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Heat capacity and thermodynamic properties of lanthanum(III) chromate(III): LaCrO3, at temperatures from 298.15 K. Evaluation of the thermal conductivity

✍ Scribed by Natsuko Sakai; Svein Stølen

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
449 KB
Volume
27
Category
Article
ISSN
0021-9614

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✦ Synopsis

The heat capacity of lanthanum(III) chromate(III): LaCrO3, was measured over the temperature range from T=272 K to T=1000 K by adiabatic shield calorimetry. Thermodynamic functions have been derived and the values of Cp, m , D T 298.15 K H°m, and D T 298.15 K S°m at T=1000 K are 15.816•R, 10402•R •K, and 17.636•R, respectively. Well known phase transitions are observed at T=287 K and at T=536 K. The first heat-capacity effect is due to a magnetic order-disorder transition from an antiferromagnetic to a paramagnetic state, whereas the second is due to a structural transition from an orthorhombic to a rhombohedral structure. An anomaly previously unreported was observed as a heat-capacity effect at T1855 K. The origin of this effect, the presence of which is shown to depend on thermal history, is discussed. The thermal conductivity of LaCrO3 at T=1273 K; l=1.9 W•K -1 •m -1 , was calculated from the present heat-capacity results and thermal-diffusivities from the literature.

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