Synthesis and Crystal Structures of InGaO₃(ZnO)_m (m = 2 and 3)  

Abstract

, respectively, was confirmed by valence sum calculations. The structure of InGaO 3 (ZnO) 3 was refined from powder X-ray diffraction data. InGaO 3 (ZnO) 3 crystallises trigonal (R 3;¯m; No. 166; a = 3.2871(9) Å; c = 41.589(1) Å, R Bragg = 0.0506). The space group was confirmed by CBED. The structure of InGaO 3 (ZnO) 3 is similar to InGaO 3 (ZnO) 2 , however, the wurtzite type part of the structure has an even number of closed packed oxygen layers and thus the inversion boundary within this area is different. The compounds described here have the structural charactistics as other known members with general formula (ARO 3 )·(ZnO) m ) with m = integer.

SPS‐assisted synthesis of InGaO3(ZnO)m ceramics, and influence of m on the band gap and the thermal conductivity

“…Therefore, it seems from these observations that we have not been successful in the synthesis of the homologous compound m = 8. This result is consistent with previous studies that showed that samples with even values of m are more difficult to synthesize that samples with odd values of m, and with the fact that the successful synthesis of InGaO 3 (ZnO) 8 has never been reported in the literature. Contrary to this situation, no inhomogeneity of the concentration of In has been observed for m = 6 and 7 (representative examples of In elemental mappings at various scales are shown in Figure S15).…”

“…[1][2][3][4] In this structure, octahedral-coordinated In atoms form an [InO 2 ] − layer, whereas Zn and Ga atoms occupy distorted tetrahedra and bipyramids and form a [GaZn m O m+1 ] + layer, with a distribution of Zn and Ga that is still under debate and may depend on the value of m (see for example Ref. [5][6][7][8]). To date, outside their crystallographic properties, they have been mostly studied in the thin film form.…”

The Crystal Structure of InGaO3(ZnO)4: A Single Crystal X‐ray and Electron Diffraction Study

“…The result shows that InGaO 3 (ZnO) 4 is a member of the structure family with general formula ARO 3 (ZnO) m . The compound has the same type of structure like InGaO 3 (ZnO) 2 , which was solved earlier 10. The structure may be regarded in terms of closed‐packed oxygen ions.…”

“…The displacement parameters of O4, the oxygen ion in the equatorial plane of the GaO 5 unit, are elongated along c . A comparison between the components with m = 2 10 and m = 4 shows an increasing displacement parameter of O4, which may indicate a split position. Attemps to refine a split position for this oxygen atom showed no reasonable results.…”

“…Furthermore, it is difficult to synthesise pure compounds 9. Recently, single crystals were prepared of InGaO 3 (ZnO) 2 solely 10. In many studies it is reported that mixtures of phases with variation m = ±1 were obtained 8.…”