Low temperature detection of phase transitions and relaxation processes in strontium titanate by means of cathodoluminescence

2004 ◽  
Vol 16 (46) ◽  
pp. 8377-8386 ◽  
Author(s):  
B Yang ◽  
P D Townsend ◽  
R Fromknecht
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Strontium Titanate ◽  
Relaxation Processes ◽  
Temperature Detection

DYNAMICS OF THE LOW TEMPERATURE GLASS-LIKE PHASE IN MANGANITES

2003 ◽  
Vol 17 (04n06) ◽  
pp. 842-847
Author(s):  
C. CASTELLANO ◽  
F. CORDERO ◽  
R. CANTELLI ◽  
M. FERRETTI
Keyword(s):  
Distribution Function ◽  
Phase Transitions ◽  
Quantitative Analysis ◽  
Low Temperature ◽  
Imaginary Part ◽  
Lattice Relaxation ◽  
Relaxation Processes ◽  
Temperature Dependent ◽  
Energy Barriers ◽  
Nanostructured State

We report anelastic spectroscopy measurements of La 1-x Ca x MnO 3 performed in order to better characterize the nature of the phase transitions and microscopic lattice relaxation processes present in these materials. A peak in the imaginary part of the elastic susceptibility presents a behaviour typical of inhomogeneous and glass-like systems. We have performed a quantitative analysis calculating the temperature dependent distribution function of the energy barriers of the fluctuations characterizing this nanostructured state.

X-ray study of the low-temperature phase transitions in LiKSO4

1983 ◽  
Vol 4 (1) ◽  
pp. 37-45 ◽  
Author(s):  
P. E. Tomaszewski ◽  
K. Łukaszewicz
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
X Ray ◽  
Low Temperature Phase

Low temperature microstructure and phase transitions in La2−xSrxCuO4 and La2−xBaxCuO4

1991 ◽  
Vol 175 (3-4) ◽  
pp. 301-309 ◽  
Author(s):  
C.H. Chen ◽  
S-W. Cheong ◽  
D.J. Werder ◽  
A.S. Cooper ◽  
L.W. Rupp
Keyword(s):  
Phase Transitions ◽  
Low Temperature

Mössbauer Studies of Fe2+ in Iron Langbeinites and other Crystals with Langbeinite Structure

1998 ◽  
Vol 53 (1-2) ◽  
pp. 27-37 ◽  
Author(s):  
M. Windhaus ◽  
B. D. Mosel ◽  
W. Müller-Warmuth
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
High Temperature ◽  
Low Temperature ◽  
High Spin State ◽  
Cubic Phases ◽  
Debye Temperatures ◽  
Phase Transition Temperatures ◽  
Abrupt Changes ◽  
Temperature Dependences

Abstract 57 Fe Mössbauer spectra have been measured at various temperatures between 4.2 K and 300 K for iron langbeinites A 2 Fe 2^04)3 with A = K, NH 4 , Rb, T1 and magnesium, manganese and cadmium lang-beinites doped with Fe" + . The spectra revealed several contributions whose isomer shifts and quadru-pole splittings have been obtained by fitting program routines. For the high-temperature cubic phases two crystallographically non-equivalent iron sites have been identified, characteristic of Fe2+ in the high-spin state. Abrupt changes of the quadrupole couplings indicated phase transitions; in some cases, the spectra have also revealed several sites for Fe2+ in low temperature phases. From the temperature dependences, phase transition temperatures, crystal field splittings and Debye temperatures have been derived.

SHG Microscopic Studies on Low Temperature Phase Transitions of SrTi 16 O 3 and SrTi 18 O 3

2003 ◽  
Vol 285 (1) ◽  
pp. 19-26 ◽  
Author(s):  
Yoshiaki Uesu ◽  
Ryuhei Nakai ◽  
Noritaka Kato ◽  
Carole Menoret ◽  
Jean-Michel Kiat ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
Microscopic Studies ◽  
Low Temperature Phase

Low-temperature phase transitions and dynamics of ammonium in (NH4)3H(SO4)2 and [(NH4)1−x Rbx]3H(SO4)2 crystals

2001 ◽  
Vol 43 (1) ◽  
pp. 117-126 ◽  
Author(s):  
L. S. Smirnov ◽  
A. I. Baranov ◽  
L. A. Shuvalov ◽  
L. Bobrowicz-Sarga ◽  
I. Natkaniec ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
Low Temperature Phase
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