Erratum of the paper “Cr-substitution in Ba2In2O5(H2O)x (x = 0.16, 0.74)”

1. Errors were found in Fig. 4 FT-IR spectra, and the interpretation for the respective Figure was corrected.2. The proposed chemical formula of Ba2In2O5·(H2O)x and Ba2(In1.8Cr0.2)O5·(H2O)y from determined water contents were updated.3. Errors were spotted in the reference list and corrected. It has been realized that the FT-IR spectra of Ba2In2O5·(H2O)x and Ba2(In1.8Cr0.2)O5·(H2O)y shown in Fig. 4 of the originally published paper had been assigned incorrectly. [1] Hence, given observation and data interpretation has not been correct either. The correction is given as following. FT-IR spectra of Ba2In2O5·(H2O)x and Ba2(In1.8Cr0.2)O5·(H2O)y are shown in corrected Fig. 4. The peaks at 871 and 2981 cm−1 are assigned to the vibrations of InO4 tetrahedra units and OH− stretching, respectively [19,20]. The peak at 1416 cm−1 is interpreted as the CO vibration of carbonate [32]. The peaks at 871 and 2981 cm−1 are significantly smaller for Ba2In2O5·(H2O)x. Additionally, characteristic small peaks of Ba2(In1.8Cr0.2)O5·(H2O)y in the wavenumber range of 1250 to 1050 cm−1 (small arrows in corrected Fig. 4) appear by Cr substitution. The original paragraph previously published was following. [1]. FT-IR spectra of Ba2In2O5·(H2O)x and Ba2(In1.8Cr0.2)O5·(H2O)y are shown in Fig. 4. The peaks at 871 and 2981 cm−1 are assigned to the vibrations of InO4 tetrahedra units and OH- stretching, respectively [19,20]. The peak at 1416 cm−1 is interpreted as the CO vibration of carbonate [32]. It can be seen that for Ba2(In1.8Cr0.2)O5·(H2O)y the peaks at 871 and 2980 cm−1 are significantly smaller, whereas the peak at around 1416 cm−1 is more pronounced compared to the pristine Ba2In2O5·(H2O)x. Additionally, characteristic small peaks of Ba2In2O5·(H2O)x in the wavenumber range of 1250 to 1050 cm−1 (small arrows in Fig. 6), completely vanished by Cr substitution. Corrected Fig. 4. Songhak Yoon et al. [Figure presented] Corrected Fig. 4. FT-IR spectra of (1) Ba2In2O5·(H2O)x and (2) Ba2(In1.8Cr0.2)O5·(H2O)y. Originally published Fig. 4. Songhak Yoon et al. [Figure presented] Fig. 4. FT-IR spectra of (1) Ba2In2O5·(H2O)x and (2) Ba2(In1.8Cr0.2)O5·(H2O)y. During the preparation of our recently published paper [2], we realized that the accurate estimation of the amount of water in Ba2In2O5·(H2O)x and Ba2(In1.8Cr0.2)O5·(H2O)y is not achievable from the mass change in thermogravimetric analysis. Combined analysis of magic angle spinning nuclear magnetic resonance (MAS-NMR) and powder neutron diffraction revealed that more than two different types of protons from hydroxyl groups and crystal water were found to be present. Therefore, our model chemical formula Ba2In2O5·(H2O)x and Ba2(In1.8Cr0.2)O5·(H2O)y [1] was too simple to be true. To be more accurate, the chemical formula should be Ba2In2O5-x·(OH)y·(H2O)z and the same should be applied to Cr-substituted sample. As discussed [2], accurate and precious estimation of lattice oxygen, hydroxyl ion, and crystal water may not be trivial. Nevertheless, estimated proton species are reported and sum formula would be Ba2In1.8Cr0.2O5.32(4)–x(OH)x(H2O)y for Cr-substituted sample[2]. [1] S. Yoon, K. Son, H. Hagemann, M. Widenmeyer, A. Weidenkaff, Cr-substitution in Ba2In2O5⋅(H2O)x (x = 0.16, 0.74), Solid State Sci. 73 (2017) 1–6, https://doi.org/10.1016/j.solidstatesciences.2017.08.019.[2] R. Finger, M. Widenmeyer, T. C. Hansen, D. Wallacher, S. Savvin, M. Bertmer, A. Weidenkaff, H. Kohlmann, Effects of Cr doping and water content on the crystal structure transitions of Ba2In2O5 Crystals 11 (2021) 1548, https://doi.org/10.3390/cryst11121548. Three errors and inaccuracies in the reference lists were found from the originally published paper. Those need to be corrected and listed in the following. Previous) [8] J. Bielecki, S.F. Parker, L. Mazzei, L. Börjesson, M. Karlsson, J. Mater. Chem. A. 4 (2016).Corrected) [8] J. Bielecki, S.F. Parker, L. Mazzei, L. Börjesson, M. Karlsson, J. Mater. Chem. A. 4 (2016) 1224–1232Previous) [10] A. Jarry, O. Joubert, E. Suard, J.-M. Zanotti, E. Quarez, Phys. Chem. Chem. Phys. (2016) 25–30.Corrected) [10] A. Jarry, O. Joubert, E. Suard, J.-M. Zanotti, E. Quarez, Phys. Chem. Chem. Phys. 18 (2016) 15751–15759.Previous) [29] A. Rolle, P. Ruoussel, A. Rubbens, R.N. Vannier, Solid State Ionics. (2007) 1–14.Corrected) [29] N. Tarasova, I. Animitsa, T. Denisova, R. Nevmyvako, Solid State Ionics 275 (2015) 47–52.