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Raman spectroscopy and heat capacity measurement of calcium ferrite type MgAl2O4 and CaAl2O4

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Abstract

Raman spectroscopy of calcium ferrite type MgAl2O4 and CaAl2O4 and heat capacity measurement of CaAl2O4 calcium ferrite were performed. The heat-capacity of CaAl2O4 calcium ferrite measured by a differential scanning calorimeter (DSC) was represented as C P(T)=190.6–1.116 × 107 T −2 + 1.491 × 109 T −3 above 250 K (T in K). The obtained Raman spectra were applied to lattice dynamics calculation of heat capacity using the Kieffer model. The calculated heat capacity for CaAl2O4 calcium ferrite showed good agreement with that by the DSC measurement. A Kieffer model calculation for MgAl2O4 calcium ferrite similar to that for CaAl2O4 calcium ferrite was made to estimate the heat capacity of the former. The heat capacity of MgAl2O4 calcium ferrite was represented as C P(T)=223.4–1352T −0.5 − 4.181 × 106 T −2 + 4.300 × 108 T −3 above 250 K. The calculation also gave approximated vibrational entropies at 298 K of calcium ferrite type MgAl2O4 and CaAl2O4 as 97.6 and 114.9 J mol−1 K−1, respectively.

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Acknowledgments.

We thank anonymous reviewers for helpful suggestions and Professor M. Matsui for helping WMIN calculation. This study was supported in part by grants-in-aid from the Ministry of Education, Science and Culture, Japan, and the Japan Society for the Promotion of Science.

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Author notes

  1. A. Kubo

    Present address: Institue for Study of the Earth's Interior, Okayama University, 827 Yamada, Misasa, Tottori, 682-0193, Japan

  2. K. Aoki

    Present address: Synchrotron Radiation Research Center, Kansai Research Establishment, Japan Atomic Energy Research Institute, Kouto 1-1-1, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan

Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, Gakushuin University, 1-5-1 Mejiro, Toshima-ku, Tokyo, 171-8588, Japan

    H. Kojitani, K. Nishimura, A. Kubo, M. Sakashita & M. Akaogi

  2. National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan

    K. Aoki

Authors
  1. H. Kojitani
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  2. K. Nishimura
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  3. A. Kubo
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  4. M. Sakashita
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  5. K. Aoki
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  6. M. Akaogi
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Correspondence to H. Kojitani.

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Kojitani, H., Nishimura, K., Kubo, A. et al. Raman spectroscopy and heat capacity measurement of calcium ferrite type MgAl2O4 and CaAl2O4 . Phys Chem Minerals 30, 409–415 (2003). https://doi.org/10.1007/s00269-003-0332-4

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  • DOI: https://doi.org/10.1007/s00269-003-0332-4

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