FeCl$_{3}$ | FeBr$_{3}$ | FeI$_{3}$ | Fe$_{2}$Br$_{3}$I$_{3}$ | Fe$_{2}$Cl$_{3}$I$_{3}$ | Fe$_{2}$Cl$_{3}$Br$_{3}$ | |
---|---|---|---|---|---|---|

$a$ | 94.1 | 85.2 | 82 | 88 | 105 | 96.6 |

$b$ | $-28.9$ | $-14.2$ | $-5.8$ | $-7.9$ | $-16.5$ | $-36.8$ |

$\lambda$ | 17.5 | 17.2 | 10.3 | 14 | 17.3 | 17.3 |

$\varDelta$ | 70 | 68 | 41 | 56 | 69 | 69 |

$\epsilon$ | 16 | 20 | 27 | 34 | 24 | 17 |

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