Cr6+-containing phases in the system CaO−Al2O3−CrO42−−H2O at 23 °C

► Solid solutions and properties of 3CaO·Al2O3·CaCrO4·nH2O and C3A·1/2 Ca(OH)2·1/2 CaCrO4·12 H2O are given. ► Different hydrates of Ca-Al-hydroxysalts (LDH) with chromate-anions synthesized and characterized. ► Interlayer exchange reaction of 2OH− and CrO42− investigated. ► Thermal dehydration and change of lattice parameters are given