Second-order transition

{
  "id": "MLC-T-CHM-010641",
  "term": "Second-order transition",
  "field": "Chemistry",
  "definition": "A phase transition where the first derivatives of the Gibbs free energy with respect to temperature and pressure (entropy and volume) are continuous, but the second derivatives (heat capacity, compressibility, thermal expansion coefficient) are discontinuous. There is no latent heat associated with this type of transition. Examples include the ferromagnetic-paramagnetic transition and some order-disorder transitions.",
  "synonyms": [
    "continuous transition"
  ],
  "subject": "Inorganic Chemistry",
  "see_also": [
    "heat capacity",
    "order-disorder transition"
  ],
  "references": [
    "PAC, 1994, 66, 577. 'Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)' on page 589 (https://doi.org/10.1351/pac199466030577)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/second-order-transition/"
}