The structural phase transitions of the LiK0.50Rb0.50SO4 mixed crystal
were investigated by Raman spectroscopy and neutron powder diffraction
up to 800 K. The results show two first order structural transitions,
quite analogous to the transitions in LiKSO4. Raman spectra and
diffraction profiles were compatible with average symmetries C-3v(4),
C-6(6) and D-2h(16) for the three observed phases, with increasing
temperature. The transitions, both reconstructive, are smeared over
large temperature intervals, leading to the coexistence of Raman bands
and neutron peaks of the different phases and to an anomalous behavior
of the lattice parameters into these intervals. In the hexagonal phase,
the cell Volume presents a hysteretic behavior depending on the sample
thermal history. Raman spectra of the orthorhombic phase shows the high
rotational disorder of the SO4 ions, associated with the high Li
positional disorder in this high conducting phase.
%0 Journal Article
%1 WOS:000077809300047
%A Righi, A
%A Bourson, P
%A Ayala, AP
%A Pimenta, MA
%A Moreira, RL
%C YUSHIMA URBAN BUILDING 5F, 2-31-22 YUSHIMA, BUNKYO-KU, TOKYO, 113-0034,
JAPAN
%D 1998
%I PHYSICAL SOC JAPAN
%J JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
%K LiK0.50Rb0.50SO4; LiKSO4} Raman diffraction; phase scattering; solid solution; structural transitions; {neutron
%N 12
%P 4285-4290
%R 10.1143/JPSJ.67.4285
%T The structural phase transitions in LiK0.50Rb0.50SO4 mixed crystal
%V 67
%X The structural phase transitions of the LiK0.50Rb0.50SO4 mixed crystal
were investigated by Raman spectroscopy and neutron powder diffraction
up to 800 K. The results show two first order structural transitions,
quite analogous to the transitions in LiKSO4. Raman spectra and
diffraction profiles were compatible with average symmetries C-3v(4),
C-6(6) and D-2h(16) for the three observed phases, with increasing
temperature. The transitions, both reconstructive, are smeared over
large temperature intervals, leading to the coexistence of Raman bands
and neutron peaks of the different phases and to an anomalous behavior
of the lattice parameters into these intervals. In the hexagonal phase,
the cell Volume presents a hysteretic behavior depending on the sample
thermal history. Raman spectra of the orthorhombic phase shows the high
rotational disorder of the SO4 ions, associated with the high Li
positional disorder in this high conducting phase.
@article{WOS:000077809300047,
abstract = {The structural phase transitions of the LiK0.50Rb0.50SO4 mixed crystal
were investigated by Raman spectroscopy and neutron powder diffraction
up to 800 K. The results show two first order structural transitions,
quite analogous to the transitions in LiKSO4. Raman spectra and
diffraction profiles were compatible with average symmetries C-3v(4),
C-6(6) and D-2h(16) for the three observed phases, with increasing
temperature. The transitions, both reconstructive, are smeared over
large temperature intervals, leading to the coexistence of Raman bands
and neutron peaks of the different phases and to an anomalous behavior
of the lattice parameters into these intervals. In the hexagonal phase,
the cell Volume presents a hysteretic behavior depending on the sample
thermal history. Raman spectra of the orthorhombic phase shows the high
rotational disorder of the SO4 ions, associated with the high Li
positional disorder in this high conducting phase.},
added-at = {2022-05-23T20:00:14.000+0200},
address = {YUSHIMA URBAN BUILDING 5F, 2-31-22 YUSHIMA, BUNKYO-KU, TOKYO, 113-0034,
JAPAN},
author = {Righi, A and Bourson, P and Ayala, AP and Pimenta, MA and Moreira, RL},
biburl = {https://www.bibsonomy.org/bibtex/2992f00dc0ac989341aa0a5b0acd560b8/ppgfis_ufc_br},
doi = {10.1143/JPSJ.67.4285},
interhash = {ce1e27be69ddc3b13f73cfc6831d5803},
intrahash = {992f00dc0ac989341aa0a5b0acd560b8},
issn = {0031-9015},
journal = {JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN},
keywords = {LiK0.50Rb0.50SO4; LiKSO4} Raman diffraction; phase scattering; solid solution; structural transitions; {neutron},
number = 12,
pages = {4285-4290},
publisher = {PHYSICAL SOC JAPAN},
pubstate = {published},
timestamp = {2022-05-23T20:00:14.000+0200},
title = {The structural phase transitions in LiK0.50Rb0.50SO4 mixed crystal},
tppubtype = {article},
volume = 67,
year = 1998
}