Reorientational transition in NH₄MnCl₃

C. Pique Instituto de Ciencia de Materiales de Aragón. Universidad de Zaragoza-C.S.I.C., 50009, Zaragoza, Spain

E. Palacios Instituto de Ciencia de Materiales de Aragón. Universidad de Zaragoza-C.S.I.C., 50009, Zaragoza, Spain

R. Burriel Instituto de Ciencia de Materiales de Aragón. Universidad de Zaragoza-C.S.I.C., 50009, Zaragoza, Spain

J. Rubin Instituto de Ciencia de Materiales de Aragón. Universidad de Zaragoza-C.S.I.C., 50009, Zaragoza, Spain

D. Gonzalez Instituto de Ciencia de Materiales de Aragón. Universidad de Zaragoza-C.S.I.C., 50009, Zaragoza, Spain

R. Navarro Instituto de Ciencia de Materiales de Aragón. Universidad de Zaragoza-C.S.I.C., 50009, Zaragoza, Spain

J. Bartolome Instituto de Ciencia de Materiales de Aragón. Universidad de Zaragoza-C.S.I.C., 50009, Zaragoza, Spain

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Abstract

New heat capacity measurements are presented. Results show that the NH₄ ⁺ behaves as a strongly hindered top, in agreement with data of quasielastic neutron scattering. The librational contribution of NH₄ ⁺ to the heat capacity is analyzed in connection with the crystal symmetry and the structural phase transition at 268.6 K.

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Reorientational transition in NH₄MnCl₃

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Reorientational transition in NH4MnCl3

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Reorientational transition in NH₄MnCl₃