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Alexandrite

Tsarstone collectors guide


Thermochroism

Thermochroism
The science of high temperature of one subject to change its color, because by increasing of temperature expands the bond length of lattice, reduced the ligand field. A red compound of 10% Cr2O3 and 90% Al2O3 by increasing the temperature to over 400 C the color turn to gray and a little about 400 C to green. Thermochroism seen both in both reversible and irreversible. Thermochroism seen in organic compositions combined with color change when the ligand field is in transfer with metal ion and when temperature change. the color change is reversible in solution such as yellow anil dye to red anil dye by heat, but in the solid, the change may remain permanent on cooling.
Bibliographic details
Page title Definition of Thermochroism
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 04:46 UTC
Date accessed 06 April 2026 15:44 UTC
Permanent link http://w.alexandrite.com/viewpage.html?id=GG-105-00001
AMA style
David Weinberg. "Definition of Thermochroism". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 04:46 UTC. Available at: http://w.alexandrite.com/viewpage.html?id=GG-105-00001. Accessed April 06, 2026.
APA style
"Definition of Thermochroism". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 15:44, April 06, 2026, from http://w.alexandrite.com/viewpage.html?id=GG-105-00001.
Bluebook style
"Definition of Thermochroism", http://w.alexandrite.com/viewpage.html?id=GG-105-00001 (last visited April 06, 2026).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Definition of Thermochroism", http://w.alexandrite.com/viewpage.html?id=GG-105-00001 (The science of high temperature of one subject to change its color, because by increasing of temperature expands the bond length of lattice, reduced the ligand field. A red compound of 10% Cr2O3 and 90% Al2O3 by increasing the temperature to over 400 C the color turn to gray and a little about 400 C to green. Thermochroism seen both in both reversible and irreversible. Thermochroism seen in organic compositions combined with color change when the ligand field is in transfer with metal ion and when temperature change. the color change is reversible in solution such as yellow anil dye to red anil dye by heat, but in the solid, the change may remain permanent on cooling. ) (as of Apr. 06, 2026, 15:44 GMT).
CBE/CSE style
David Weinberg. "Definition of Thermochroism". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 04:46 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 04:46 UTC [cited 2026 Apr 06]. Available from: http://w.alexandrite.com/viewpage.html?id=GG-105-00001.
Chicago style
David Weinberg, "Definition of Thermochroism", http://w.alexandrite.com/viewpage.html?id=GG-105-00001, (accessed April 06, 2026).
MLA style
"Definition of Thermochroism". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 04:46 UTC. 06 Apr 2026 http://w.alexandrite.com/viewpage.html?id=GG-105-00001
MHRA style
David Weinberg, "Definition of Thermochroism", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 04:46 UTC, http://w.alexandrite.com/viewpage.html?id=GG-105-00001 [accessed 06 April 2026].
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