Trasitions between temperatures below and above the Curie point.

[Reginaldo Gonçalves Leão Junior]

Hello everyone.
I'm creating a yaml file to study oxidation and reduction of iron oxides in two connected reactors.
However, the temperature in each reactor is quite different. In the first, the oxides are above the Curie point, and in the second, below the Curie point.  Since the coefficients for NASA7 poles are also different at these temperatures, I created two separate species for each case.

  - name: Fe2O3-bcr(S)

    composition: {Fe: 2.0, O: 3.0}

    thermo:

      model: NASA7

      temperature-ranges: [298.15, 600.0, 960.0]

      data:

        - [-2.713211885e+06, 2.323047773e+04, -6.765701770e+01, 1.306052231e-01,

        -6.970688120e-05, 0.0, 0.0]

        - [3.333492510e+08, -1.859961832e+06, 3.885138190e+03, -3.562599480e+00,

        1.231055904e-03, 0.0, 0.0]

    equation-of-state:

      model: constant-volume

      molar-volume: 30.42 cm^3/mol

    site-density: 7.0e-6 mol/m^2

    note: from PyGlenn (Leao Jr.)

  - name: Fe2O3-acr(S)

    composition: {Fe: 2.0, O: 3.0}

    thermo:

      model: NASA7

      temperature-ranges: [960.0, 1800.0, 6000.0]

      data:

        - [-2.844009066e+07, 1.253786450e+05, -2.119080355e+02, 2.221481558e-01,

        -1.206765164e-04, 3.480738050e-08, -4.165297860e-12]

        - [0.0, 0.0, 1.711439880e+01, 0.0, 0.0, 0.0, 0.0]

    equation-of-state:

      model: constant-volume

      molar-volume: 30.42 cm^3/mol

    note: from PyGlenn (Leao Jr.)

    site-density: 7.0e-6 mol/m^2

But how can I implement the transitions between the different ranges? Using reactions? If so, how can I write a reaction like this?

Thanks in advanve!