1
|
Romanelli G, Andreani C, Fazi L, Ishteev A, Konstantinova K, Preziosi E, Senesi R, Di Carlo A. Changes in the hydrogen nuclear kinetic energy across the several phases of methylammonium lead tribromide. J Chem Phys 2022; 157:094501. [DOI: 10.1063/5.0104917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present an experimental investigation of methylammonium lead tribromide single crystals in the orthorhombic, tetragonal, and cubic phases based on inelastic and deep inelastic neutron scattering experiments. We show how the average hydrogen nuclear kinetic energy, mainly affected by zero-point vibrational energies, shows differences larger compared to the changes simply related to temperature effects when moving from one phase to another. In particular, the Gaussian contribution to the average nuclear kinetic energy is larger in the tetragonal phase compared to the cubic and orthorhombic ones. Moreover, we find that the vibrational densities of states of MAPbBr3 single crystals in the orthorhombic phase are compatible with previously reported results on powder samples, and that the only vibrational modes that show slightly different frequencies compared to MAPbI3 are those in the energy range between 100 and 300 cm-1, related to librational/rotational modes. As these shifts are of about 10 cm-1, and do not affect any higher-energy vibrational mode, we conclude that the zero-point energies and average nuclear kinetic energies in the two-hybrid organic/inorganic perovskites are expected to be approximately the same within a harmonic framework.
Collapse
Affiliation(s)
- Giovanni Romanelli
- Università degli Studi di Roma Tor Vergata Dipartimento di Fisica, Italy
| | - Carla Andreani
- Dipartimento di Fisica and Centro NAST, University of Rome Tor Vergata, Italy
| | - Laura Fazi
- Universita degli Studi di Roma Tor Vergata Dipartimento di Scienze e Tecnologie Chimiche, Italy
| | - Arthur Ishteev
- LASE - Laboratory of Advanced Solar Energy, NUST MISiS, 119049, Russia
| | | | - Enrico Preziosi
- Physics Department and NAST Centre, Università degli Studi di Roma Tor Vergata Dipartimento di Fisica, Italy
| | - Roberto Senesi
- Dipartimento di Fisica, Università degli Studi di Roma, Italy
| | - Aldo Di Carlo
- CHOSE - Centre For Hybrid and Organic Solar energy, University of Rome Tor Vergata, Italy
| |
Collapse
|
2
|
Krzystyniak M, Romanelli G, Fernandez-Alonso F. Non-destructive quantitation of hydrogen via mass-resolved neutron spectroscopy. Analyst 2019; 144:3936-3941. [PMID: 31041932 DOI: 10.1039/c8an01729h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
This work introduces the use of mass-selective neutron spectroscopy as an analytical tool for the quantitative and non-destructive detection of hydrogen in bulk media. To this end, systematic measurements have been performed on a series of polyethylene standards of known thickness and density, in order to establish optimal data-acquisition protocols as well as associated limits of detection and quantitation. From this analysis, we conclude that state-of-the-art epithermal-neutron instrumentation enables the detection of aeral molar densities of bulk hydrogen in the μmol cm-2 range. We also discuss potential improvements on the horizon, with a view to broadening the scope of the technique across chemistry, materials science, and engineering.
Collapse
Affiliation(s)
- Maciej Krzystyniak
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK.
| | | | | |
Collapse
|
3
|
Krzystyniak M, Drużbicki K, Romanelli G, Gutmann MJ, Rudić S, Imberti S, Fernandez-Alonso F. Nuclear dynamics and phase polymorphism in solid formic acid. Phys Chem Chem Phys 2017; 19:9064-9074. [PMID: 28304035 DOI: 10.1039/c7cp00997f] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
We apply a unique sequence of structural and dynamical neutron-scattering techniques, augmented with density-functional electronic-structure calculations, to establish the degree of polymorphism in an archetypal hydrogen-bonded system - crystalline formic acid. Using this combination of experimental and theoretical techniques, the hypothesis by Zelsmann on the coexistence of the β1 and β2 phases above 220 K is tested. Contrary to the postulated scenario of proton-transfer-driven phase coexistence, the emerging picture is one of a quantitatively different structural change over this temperature range, whereby the loosening of crystal packing promotes temperature-induced shearing of the hydrogen-bonded chains. The presented work, therefore, solves a fifty-year-old puzzle and provides a suitable framework for the use neutron-Compton-scattering techniques in the exploration of phase polymorphism in condensed matter.
Collapse
Affiliation(s)
- Maciej Krzystyniak
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK. and School of Science and Technology, Nottingham Trent University, Clifton Campus, Nottingham, NG11 8NS, UK
| | - Kacper Drużbicki
- Faculty of Physics, Adam Mickiewicz University, Umultowska St. 85, 61-614 Poznan, Poland
| | - Giovanni Romanelli
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK.
| | - Matthias J Gutmann
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK.
| | - Svemir Rudić
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK.
| | - Silvia Imberti
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK.
