Study of Raman spectra and structural phase transition in the system Ba2Bi4−xLaxTi5O18

1996 ◽  
Vol 218 (1-2) ◽  
pp. 91 ◽  
Author(s):  
Jianjun Liu ◽  
Chunxiao Gao ◽  
Guangtian Zou ◽  
Yanrong Jin
Keyword(s):  
Phase Transition ◽  
Raman Spectra ◽  
Structural Phase Transition ◽  
Structural Phase

scholarly journals Manifestation of magnetoelastic interactions in Raman spectra of HoxNd1−xFe3(BO3)4 crystals

2018 ◽  
Vol 08 (02) ◽  
pp. 1850011 ◽  
Author(s):  
A. S. Krylov ◽  
S. N. Sofronova ◽  
I. A. Gudim ◽  
S. N. Krylova ◽  
Rajesh Kumar ◽  
...  
Keyword(s):  
Phase Transition ◽  
Raman Spectra ◽  
Structural Phase Transition ◽  
Solid Solutions ◽  
Order Parameter ◽  
Soft Mode ◽  
Magnetic Phase ◽  
Structural Phase ◽  
Exchange Interactions ◽  
Magnetoelastic Interaction

Raman spectra of Ho[Formula: see text]NdxFe(BO3)4 ([Formula: see text], 0.75, 0.5, 0.25) have been studied in temperature range 10–400[Formula: see text]K. Two compositions ([Formula: see text], [Formula: see text]) demonstrate structural phase transition with soft mode restoration. The addition of Nd atoms increases interatomic spacing and decreases the temperature of structural phase transition. The solid solutions ([Formula: see text], 0.5, 0.25) demonstrate the emergence of the peaks corresponding to magnetoelastic interaction below Néel temperature. The order parameter of the magnetic phase transition has been determined. The equal concentrations of holmium and neodymium atoms prevent magnon soft modes condensation caused by exchange interactions in Fe–O–Fe chains are observed. Calculations confirm the data obtained in the experiment.

STRUCTURAL ASPECTS OF KMg1/3Nb2/3PO5 (KMNP), A KTP ANALOGUE — RAMAN AND FTIR SPECTROSCOPIC STUDY

2001 ◽  
Vol 10 (03) ◽  
pp. 345-353 ◽  
Author(s):  
M. J. BUSHIRI ◽  
V. U. NAYAR
Keyword(s):  
Phase Transition ◽  
Spectroscopic Study ◽  
Raman Spectra ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Ftir Spectra ◽  
Ktp Crystal ◽  
Structural Aspects

Raman and FTIR spectra of KMg1/3Nb2/3PO5 (KMNP) crystal are recorded. The observed bands are assigned mainly in terms of vibrations of NbO6 octahedra and PO4 tetrahedra. The NbO6 octahedra in the crystal are distorted. Corner shared octahedra are present in the KMNP structure. The intense ν1 band at 890 cm-1 in the Raman spectra indicates an ordering in the crystal. The TiO6 octahedra in KTP crystal are more distorted than those of NbO6 octahedra in KMNP. The presence of Mg ions disrupts Nb–O–Nb chains leading to a distortion of NbO6 octahedra different from that of TiO6 . The PO4 tetrahedra in the crystal are linearly distorted. No structural phase transition is observed in the crystal when temperature is lowered to 77 K.

scholarly journals Raman Spectra and Structural Phase Transition in Pr3Sb5O12Crystal

2015 ◽  
Vol 486 (1) ◽  
pp. 86-90
Author(s):  
Abdumalik Hojiboev ◽  
Aleksandr Oreshonkov ◽  
Maksud Umarov ◽  
Alexander Vtyurin
Keyword(s):  
Phase Transition ◽  
Raman Spectra ◽  
Structural Phase Transition ◽  
Structural Phase

Raman spectra and structural phase transition in nanocrystalline lead lanthanum titanate

2001 ◽  
Vol 89 (12) ◽  
pp. 8121-8126 ◽  
Author(s):  
Q. F. Zhou ◽  
H. L. W. Chan ◽  
Q. Q. Zhang ◽  
C. L. Choy
Keyword(s):  
Phase Transition ◽  
Raman Spectra ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Lanthanum Titanate

Structural Phase Transition of Multilayer VSe2

2020 ◽  
Vol 12 (22) ◽  
pp. 25143-25149 ◽  
Author(s):  
Dian Li ◽  
Xiong Wang ◽  
Chi-ming Kan ◽  
Daliang He ◽  
Zejun Li ◽  
...  
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Structural Phase

scholarly journals Raman spectroscopy study of the behavior of the soft mode in a structural phase transition in the Pr3Sb5O12 crystal

2015 ◽  
Vol 57 (11) ◽  
pp. 2286-2289 ◽  
Author(s):  
A. S. Oreshonkov ◽  
A. K. Khodzhibaev ◽  
A. S. Krylov ◽  
M. F. Umarov ◽  
A. N. Vtyurin
Keyword(s):  
Phase Transition ◽  
Raman Spectroscopy ◽  
Structural Phase Transition ◽  
Soft Mode ◽  
Structural Phase ◽  
Spectroscopy Study
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