New commensurate phases in the family (A3Co2O6)α(A3Co3O9)β (A = Ca, Sr, Ba)
New commensurate phases in the family (A3Co2O6)α(A3Co3O9)β (A = Ca, Sr, Ba)
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DOI：
10.1021/cm991028g
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发表时间：
2000-01-01
影响因子：
8.6
通讯作者：
González-Calbet, JM
中科院分区：
文献类型：
--
作者：
Boulahya, K;Parras, M;González-Calbet, JM
在A- co - o体系中分离出具有一维结构的新相（A = Ca, Sr, Ba），并用电子衍射和高分辨率电子显微镜对其进行了表征。（Ca0.4Sr0.6）(9)Co7O21, Sr14Co11O33, Sr21Co17O51， Ba15Co13O39和Ba66Co59O177是一个同源的通式(A(3)Co(2)O(6))(α)(A(3)Co(3)O(9))（β）的成员。它们都是由限制该系列的相：Ca3Co2O6和2H-BaCoO3的结构框架的有序互长构成的。该系列的所有成员都是由调制向量k = (a*(2H) + b*(2H))/3 + m2c*(2H)导出的相称相位，其中m与数字α和β有关，因此；直接给出A/Co比率。从HREM图像中可以明确地获得有序的块序列。
New phases with one-dimensional structures in the A-Co-O system (A = Ca, Sr, Ba) have been isolated and characterized by electron diffraction and high-resolution electron microscopy. (Ca0.4Sr0.6)(9)Co7O21, Sr14Co11O33, Sr21Co17O51, Ba15Co13O39, and Ba66Co59O177 are members of an homologous series of general formula (A(3)Co(2)O(6))(alpha)(A(3)Co(3)O(9))(beta). All Of them are constituted by the ordered intergrowth of structural frames of the phases limiting this series: Ca3Co2O6 and 2H-BaCoO3. All of the members of this series are commensurate phases derived by a modulation vector k = (a*(2H) + b*(2H))/3 + m2c*(2H), with m being related to the numbers alpha and beta and, consequent;ly, giving directly the A/Co ratio. The ordered succession of blocks can unambiguously be obtained from the HREM images.