PHASE TRANSFORMATIONS IN FORMATION OF FIVELAYER PEROVSKITES Ca5–xSrxTiNb4O17 (x = 0-5) FROM COPRECIPITATED HYDROXOCARBONATE SYSTEMS

We have determined the characteristic features of the formation of five-layer perovskites Ca5.xSrxTiNb4O17 (x = 0-5) from systems of coprecipitated hydroxocarbonates. We have established that the sequence of formation for their crystal structure depends on the composition and nature of the products obtained, and is different for the individual compounds Ca5TiNb4O17, Sr5TiNb4O17, and the phases Ca5.xSrxTiNb4O17 (x = 1-4).