NMR detection of dynamical processes in antiferroelectric nanoclusters during the order-disorder transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>NH</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">H</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>AsO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>

W2084696047 · 수집 2026-10-04 18:12:19

T11878 Solid-state spectroscopy and crystallography

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We study the dynamics of inorganic antiferroelectric nanoclusters formed during an order-disorder transition and demonstrate the coexistence of the two phases in a region of 2--3 K around the transition temperature ${T}_{N}\ensuremath{\sim}215$ K. Single crystals of ${\mathrm{NH}}_{4}{\mathrm{H}}_{2}{\mathrm{AsO}}_{4}$, a model hydrogen-bonded compound, show an antiferroelectric-paraelectric transition studied by means of highly sensitive magic angle spinning ${}^{15}\mathrm{N}$ NMR at 21.1 T. The phase coexistence is demonstrated by a double-peak structure of the chemical shift. Two-dimensional chemical exchange spectroscopy and spin-lattice relaxation time $({T}_{1})$ measurements show that the clusters are dynamic with sizes $\ensuremath{\sim}50$ nm and lifetimes approaching seconds as $T\ensuremath{\rightarrow}{T}_{N}$. Their occupancy increases rapidly to fill the crystal volume below ${T}_{N}$. This study provides evidence for the commonality of the phase transitions in systems with electric properties and provides an improved spectroscopic method for such studies.

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