BSTRACTWe report the synthesis of eight new members of the

i

-MAX family

of the formula (Mo

2/3

RE

1/3

)

2

GaC

where RE = Gd

Tb

Dy

Ho

Er

Tm

Lu

and Yb

the latter not previously incorporated in a MAX phase. The structure and composition of powder samples were investigated by X-ray diffraction

scanning transmission electron microscopy

and energy dispersive X-ray analysis combined with scanning electron microscopy. All phases showed evidence of an orthorhombic (

Cmcm

) structure

and the phases based on Er and Yb also crystallized in a monoclinic (

C

2/

c

) arrangement. The chemical order of the magnetic elements suggests interesting magnetic characteristics

with a high tuning potential through the range of attainable lanthanide elements.