Oriented transformation of chalcophanite during thermal treatment
Abstract
The transformation of chalcophanite, ZnMn3O7, 3H2O, during thermal treatment has been studied by x-ray, differential thermal analysis and thermogravimetric methods of analyses. It was observed that chalcophanite transformed topotactically into a phase, ZnMn3O7. The orientational relationships between the two phases are as follows: [001]Chal//[001]znMn3O7, [010]chal//[010]znMn3O7. The relative orientation between the [010] and [100] directions in both the phases will remain the same. The ab plane in the original phase will, however, be twisted round the [010] direction during the transformation so that the [001] direction in the transformed phase becomes perpendicular to both [010] and [100] and the crystal becomes hexagonal from triclinic.
The axial parameters of the transformed phase, ZnMn3O7, were found to be a = b = 7.55 Å and c = 14.22 Å. The mechanism of transformation has been explained from structural view point by the removal of H2O layers from the chalcophanite structure with the migration of Zn into the vacant octahedral position in the MnO6 sheets. ZnMn3O7 transformed again at 500°C into a phase (Zn,Mn)Mn2O4, which was structurally similar to hetaerolite or hausmannite, with tetragonal cell dimensions a = b = 5.74 Å and c = 9.32 Å.
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Articles in the same Issue
- Struktur und absolute Konfiguration des Methylsulfonats von Penbutolol
- Röntgeneinkristallstrukturanalyse eines Chlorderivates von Permanentrot FRLL. Vergleich mit dem entsprechenden Derivat von Permanentbraun FG
- Linearer elektrooptischer Tensor des monoklinen Lithiumsulfat-Monohydrats
- The molecular and crystal structure of kavaic acid*
- The crystal structure of aramayoite Ag(Sb,Bi)S2*
- The crystal and molecular structure of [24] metacyclophane I*
- The crystal structure of freieslebenite, PbAgSbS3*
- Structure cristalline du monophosphate KTiPO5
- Oriented transformation of chalcophanite during thermal treatment
- Refinement of the crystal structure of gibbsite, Al(OH)3
- Distribution of stacking faults in relation to the growth of cadmium iodide polytypes
- Crystal structures of three CdI2 polytypes
- Deformation-induced thermoluminescence in NaCl:Sr
- Crystal data for (2-methallyl)triplienylstannane, bromodimethyl-2,4-pentanedionatoplatinum(IV), s-alanatopentaamminecobalt(III) perchlorate monohydrate and (1R, 3R or S, 4R, 6S)-1,3,6,8-tetrabromo-p-methane-2-one
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