Temperature Dependence of Photoluminescence in Mn-Doped ZnS Retrieved after the Pressure-Induced Structural Phase Transition

1999 ◽  
Vol 175 (2) ◽  
pp. 715-724 ◽  
Author(s):  
H. Hanzawa ◽  
M. Kobayashi ◽  
O. Matsuda ◽  
K. Murase ◽  
W. Giriat
Keyword(s):  
Phase Transition ◽  
Temperature Dependence ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Mn Doped

NQR, NMR, and X-ray crystal structure studies of [4-C2H5-C6H4NH3]2MBr4 (M=Zn, Cd)

2018 ◽  
Vol 73 (9) ◽  
pp. 611-616
Author(s):  
Hideta Ishihara ◽  
Hisashi Honda ◽  
Ingrid Svoboda ◽  
Hartmut Fuess
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Temperature Dependence ◽  
Benzene Ring ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Unit Cell ◽  
Organic Layers ◽  
Nuclear Magnetic Resonance Spectra ◽  
Quadrupole Resonance

AbstractThe crystal structure of [4-C2H5-C6H4NH3]2ZnBr4 (1) has been determined at 150(2) K: triclinic, P1̅, a=724.82(2), b=1194.20(4), c=1322.26(4) pm, α=74.151(3), β=80.887(3), γ=80.434(3)°, and Z=2. There are two crystallographically independent cations in the unit cell of 1: one has its benzene ring perpendicular to the crystallographic a axis of the unit cell and the other one has its benzene ring perpendicular to the c axis. These cations are alternatingly located along the c axis and form organic layers, and the ZnBr4 anions form inorganic layers in between. Zn–Br···H–N hydrogen bonds are formed between cations and anions. In accordance with the crystal structure, four nuclear quadrupole resonance (NQR) lines of 81Br were observed. The temperature dependence of the 81Br NQR frequencies between 77 and 320 K shows a peculiar feature which is not due to a structural phase transition. The measurement of 13C nuclear magnetic resonance spectra at around T=340 K indicates a redistribution of cations. The temperature dependence of 81Br NQR frequencies and differential thermal analysis measurements show that [4-C2H5-C6H4NH3]2CdBr4 (2) undergoes a structural phase transition at around 190 K.

Enhanced ferromagnetism in Mn-doped TiO2 films during the structural phase transition

2006 ◽  
Vol 140 (11-12) ◽  
pp. 514-518 ◽  
Author(s):  
J.P. Xu ◽  
Y.B. Lin ◽  
Z.H. Lu ◽  
X.C. Liu ◽  
Z.L. Lu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Structural Phase ◽  
Tio2 Films ◽  
Doped Tio2 ◽  
Mn Doped
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