The crystal structures of NiO.3BaO, NiO.BaO, BaNiO₃and intermediate phases with composition near Ba₂Ni₂O₅; with a note on NiO

High Pressure Synthesis of SrFe₁₋<i>_x</i>Ni<i>_x</i>O₃

“…In addition to unusual oxidation states of 2+ and 3+ for Fe typically seen in FeO and Fe 2 O 3 , respectively, an unusual high state like 4+ can be stabilized in oxides [1][2][3][4][5][6] . The simple cubic perovskite SrFeO 3 (see the crystal structure in Fig.…”

Ab-initio Band Structure Calculations and 61 Ni-Mössbauer Studies of BaNiO2 , BaNiO3 and CaNiN

“…1) is an isotype of the YCoC type structure [19] and also isotype to SrLiN [20]. The crystal structure is tetragonal (Space group P4 2 /mmc, a = 358.09 (2) In the crystal structure of BaNi0 2 [21][22][23] (Fig. 2) nickel is in a square-planar coordination by oxygen.…”

“…The calculated principal axes system is shown in Figure 2. Using our theory we calculate a large negative q value of -15.59-10 21 Vm -2 , and r] is equal to 0.33. These B. Hannebauer et al 5 a 0 ).…”

“…However, the multiplet spectrum might show sufficient structure to determine the value and the sign of the largest component of the EFG, q. Values on the order of q ~ 4 • 10 21 Vm -2 may be detected if "line broadening" by magnetic interaction can be excluded for the relevant component. Broadening by isomer shift can be excluded because of the small value of the difference of the nuclear charge radius.…”

High-Pressure Synthesis and Structures of New Barium Chromium Sulfides, BaCr4S7 and Ba2Cr5S10, with New Type Face-Sharing CrS6 Structure Units

“…17 We have prepared two chromium sulfides with 1-D structures, Ba 3 CrS 5 , and Ba 3 Cr 2 S 6 at high pressures and high temperatures. 1 These sulfides, having structures that are closely related to BaNiO 3 , [18][19][20] structure and can be prepared only by high-pressure synthesis method. Reaction conditions of the high-pressure synthesis method are completely different from any other conventional ones using evacuated ampoules or floating CS 2 or H 2 S gases.…”