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Structure deformations induced by pressure and temperature in synthetic “Cs-tetra-ferri-annite” 1M [Cs 1.78 (Fe 2+  5.93 Fe 3+  0.07 )(Si 6.15  Fe 3+  1.80 Al 0.05 )O 20 (OH) 4 ], space group C2/m, were an­alyzed to investigate the capability of the mica structure to store the radiogenic isotopes  135 Cs and  137 Cs. “Cs-tetra-feni-annite” is not a mineral name, but for the sake of brevity is used here to designate a synthetic analog of the mineral tetra-ferri-annite. The bulk modulus and its pressure derivative determined by fitting the unit-cell volumes between 0 and 47 kbar to a third-order Birch-Mumaghan equation of state are K 0  = 257(8) kbar and K 0 ′ = 21(1). respectively. Between 23 °C and 582 °C. the a and b lattice parameters remain essentially unchanged, but the thermal expansion coefficient of the c axis is a c  = 3.12(9) x 10 -5 ° C -1 . High pressure (P) and high temperature (T) produce limited internal strain in the structure. The tetrahedral rotation angle, α , is very small and does not change significantly throughout the P and T range investigated. Above 450 °C in air. “Cs-tetra- ferri-annite" underwent an oxidation of octahedral iron in the M2cis site, balanced by the loss of H and shown by a decrease of the unit-cell volume.

‘‘Cs-tetra-ferri-annite:’’ High-pressure and high-temperature behavior of a potential nuclear waste disposal phase