Comments on structural and electrical analysis of polycrystalline ceramic PbCaBiNbO₆ by AK Panda et al. [J. Mater. Sci.: Mater. Elektron. 34, 1640 (2023)]

My comments concern the errors in the crystallographic part of a recent paper published in this journal entitled "Structural and electrical analysis of polycrystalline ceramic PbCaBiNbO6" by A.K. Panda et al., J. Mater. Sci.: Mater. Elektron. 34, 1640 (2023). The true chemical composition of the studied sample is very different from PbCaBiNbO6 as proposed by authors in their paper. A comparison with three similar compounds was presented indicating that the samples are mixtures of (at least) two crystals Therefore, the subsequent data on other measurements are not on the sample composition the authors have identified and have limited value.