Bespalko Yuliya, Eremeev Nikita, Sadovskaya Ekaterina, Krieger Tamara, Bulavchenko Olga, Suprun Evgenii, Mikhailenko Mikhail, Korobeynikov Mikhail, Sadykov Vladislav
Federal Research Center, Boreskov Institute of Catalysis SB RAS, Novosibirsk, Akad. Lavrentieva Ave. 5, 630090 Novosibirsk, Russia.
Institute of Solid State Chemistry and Mechanochemistry SB RAS, Kutateladze Str. 18, 630128 Novosibirsk, Russia.
Membranes (Basel). 2023 Jun 13;13(6):598. doi: 10.3390/membranes13060598.
Synthesis and study of materials based on bismuth cerates and titanates were carried out. Complex oxides BiYTiO were synthesized by the citrate route; BiCeO and BiYCeO-by the Pechini method. The structural characteristics of materials after conventional sintering at 500-1300 °C were studied. It is demonstrated that the formation of a pure pyrochlore phase, BiYTiO, occurs after high-temperature calcination. Complex oxides BiCeO and BiYCeO have a pyrochlore structure formed at low temperatures. Yttrium doping of bismuth cerate lowers the formation temperature of the pyrochlore phase. As a result of calcination at high temperatures, the pyrochlore phase transforms into the CeO-like fluorite phase enriched by bismuth oxide. The influence of radiation-thermal sintering (RTS) conditions using e-beams was studied as well. In this case, dense ceramics are formed even at sufficiently low temperatures and short processing times. The transport characteristics of the obtained materials were studied. It has been shown that bismuth cerates have high oxygen conductivity. Conclusions are drawn about the oxygen diffusion mechanism for these systems. The materials studied are promising for use as oxygen-conducting layers in composite membranes.
开展了基于铋铈酸盐和钛酸盐材料的合成与研究。采用柠檬酸盐法合成了复合氧化物BiYTiO；采用佩琴尼法合成了BiCeO和BiYCeO。研究了材料在500 - 1300°C常规烧结后的结构特征。结果表明，高温煅烧后会形成纯的烧绿石相BiYTiO。复合氧化物BiCeO和BiYCeO具有在低温下形成的烧绿石结构。铋铈酸盐的钇掺杂降低了烧绿石相的形成温度。高温煅烧的结果是，烧绿石相转变为富含氧化铋的CeO类萤石相。还研究了使用电子束的辐射热烧结（RTS）条件的影响。在这种情况下，即使在足够低的温度和较短的加工时间下也能形成致密陶瓷。研究了所得材料的传输特性。结果表明，铋铈酸盐具有高氧导率。得出了这些体系的氧扩散机制的结论。所研究的材料有望用作复合膜中的氧传导层。
