Structure refinement of polycrystalline orthorhombic yttrium substituted calcium titanate: Ca1−ð�?�¥Y𝑥TiO3+ð›�? (ð‘�? = 0.1â€�??0.3)

Bulletin of materials science

O P Shrivastava¹  Rashmi Chourasia¹ 

[1] Department of Chemistry, Dr H.S. Gour University, Sagar 470 003, India$$Department of Chemistry, Dr H.S. Gour University, Sagar 470 003, IndiaDepartment of Chemistry, Dr H.S. Gour University, Sagar 470 003, India$$

关键词: Perovskites;    powder X-ray diffraction;    Rietveld refinement;    GSAS;    nanoceramic.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The perovskite ceramic phases with composition Ca_{1−ð�?��?}Y_ð‘�?TiO_{3+ð›�?} (where ð‘�? = 0.1, 0.2 and 0.3; hereafter CYT-10, CYT-20 and CYT-30) have been synthesized by solid state reaction at 1050°C. The structure refinement using general structure analysis system (GSAS) software converges to satisfactory profile indicators such as Rietveld parameters: Rp, R_wp, RF² and goodness of fit. The title phases crystallize at room temperature in the space group 𝑃ð�?�ð�?��?�ð�?��? (#62) with ð‘�? = 5.3741(4) Ã�?, ð‘�? = 5.4300(4) Ã�?, ð‘�? = 7.6229(5) Ã�? and ð‘�? = 4. Major interatomic distances, bond angles and structure factors have been calculated from the step analysis data of the compound. The crystal morphology has been examined by scanning electron microscopy. Energy dispersive X-ray (EDX) analysis of the specimens show that yttrium enters into the structural framework of CaTiO₃. The particle size of the ceramic phases along major reflection planes ranges between 12 and 40 nm. The polyhedral (CaO₈ and TiO₆) distortions and valence calculations from bond strength data are also reported.

【 授权许可】

Unknown