Mechanisms of the formation of a surface phase with the matrix composition in a Ca2Nb2O7 single crystal


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We have studied the local composition and nanoscale surface morphology of a calcium niobate, Сa2Nb2O7, single crystal after thermally stimulated heterosegregation with the aim of identifying the mechanisms underlying the formation of a surface phase with the matrix composition. The identity of the compositions of the surface phase and matrix is accounted for in terms of a liquid-phase model for surface segregation, which includes diffusion, melting, and crystallization processes.

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Yu. Tomashpolsky

Karpov Institute of Physical Chemistry (Russian State Scientific Center)

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Email: tomash@nifhi.ru
俄罗斯联邦, per. Obukha 3-1/12, str. 6, Moscow, 105064

V. Matyuk

Karpov Institute of Physical Chemistry (Russian State Scientific Center)

Email: tomash@nifhi.ru
俄罗斯联邦, per. Obukha 3-1/12, str. 6, Moscow, 105064

N. Sadovskaya

Karpov Institute of Physical Chemistry (Russian State Scientific Center)

Email: tomash@nifhi.ru
俄罗斯联邦, per. Obukha 3-1/12, str. 6, Moscow, 105064

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