Examples of artificially grown crystals
lanthanum praseodymium aluminate
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| Grown by OFZ in reducing conditions. The Brown region is indicative of Pr4+, where the desired green region is indicative of Pr3+. The quick transition from brown to green at the necked region occurred as a result of a bubble popping in the zone during growth. |
Crystal details |
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| Compound name | lanthanum praseodymium aluminate |
| Formula | La0.8Pr0.2AlO3 |
| Dimensions | 4x4x60mm |
| Mass | 4.6g |
| Colour | transparent, green, brown |
| Keywords | inorg; oxide; bulk |
Growth conditions |
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| Technique | Optical Floating Zone |
| Temperature | 2300 K |
| Pressure | |
| Growth rate | |
| Solvent | |
| Doping procedure | |
| Keywords | melt; sol; solid |
Comments |
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| Application(s) | This perovskite exhibits various structural phase transitions as well as Jahn-teller distortions. The temperature of the transitions is dependent on x in La(1-x)Pr(x)AlO3. The structure is found to go from (from high to low in temperature) Pm3m to R3c to C2/m. Study of these phase transitions is still being conducted. Recently, heat capacity measurements were taken for the transition R3c to C2/m where no latent heat was found. Further studies are planned with these large single crystals to understand the complex structural change. |
| Link(s) | http://pubs.acs.org/doi/abs/10.1021/cg101273y; http://journals.aps.org/prb/abstract/10.1103/PhysRevB.89.174106 |
| Other remarks | |
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