxygen ion diffusion, and the high-temperature peak is associated with a phase transition from the static disordered state to the dynamic disordered state of oxygen ion/vacancy distribution.
摘要：
The reducibility of oxide-ion conductors La2Mo2-Ywyo9(y=0, 0.1) were studied in the reducing atmosphere of 5%H2+Ar by means of impedance spectroscopy measurement. 5% W-doped La2Mo2-Ywyo9 can enhance the conductivity and improve the reducibility in the temperature range from 275oC to 650oC.
摘要：
<jats:p>In this paper, the ceramic samples of La<jats:sub>2</jats:sub>Mo<jats:sub>2</jats:sub>O<jats:sub>9</jats:sub>and La<jats:sub>2</jats:sub>Mo<jats:sub>2-x</jats:sub>Ga<jats:sub>x</jats:sub>O<jats:sub>9-δ</jats:sub>(x=0.1,0.2)were prepared by conventional solid-state reaction method. The reducibility of pure La2Mo2O9 and La<jats:sub>2</jats:sub>Mo<jats:sub>2-x</jats:sub>Ga<jats:sub>x</jats:sub>O<jats:sub>9-δ</jats:sub>(x=0.1,0.2) samples were studied in the reducing atmosphere of 5%H2+Ar by means of impedance spectroscopy measurement. For the La<jats:sub>2</jats:sub>Mo<jats:sub>2-x</jats:sub>Ga<jats:sub>x</jats:sub>O<jats:sub>9-δ</jats:sub>(x=0.1,0.2) the difference between the conductivity in the reducing atmosphere and the one in air is small, indicating that partial substitution of Ga for Mo is effective to improve the reducibility of La<jats:sub>2</jats:sub>Mo<jats:sub>2-x</jats:sub>Ga<jats:sub>x</jats:sub>O<jats:sub>9-δ</jats:sub>(x=0.1,0.2).</jats:p>
摘要：
<jats:p>The reducibility of oxide-ion conductors La<jats:sub>2-x</jats:sub>Ba<jats:sub>x</jats:sub>Mo<jats:sub>2-y</jats:sub>W<jats:sub>y</jats:sub>O<jats:sub>9-δ</jats:sub>(x = 0, 0.06; y = 0, 0.1) were studied in the reducing atmosphere of 5%H2 + Ar by means of impedance spectroscopy measurement.. All substitutions can enhance the conductivity and improve the reducibility in the temperature range from 548 to 923 K. The double substitution of Ba and W has a better stabilizing effect than the single tungsten substitution.</jats:p>
