Mössbauer spectroscopy study of Y-type Hexaferrite (Ba 2 Co 2 Fe 12 O 22 ) prepared by the co-precipitation method Abdel-Fatah Lehlooh 1 & Reham Alghazo 1 & Fuad Rawwagah 1 & Ayman Hammoudeh 2 & Sami Mahmood 3 # Springer Nature Switzerland AG 2019 Abstract In this work we report the results of structural and Mössbauer spectroscopy studies for Ba 2 Co 2 Fe 12 O 22 samples prepared by coprecipitation following two different synthesis routes: route A (pH = 10, NaOH + Na 2 CO 3 added dropwise), and route B (pH = 14, NaOH + Na 2 CO 3 added one shot). The resulting powders were sintered for 4 h at different temperatures (700 °C to 1100 °C in steps of 100 °C). The sintered powders were characterized by x-ray diffraction (XRD) and room temperature Mössbauer spectroscopy. XRD and Mössbauer results of the sample prepared by route A and sintered at 700 °C revealed formation of spinel phases (CoFe 2 O 4 and/or Fe 3 O 4 ), BaCO 3 and BaM-type phase. The Co 2 Y phase developed in the samples sintered at 800 °C and 900 °C with spinel species as impurities, and single (pure) Co 2 Y phase was obtained at higher temperatures. On contrast, XRD patterns and the Mössbauer spectra for the samples prepared by route B showed different results, where the sample sintered at 700 °C consisted of only spinel phases. The Co 2 Y phase developed at higher temperatures, coexisting with significant amounts of other phases. Keywords Ba 2 Co 2 Fe 12 O 22 . Y-type hexaferrite . X-ray diffraction . Coprecipitation . Mössbauer spectroscopy . Sintering Hyperfine Interactions (2020) 241:21 https://doi.org/10.1007/s10751-019-1676-6 This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME2019), 1-6 September 2019, Dalian, China Edited by Tao Zhang, Junhu Wang and Xiaodong Wang * Abdel-Fatah Lehlooh aflehlooh@yu.edu.jo 1 Department of Physics, Yarmouk University, Irbid, Jordan 2 Department of Chemistry, Yarmouk University, Irbid, Jordan 3 Department of Physics, The University of Jordan, Amman, Jordan