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We investigate Cartan subalgebras in nontracial amalgamated free product von Neumann algebras 
${\mathop{M{}_{1} \ast }\nolimits}_{B} {M}_{2} $
over an amenable von Neumann subalgebra 
$B$
. First, we settle the problem of the absence of Cartan subalgebra in arbitrary free product von Neumann algebras. Namely, we show that any nonamenable free product von Neumann algebra 
$({M}_{1} , {\varphi }_{1} )\ast ({M}_{2} , {\varphi }_{2} )$
with respect to faithful normal states has no Cartan subalgebra. This generalizes the tracial case that was established by A. Ioana [Cartan subalgebras of amalgamated free product 
${\mathrm{II} }_{1} $
factors, arXiv:1207.0054]. Next, we prove that any countable nonsingular ergodic equivalence relation 
$ \mathcal{R} $
defined on a standard measure space and which splits as the free product 
$ \mathcal{R} = { \mathcal{R} }_{1} \ast { \mathcal{R} }_{2} $
of recurrent subequivalence relations gives rise to a nonamenable factor 
$\mathrm{L} ( \mathcal{R} )$
with a unique Cartan subalgebra, up to unitary conjugacy. Finally, we prove unique Cartan decomposition for a class of group measure space factors 
${\mathrm{L} }^{\infty } (X)\rtimes \Gamma $
arising from nonsingular free ergodic actions 
$\Gamma \curvearrowright (X, \mu )$
on standard measure spaces of amalgamated groups 
$\Gamma = {\mathop{\Gamma {}_{1} \ast }\nolimits}_{\Sigma } {\Gamma }_{2} $
over a finite subgroup 
$\Sigma $
.
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