| | - Felix Fernandez-Alonso
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK. and Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK
| |
Collapse
|
4
|
Atomic Quantum Dynamics in Materials Research. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/b978-0-12-805324-9.00007-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
|
5
|
Andreani C, Romanelli G, Senesi R. Direct Measurements of Quantum Kinetic Energy Tensor in Stable and Metastable Water near the Triple Point: An Experimental Benchmark. J Phys Chem Lett 2016; 7:2216-2220. [PMID: 27214268 DOI: 10.1021/acs.jpclett.6b00926] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This study presents the first direct and quantitative measurement of the nuclear momentum distribution anisotropy and the quantum kinetic energy tensor in stable and metastable (supercooled) water near its triple point, using deep inelastic neutron scattering (DINS). From the experimental spectra, accurate line shapes of the hydrogen momentum distributions are derived using an anisotropic Gaussian and a model-independent framework. The experimental results, benchmarked with those obtained for the solid phase, provide the state of the art directional values of the hydrogen mean kinetic energy in metastable water. The determinations of the direction kinetic energies in the supercooled phase, provide accurate and quantitative measurements of these dynamical observables in metastable and stable phases, that is, key insight in the physical mechanisms of the hydrogen quantum state in both disordered and polycrystalline systems. The remarkable findings of this study establish novel insight into further expand the capacity and accuracy of DINS investigations of the nuclear quantum effects in water and represent reference experimental values for theoretical investigations.
Collapse
Affiliation(s)
- Carla Andreani
- Università degli Studi di Roma "Tor Vergata" , Dipartimento di Fisica e Centro NAST, Via della Ricerca Scientifica 1, 00133 Roma, Italy
- Consiglio Nazionale delle Ricerche, CNR-IPCF, Sezione di Messina 98122, Italy
| | - Giovanni Romanelli
- ISIS Neutron Source, Science Technology Facility Council, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - Roberto Senesi
- Università degli Studi di Roma "Tor Vergata" , Dipartimento di Fisica e Centro NAST, Via della Ricerca Scientifica 1, 00133 Roma, Italy
- Consiglio Nazionale delle Ricerche, CNR-IPCF, Sezione di Messina 98122, Italy
| |
Collapse
|
6
|
Romanelli G, Senesi R, Zhang X, Loh KP, Andreani C. Probing the effects of 2D confinement on hydrogen dynamics in water and ice adsorbed in graphene oxide sponges. Phys Chem Chem Phys 2015; 17:31680-4. [PMID: 26556604 DOI: 10.1039/c5cp05240h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We studied the single particle dynamics of water and ice adsorbed in graphene oxide (GO) sponges at T = 293 K and T = 20 K. We used Deep Inelastic Neutron Scattering (DINS) at the ISIS neutron and muon spallation source to derive the hydrogen mean kinetic energy, 〈EK〉, and momentum distribution, n(p). The goal of this work was to study the hydrogen dynamics under 2D confinement and the potential energy surface, fingerprinting the hydrogen interaction with the layered structure of the GO sponge. The observed scattering is interpreted within the framework of the impulse approximation. Samples of both water and ice adsorbed in GO show n(p) functions with almost harmonic and anisotropic line shapes and 〈EK〉 values in excess of the values found at the corresponding temperatures in the bulk. The hydrogen dynamics are discussed in the context of the interaction between the interfacial water and ice and the confining hydrophilic surface of the GO sponge.
Collapse
Affiliation(s)
- Giovanni Romanelli
- Università degli Studi di Roma "Tor Vergata", Dipartimento di Fisica and Centro NAST, Via della Ricerca Scientifica 1, 00133 Roma, Italy
| | - Roberto Senesi
- Università degli Studi di Roma "Tor Vergata", Dipartimento di Fisica and Centro NAST, Via della Ricerca Scientifica 1, 00133 Roma, Italy and Consiglio Nazionale delle Ricerche, CNR-IPCF, Sezione di Messina, Italy
| | - Xuan Zhang
- Graphene Research Centre and Centre for Advanced 2D Materials, Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Kian Ping Loh
- Graphene Research Centre and Centre for Advanced 2D Materials, Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Carla Andreani
- Università degli Studi di Roma "Tor Vergata", Dipartimento di Fisica and Centro NAST, Via della Ricerca Scientifica 1, 00133 Roma, Italy
| |
Collapse
|
7
|
Krzystyniak M, Drużbicki K, Fernandez-Alonso F. Nuclear dynamics in the metastable phase of the solid acid caesium hydrogen sulfate. Phys Chem Chem Phys 2015; 17:31287-96. [PMID: 26549527 DOI: 10.1039/c5cp05636e] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Neutron spectroscopy and first-principles calculations unveil the quantum character of atomic motions in the solid acid CsHSO4.
Collapse
Affiliation(s)
- Maciej Krzystyniak
- ISIS Facility
- Rutherford Appleton Laboratory
- Chilton, Didcot
- UK
- School of Science and Technology
| | - Kacper Drużbicki
- Faculty of Physics
- Adam Mickiewicz University
- 61-614 Poznan
- Poland
- Frank Laboratory of Neutron Physics
| | - Felix Fernandez-Alonso
- ISIS Facility
- Rutherford Appleton Laboratory
- Chilton, Didcot
- UK
- Department of Physics and Astronomy
| |
Collapse
|
8
|
Romanelli G, Fernandez-Alonso F, Andreani C. The Harmonic Picture of Nuclear Mean Kinetic Energies in Heavy Water. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1742-6596/571/1/012003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
9
|
Price DL, Fernandez-Alonso F. An Introduction to Neutron Scattering. EXPERIMENTAL METHODS IN THE PHYSICAL SCIENCES 2013. [DOI: 10.1016/b978-0-12-398374-9.00001-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|