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It turns out Z CAN be a non-integer number. Not every day a question you ask leads to an official change to an IUCr definition
Carolyn P. Brock: Can Z, the number of formula units per unit cell, be a fraction? A report of the IUCr Commission on Crystallographic Nomenclature ##CommissionReport##Z##NumberOfFormulaUnitsInTheUnitCell... ##IUCrhttps://journals.iucr.org/paper?S2053273325007053
Can Z, the number of formula units per unit cell, be a fraction? A report of the IUCr Commission on Crystallographic Nomenclature
The Commission on Crystallographic Nomenclature has concluded that, in some rare, carefully justified circumstances, Z, the number of formula units in the unit cell, may be a fraction.
journals.iucr.org
August 18, 2025 at 5:51 PM
It turns out Z CAN be a non-integer number. Not every day a question you ask leads to an official change to an IUCr definition