<p>The present thesis deals with the investigation of some perovskite related complex cobaltates. The phases Sr<sub>2</sub>Co<sub>2-x</sub>Ga<sub>x</sub>O<sub>5</sub> (0.3 ≤ x ≤ 0.7), Sr<sub>2</sub>Co<sub>2-x</sub>Al<sub>x</sub>O<sub>5</sub> (0.3 ≤ x ≤ 0.5), Sr<sub>1-x</sub>Bi<sub>x</sub>CoO<sub>3-y</sub> (0.1 ≤ x ≤ 0.2), Sr<sub>0.75</sub>Y<sub>0.25</sub>Co<sub>1-x</sub>GaxO<sub>2.625</sub> (0.125 ≤ x ≤ 0.375) and Sr<sub>0.75</sub>Y<sub>0.25</sub>Co<sub>1-x</sub>FexO<sub>2.625+δ</sub> (0.125 ≤ x ≤ 0.625) were synthesised and characterised. All these compounds crystallises with similar structures, they are all composed by altering layers of octahedra and tetrahedra although in the two former, the tetrahedra are organised in chains (the Brownmillerite structure), while in the latter three the tetrahedra arranges as segregated Co<sub>4</sub>O<sub>12 </sub>units (the 314 type structure). The techniques X-ray and neutron diffraction, transmission electron microscopy, thermal analysis and magnetic measurements were used to track structural and important physical properties.</p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:su-1047 |
| Date | January 2006 |
| Creators | Lindberg, Fredrik |
| Publisher | Stockholm University, Department of Physical, Inorganic and Structural Chemistry, Stockholm : Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Doctoral thesis, comprehensive summary, text |
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