The existence of a novel double-molybdate
phase with a palmierite-type structure, Cs
2
Ba(MoO
4
)
2
, is revealed in this work, and its structural properties
at room temperature have been characterized in detail using X-ray
and neutron diffraction measurements. In addition, its thermal stability
and thermal expansion are investigated in the temperature range 298–673
K using high-temperature X-ray diffraction, leading to the volumetric
thermal expansion coefficient α
V
≈ 43.0 × 10
–6
K
–1
. The compound’s standard enthalpy of formation at 298.15
K has been obtained using solution calorimetry, which yielded Δ
f
H
m
°(Cs
2
Ba(MoO
4
)
2
, cr, 298.15 K) = −3066.6 ± 3.1 kJ·
mol
–1
, and its standard entropy at 298.15 K has
been derived from low-temperature (2.1–294.3 K) thermal-relaxation
calorimetry as
S
m
°(Cs
2
Ba(MoO
4
)
2
, cr, 298.15 K) = 381.2 ± 11.8
J K
–1
mol
–1
.
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