Cost effective alkaline earth and transition metal complex oxides (Sr_xNi_yO_z) have been synthesized and electrically tested as chromium getter to mitigate Cr poisoning in solid oxide fuel cell (SOFC) power generation systems. In this study, we report the chemical and structural stability of the Sr_xNi_yO_z powder under simulated synthesis and operational conditions. High temperature in-situ X-ray diffraction (XRD) has been used to determine the phase stability of Sr_xNi_yO_z in the temperature range of 850 °C to 1000 °C while SEM-EDS technique was used to study the surface morphology and elemental distribution in bulk phases. XRD results indicate that the synthesized Sr_xNi_yO_z remains stable at 850 °C and 900 °C with no/negligible phase separation of SrO and NiO compounds, whereas exposure to temperatures 950 °C and 1000 °C leads to the decomposition of parent phase and formation of SrO and NiO. Further, it was observed that the powder samples sintered at 950 °C and 1000 °C showed volume expansion and pulverization when exposed to the humid air atmosphere for 24h. Samples sintered at 850°C and 900°C maintained structural stability and shape.