Insituobservation of phase transition in potassium niobate single crystal by synchrotron radiation topography

1991 ◽  
Vol 59 (16) ◽  
pp. 1952-1953 ◽  
Author(s):  
Jiyong Zhao ◽  
Ping Yang ◽  
Shusheng Jiang ◽  
Xiaoming Jiang ◽  
Jianhua Jiang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Synchrotron Radiation ◽  
Single Crystal ◽  
Potassium Niobate

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

Refinement of the crystal structure of sieleckiite and revision of its symmetry

2017 ◽  
Vol 81 (4) ◽  
pp. 917-922
Author(s):  
Peter Elliott
Keyword(s):  
Crystal Structure ◽  
Synchrotron Radiation ◽  
Single Crystal ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
Aluminium Phosphate ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Phosphate Mineral

AbstractThe crystal structure of the copper aluminium phosphate mineral sieleckiite, Cu3Al4(PO4)2 (OH)12·2H2O, from the Mt Oxide copper mine, Queensland, Australia was solved from single-crystal X-ray diffraction data utilizing synchrotron radiation. Sieleckiite has monoclinic rather than triclinic symmetry as previously reported and is space group C2/m with unit-cell parameters a = 11.711(2), b = 6.9233(14), c = 9.828(2) Å, β = 92.88(3)°, V = 795.8(3) Å3and Z = 2. The crystal structure, which has been refined to R1 = 0.0456 on the basis of 1186 unique reflections with Fo > 4σF, is a framework of corner-, edge- and face- sharing Cu and Al octahedra and PO4 tetrahedra.

Verification of first‐order magnetic phase transition in single crystal iron films

1982 ◽  
Vol 53 (11) ◽  
pp. 7966-7968 ◽  
Author(s):  
F. J. Rachford ◽  
G. A. Prinz ◽  
J. J. Krebs ◽  
K. B. Hathaway
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Iron Films ◽  
First Order ◽  
Order Magnetic Phase Transition

Spontaneous phase transition from relaxor to macrodomain ferroelectric state in single-crystal PbSc0.5Nb0.5O3-BaSc0.5Nb0.5O3 solid solutions

2000 ◽  
Vol 42 (1) ◽  
pp. 161-164 ◽  
Author(s):  
I. P. Raevskii ◽  
V. V. Eremkin ◽  
V. G. Smotrakov ◽  
E. S. Gagarina ◽  
M. A. Malitskaya
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Solid Solutions ◽  
Ferroelectric State ◽  
Spontaneous Phase

Single-crystal to single-crystal phase transition of cucurbit[5]uril hydrochloride hydrates: large water-filled channels transforming to layers of unusual stability

2008 ◽  
pp. 4927 ◽  
Author(s):  
David Bardelang ◽  
Konstantin A. Udachin ◽  
Roberto Anedda ◽  
Igor Moudrakovski ◽  
Donald M. Leek ◽  
...  
Keyword(s):  
Phase Transition ◽  
Single Crystal ◽  
Crystal Phase ◽  
Crystal Phase Transition ◽  
Large Water

scholarly journals Phase transition and proton ordering at 50 K in 3-(pyridin-4-yl)pentane-2,4-dione

2017 ◽  
Vol 73 (6) ◽  
pp. 1172-1178 ◽  
Author(s):  
Khai-Nghi Truong ◽  
Carina Merkens ◽  
Martin Meven ◽  
Björn Faßbänder ◽  
Richard Dronskowski ◽  
...  
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Single Crystal ◽  
Structural Phase ◽  
Pyridyl Ring ◽  
Temperature Phase ◽  
Crystallographic Axis ◽  
Temperature Phase Transition ◽  
Intramolecular Hydrogen ◽  
Low Temperature Phase

Single-crystal neutron diffraction experiments at 100 and 2.5 K have been performed to determine the structure of 3-(pyridin-4-yl)pentane-2,4-dione (HacacPy) with respect to its protonation pattern and to monitor a low-temperature phase transition. Solid HacacPy exists as the enol tautomer with a short intramolecular hydrogen bond. At 100 K, its donor···acceptor distance is 2.450 (8) Å and the compound adopts space group C2/c, with the N and para-C atoms of the pyridyl ring and the central C of the acetylacetone substituent on the twofold crystallographic axis. As a consequence of the axial symmetry, the bridging hydrogen is disordered over two symmetrically equivalent positions, and the carbon–oxygen bond distances adopt intermediate values between single and double bonds. Upon cooling, a structural phase transition to the t 2 subgroup P\bar 1 occurs; the resulting twins show an ordered acetylacetone moiety. The phase transition is fully reversible but associated with an appreciable hysteresis in the large single crystal under study: transition to the low-temperature phase requires several hours at 2.5 K and heating to 80 K is required to revert the transformation. No significant hysteresis is observed in a powder sample, in agreement with the second-order nature of the phase transition.

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