Single crystal Raman spectra of an organic semiconductor: KTCNQ

1982 ◽  
Vol 60 (14) ◽  
pp. 1881-1890 ◽  
Author(s):  
André D. Bandrauk ◽  
K. D. Truong ◽  
S. Jandl
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Simple Model ◽  
Single Crystal ◽  
Single Crystals ◽  
Raman Spectra ◽  
Organic Semiconductors ◽  
Organic Semiconductor ◽  
Organic Salt ◽  
Deuterated Analogue

Raman spectra are reported for single crystals of the organic salt KTCNQ (potassium tetracyanoquinodimethane) and its deuterated analogue. Intensities of intramolecular and intermolecular (phonons) vibrations exhibit strong variations at the phase transition temperature associated with a dimmer–monomer transition. A simple model is presented to interpret and correlate these results with previously observed ir intensity anomalies in this and other organic semiconductors.

Single Crystal Raman Spectra of the Phase Transition in KTCNQ

1982 ◽  
Vol 85 (1) ◽  
pp. 297-303 ◽  
Author(s):  
A. D. Bandrauk ◽  
K. D. Truong ◽  
S. Jandl
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Raman Spectra

Growth of Yb:Y2O3 single crystals by the micro-pulling-down method

2004 ◽  
Vol 848 ◽  
Author(s):  
A. Novoselov ◽  
J. H. Mun ◽  
A. Yoshikawa ◽  
G. Boulon ◽  
T. Fukuda
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Raman Spectra ◽  
Lattice Constant ◽  
Decay Time ◽  
Dopant Distribution ◽  
High Homogeneity ◽  
Linear Decrease ◽  
Crystal Laser

ABSTRACT(Ybx Y1-x)2O3 (x = 0.0, 0.005, 0.05, 0.08 and 0.15) promising single crystal laser rods of 4.2 mm in diameter and 15–20 mm in length have been grown from the rhenium crucible by the micro-pulling-down method in Ar + H2(3–4%) atmosphere. Linear decrease of lattice constant with the increase of Yb3+-content was observed. High homogeneity of the Yb3+-dopant distribution has been demonstrated. Absorption, emission and Raman spectra have been recorded and decay time was approximated.

Micro-Raman Spectra of Langbeinite-Type K2Mn2(SO4)3 and (NH4)2Cd2(SO4)3 near the Phase Transition Temperature

2001 ◽  
Vol 70 (11) ◽  
pp. 3452-3456 ◽  
Author(s):  
Akira Sakai ◽  
Masaaki Negishi ◽  
Eiji Fujiwara ◽  
Chikako Moriyoshi ◽  
Kazuyuki Itoh
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Raman Spectra ◽  
Phase Transition Temperature

Ordering of the O(2)…D… O(2) bonds near the phase transition in KD3(SeO3)2 single crystals by D nuclear magnetic resonance

Open Physics ◽  
2013 ◽  
Vol 11 (1) ◽  
Author(s):  
Ae Lim ◽  
Se-Young Jeong
Keyword(s):  
Phase Transition ◽  
Nuclear Magnetic Resonance ◽  
Relaxation Time ◽  
Transition Temperature ◽  
Magnetic Resonance ◽  
Single Crystals ◽  
Phase Transition Temperature ◽  
Experimental Results ◽  
Abrupt Decrease ◽  
Slowing Down

AbstractDeuterium resonance investigations of KD3(SeO3)2 single crystals have been performed near the phase transition temperature T C. There are two types of deuterium bonds in these crystals with different behaviors at this phase transition. Our experimental results show that there are significant changes in the D spinlattice relaxation time T 1 at T C; the abrupt decrease in T 1 near T C can be explained by the critical slowing down of an overdamped soft pseudospin-type deuteron mode. Further, the ordering of the O(2)…D… O(2) bonds is affected by the phase transition, whereas the ordering of the O(1)-D… O(3) bonds is unaffected. The D NMR measurements also show that the D(2) deuteron disordering above T C is dynamic and not static.

Orthoborate Halides with the Formula (M+II)5(BO3)3X: Syntheses, Crystal Structures and Raman Spectra of Eu5(BO3)3Cl and Ba5(BO3)3X (X = Cl, Br)

2011 ◽  
Vol 66 (4) ◽  
pp. 359-365 ◽  
Author(s):  
Olaf Reckeweg ◽  
Armin Schulz ◽  
Francis J. DiSalvo
Keyword(s):  
Single Crystal ◽  
Single Crystals ◽  
Crystal Structures ◽  
Raman Spectra ◽  
Direct Synthesis ◽  
X Ray Diffraction ◽  
Orthorhombic Space Group ◽  
Space Group ◽  
X Ray ◽  
Incremental Volume

Single crystals of Eu5(BO3)3Cl were obtained by serendipity by reacting Eu2O3 and Mg with B2O3 at 1300 K in the presence of an NaCl melt for 13 h in silica-jacketed Nb ampoules. Ba5(BO3)3X (X = Cl, Br) crystals were formed by direct synthesis from appropriate amounts of Ba(OH)2, H3BO3 and the respective barium halide (hydrate) in alumina crucibles kept in the open atmosphere at 1300 K for 13 h. The crystal structures of the title compounds were determined with single-crystal X-ray diffraction. All compounds crystallize isotypically to Sr5(BO3)3Cl in the orthorhombic space group C2221 (no. 20, Z = 4) with the lattice parameters a = 1000.34(7), b = 1419.00(9), c = 739.48(5) pm for Eu5(BO3)3Cl, a = 1045.49(5), b = 1487.89(8), c = 787.01(4) pm for Ba5(BO3)3Cl, and a = 1048.76(7), b = 1481.13(9) and c = 801.22(5) pm for Ba5(BO3)3Br. The Raman spectra of all compounds were acquired and are presented and compared to literature data. The incremental volume of the orthoborate (BO3)3− anion has been determined and is compared to the Biltz volume

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