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In this article we present a neutron diffraction in-situ study of the thermalevolution and high-temperature structure of layered cobaltites Y(Ba, Sr)Co2O5+{\delta}. Neutron thermodiffractograms and magnetic susceptibilitymeasurements are reported in the temperature range 20 K <= T <= 570 K, as wellas high resolution neutron diffraction experiments at selected temperatures.Starting from the as-synthesized samples with {\delta} ~ 0.5, we show that theroom temperature phases remain stable up to 550 K, where they start loosingoxygen and transform to a vacancy-disordered "112" structure with tetragonalsymmetry. Our results also show how the so-called "122" structure can bestabilized at high temperature (around 450 K) in a sample in which the additionof Sr at the Ba site had suppressed its formation. In addition, we present thestructural and magnetic properties of the resulting samples with a new oxygencontent {\delta} ~ 0.25 in the temperature range 20 K <= T <= 300 K.

High temperature behavior of Sr-doped layered cobaltites Y(Ba1-xSrx)Co2O5.5: phase stability and structural properties