Nature of the surface layer in ABO3-type perovskites at elevated temperatures
Nature of the surface layer in ABO3-type perovskites at elevated temperatures
复制标题
DOI：
10.1007/bf01594231
复制
发表时间：
1996-03
期刊：
影响因子：
--
通讯作者：
K. Szot;M. Pawełczyk;J. Herion;C. Freiburg;J. Albers;Rainer Waser;J. Hulliger;J. Kwapuliński;J. Dec
中科院分区：
文献类型：
--
作者：
K. Szot;M. Pawełczyk;J. Herion;C. Freiburg;J. Albers;Rainer Waser;J. Hulliger;J. Kwapuliński;J. Dec
X射线衍射测量表明，在钙钛矿结构的表层中，BaTiO3、SrTiO3、PbTiO3和KNbO3晶体在高温（500-1000°C）下发生固相反应，并与AO配合物表面方向的偏析相关，导致形成通式为AO·(ABO3)n,n=l的整个同系物系列晶体化合物， 2,....., 10, ∞ 降低的氧分压可能会抑制分离过程，并且在 AO 络合物尚未从表面蒸发的温度范围内，适当选择氧分压可能会导致化合物的重新合成。
X-ray diffraction measurements showed that in the surface layer of perovskite structure BaTiO3, SrTiO3, PbTiO3and KNbO3crystals at elevated temperatures (500–1000°C) reactions take place in the solid phase, associated with segregation in the direction to the surface of AO complexes, leading to the formation of a whole homologue series of crystalline compounds with the general formula AO · (ABO3)n,n= l, 2,....., 10, ∞ Lowered oxygen partial pressure may inhibit the segregation processes and in the range of temperatures for which vaporisation of the AO complexes from the surface does not yet take place a suitable choice of oxygen pressure may lead to resynthesis of the compound.