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BELL, Anthony and HENDERSON, CMB (2019). Tetragonal-cubic phase transition in KGaSi2O6 synthetic leucite analogue and its probable mechanism. Journal of Solid State Chemistry, 284, p. 121142.
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Abstract
Synthetic leucite KGaSi2O6 at 298K is I41/a tetragonal and is isostructural with natural leucite (KAlSi2O6); with unit cell parameters of a = 13.1099 (4), c = 13.8100 (4) Å, V = 2373.50 (12) Å3. With increasing temperature it undergoes a reversible, displacive phase transition from I41/a to cubic Ia3‾d; this well-studied phase transition in KAlSi2O6 occurs at ~930K. However for KGaSi2O6 it is smeared out from 673 to ~970K where it consists of a mixture of the low- and high-temperature polymorphs. The proportion of the cubic phase increases with temperature; the cubic phase volume is ~1% larger than the coexisting tetragonal polymorph. At a fixed temperature within this ‘region of coexistence’ phase proportions do not change. Such features are characteristic of 1st order, diffusionless, strain-meditated, martensitic-type phase transitions. It seems that the phase transition for synthetic KGaSi2O6 is close to being purely ferroelastic in character.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Inorganic & Nuclear Chemistry; 0302 Inorganic Chemistry; 0303 Macromolecular and Materials Chemistry; 0306 Physical Chemistry (incl. Structural) |
| Identification Number: | https://doi.org/10.1016/j.jssc.2019.121142 |
| Page Range: | p. 121142 |
| SWORD Depositor: | Symplectic Elements |
| Depositing User: | Symplectic Elements |
| Date Deposited: | 29 Jan 2020 12:28 |
| Last Modified: | 17 Mar 2021 17:45 |
| URI: | https://shura.shu.ac.uk/id/eprint/25738 |
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