Density of vibrational states in hydrogen bonded crystals

Potassium dihydrogen phosphate

C. Andreani Istituto di Struttura della Materia del CNR, Via E. Fermi 38, 00036, Frascati, Roma, Italy; Dipartimento di Fisica, Università di Roma ‘Tor Vergata’, Roma, Italy

P. Bisanti Istituto di Struttura della Materia del CNR, Via E. Fermi 38, 00036, Frascati, Roma, Italy; Dipartimento di Fisica, Università di Roma ‘La Sapienza’, Roma, Italy

C. Petrillo Istituto di Struttura della Materia del CNR, Via E. Fermi 38, 00036, Frascati, Roma, Italy

F. Sacchetti Istituto di Struttura della Materia del CNR, Via E. Fermi 38, 00036, Frascati, Roma, Italy; Dipartimento di Fisica, Università di Perugia, Perugia, Italy

B.C. Boland Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, Oxon, England

Z.A. Bowden Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, Oxon, England

A.D. Taylor Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, Oxon, England

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Abstract

The vibrational density of states in potassium dihydrogen phosphate is studied by means of neutron scattering in the energy range 40 to 400 meV above and below the order disorder transition temperature. The present measurement shows that rather long-range forces are probably present, while some fluctuation of the force constants affects the vibrational spectrum in the disordered phase.

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Density of vibrational states in hydrogen bonded crystals

Potassium dihydrogen phosphate

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Density of vibrational states in hydrogen bonded crystals

Potassium dihydrogen phosphate

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