An infrared spectroscopic study of the internal modes of sodium nitrate: implications for the structural phase transition

1990 ◽  
Vol 2 (25) ◽  
pp. 5517-5527 ◽  
Author(s):  
M J Harris ◽  
E K H Salje ◽  
B K Guttler
Keyword(s):  
Phase Transition ◽  
Spectroscopic Study ◽  
Structural Phase Transition ◽  
Sodium Nitrate ◽  
Structural Phase ◽  
Infrared Spectroscopic Study ◽  
Infrared Spectroscopic

High-pressure spectroscopic study of silver azide

RSC Advances ◽  
2016 ◽  
Vol 6 (85) ◽  
pp. 82270-82276 ◽  
Author(s):  
Dongmei Li ◽  
Peifen Zhu ◽  
Yanju Wang ◽  
Bingbing Liu ◽  
Junru Jiang ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Spectroscopic Study ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Silver Azide

The pressure-induced structural phase transition and evolution of N3− in AgN3 are revealed by spectroscopic study.

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.

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