By using Tb407 and MoO3 as starting materials, ferroelectric Tb2（MoO4）3 crystal was grown by the Czochralski method. The as-grown crystal was pale green color, transparent and crack-free. X-ray powder diffraction （...By using Tb407 and MoO3 as starting materials, ferroelectric Tb2（MoO4）3 crystal was grown by the Czochralski method. The as-grown crystal was pale green color, transparent and crack-free. X-ray powder diffraction （XRPD）, transmission spectrum, dielectric constant and polarization-electric field （P-E） hysteresis loop measurements were performed to characterize the crystal. The XRPD confirmed the as-grown crystal to be Tb2（MoO4）3. The transmission spectrum of the crystal showed that its transmittance in the entire visible and most near-infrared region was more than 70% except for an absorption peak around 486 nm. Obvious dielectric anomaly could be observed at low frequencies with increasing temperature through the dielectric constant measurement and the Curie temperature of Tb2（MoO4）3 crystal was determined to be 162.3℃ The unsaturated P-E hysteresis loops indicated that it was difficult for the ferroelectric domains in Tb2（MoO4）3 crystal to array regularly with repeated switching of the electric field.展开更多
In this paper a new solid superacid catalyst SO 2- 4 MoO 3 TiO 2 was prepared.The activity of the catalyst in esterification of acetic acid and iso amyl alcohol was measured and compared with that of SO 2- 4 TiO 2 and...In this paper a new solid superacid catalyst SO 2- 4 MoO 3 TiO 2 was prepared.The activity of the catalyst in esterification of acetic acid and iso amyl alcohol was measured and compared with that of SO 2- 4 TiO 2 and MoO 3 TiO 2.The results showed that SO 2- 4 MoO 3 TiO 2 had better catalytic performance than SO 2- 4 TiO 2 and MoO 3 TiO 2.There was evident coordination between MoO 3 and SO 2- 4 when they coexisted on TiO 2.展开更多
基金National Natural Science Foundation of China(12175254,U1832119)National Key R&D Program of China(2021YFE0104800)+2 种基金International Partnership Program of Chinese Academy of Sciences(121631KYSB20200039)International Cooperation Project of Shanghai Science and Technology Commission(20520750200)National Centre for Research and Development(WPC2/1/SCAPOL/2021)。
基金supported by the National Natural Science Foundation of China (50590401)
文摘By using Tb407 and MoO3 as starting materials, ferroelectric Tb2（MoO4）3 crystal was grown by the Czochralski method. The as-grown crystal was pale green color, transparent and crack-free. X-ray powder diffraction （XRPD）, transmission spectrum, dielectric constant and polarization-electric field （P-E） hysteresis loop measurements were performed to characterize the crystal. The XRPD confirmed the as-grown crystal to be Tb2（MoO4）3. The transmission spectrum of the crystal showed that its transmittance in the entire visible and most near-infrared region was more than 70% except for an absorption peak around 486 nm. Obvious dielectric anomaly could be observed at low frequencies with increasing temperature through the dielectric constant measurement and the Curie temperature of Tb2（MoO4）3 crystal was determined to be 162.3℃ The unsaturated P-E hysteresis loops indicated that it was difficult for the ferroelectric domains in Tb2（MoO4）3 crystal to array regularly with repeated switching of the electric field.
文摘In this paper a new solid superacid catalyst SO 2- 4 MoO 3 TiO 2 was prepared.The activity of the catalyst in esterification of acetic acid and iso amyl alcohol was measured and compared with that of SO 2- 4 TiO 2 and MoO 3 TiO 2.The results showed that SO 2- 4 MoO 3 TiO 2 had better catalytic performance than SO 2- 4 TiO 2 and MoO 3 TiO 2.There was evident coordination between MoO 3 and SO 2- 4 when they coexisted on TiO 2.
