A Comparison of the Kinetics for the Thermal Decomposition of Ba(OH)2·H2O Obtained by TG and EGA Techniques

  • P. K. Gallagher
  • E. M. Gyorgy


Simultaneous measurements were made of the weight loss of the sample and the dew point of the N2 stream as Ba(OH) H2O was heated at 1°C/ min. A computer program converted the dew point to weight of water/min and integrated this over the time of the experiment. The amount of water due to the decomposition was small compared to the natural content of the predried gas stream. Consequently, accurate subtraction of this background was required and achieved by using a B spline polynomial fit to the EGA data in the regions where no weight loss occurred.

The corrected EGA curve compared very well with the TG results. Kinetic analysis of the simple loss of the water of hydration (60–100°C) was performed. Agreement was excellent for the simple dehydration.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. (1).
    G. S. Krinchik, R. M. Shavartsman, and A. Y. Kipnis, JETP Lett., 19, (1974) 231Google Scholar
  2. (2).
    M. W. Rowe, S. M. Lake, and R. Fanick, Nature (London), 266 (1977) 612CrossRefGoogle Scholar
  3. (3).
    R. S. Mehta, M. S. Dresselhaus, G. Dresselhaus, and H. J. Zeiger, Phys. Rev. Lett. 43 (1979) 970CrossRefGoogle Scholar
  4. (4).
    P. K. Gallagher, E. M. Gyorgy, and H. E. Bair, J. Chem. Phys. 71 (1979) 830CrossRefGoogle Scholar
  5. (5).
    B. C. Scales and M. B. Maple, Phys. Rev. Lett. 39 (1977) 1636CrossRefGoogle Scholar
  6. (6).
    J. C. Measor and K. K. Afzulpurkar, Philos. Mag., 10 (1964) 817CrossRefGoogle Scholar
  7. (7).
    P. K. Gallagher and D. W. Johnson Jr., Thermochim. Acta 4 (1972) 283CrossRefGoogle Scholar
  8. (8).
    D. W. Johnson, Jr., and P. K. Gallagher, J. Phys. Chem. 76 (1972) 1474CrossRefGoogle Scholar
  9. (9).
    J. M. Criado and J. Morales, J. Therm. Anal. 10 (1976) 103CrossRefGoogle Scholar
  10. (10).
    M. D. Judd and M. I. Pope, “Thermal Analysis, Vol. 2” (R. F. Schwenker, Jr. and P. D. Garn, eds.), Academic Press, N. Y. 1969, p. 1423Google Scholar

Copyright information

© Springer Basel AG 1980

Authors and Affiliations

  • P. K. Gallagher
    • 1
  • E. M. Gyorgy
    • 1
  1. 1.Bell LaboratoriesMurray HillUSA

Personalised recommendations