To this end deuterated versions of BaTiO 3 x H y were synthesized. Two samples were prepared by reducing barium titanium oxide with deuterated NaBD 4 and CaD 2 , while the third was obtained by reducing with CaH 2 followed by hydride exchange with gaseous deuterium D 2 . We denote each of the samples as BTOD NAB , BTOD CA and BTOD EXCH , respectively. The 2 H NMR We continued by evaluating the amount of deuterium in each sample using the 2 H spectra in Fig. . The quantification was performed by relating the 2 H peak areas between BaTiO 3 x D y and a substance (glycine) with known deuterium content. The quantification results reveal that BTOD NAB has a lower hydride concentration than samples reduced with CaH 2 , which is in agreement with previous studies. The hydride shifts are tabulated in Table , along with the determined hydride content y. We notice that the shift becomes more negative with increasing hydride concentration, which is the first indication that the examined materials are in a bandstate. We discuss this topic in detail in the section 3.2.