scholarly journals A single-crystal X-ray study on the low-temperature phase transitions in leonite-type compounds

2000 ◽  
Vol 56 (s1) ◽  
pp. s362-s362
Author(s):  
B. Hertweck ◽  
T. Armbruster ◽  
E. Libowitzky
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Single Crystal ◽  
Temperature Phase ◽  
X Ray ◽  
Low Temperature Phase

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

Single-Crystal X-Ray Scattering Study of Superstructures and Phase Transitions in Graphite-Hno3 and Graphite-Br2 Intercalation Compounds

1982 ◽  
Vol 20 ◽  
Author(s):  
R. Moret ◽  
R. Comes ◽  
G. Furdin ◽  
H. Fuzellier ◽  
F. Rousseaux
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Room Temperature ◽  
Temperature Phase ◽  
Temperature Structure ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Temperature Liquid ◽  
Low Temperature Phase

ABSTRACTIn α-C5n-HNO3 the condensation of the room-temperature liquid-like diffuse ring associated with the disorder-order transition around 250 K is studied and the low-temperature. superstructure is examined.It is found that β-C8n-HNO3 exhibits an in-plane incommensurate order at room temperature.Two types of graphite-Br2 are found. Low-temperature phase transitions in C8Br are observed at T1 ≍ 277 K and T2 ≍ 297 K. The room-temperature structure of C14Br is reexamined. Special attention is given to diffuse scattering and incommensurability.

Reversiblechair↔skewconformational interconversion of 1,3,2-dioxaphosphorinane ring in the solid state

2016 ◽  
Vol 72 (1) ◽  
pp. 117-125 ◽  
Author(s):  
Katarzyna Anna Ślepokura
Keyword(s):  
Phase Transitions ◽  
Single Crystal ◽  
Dihydroxyacetone Phosphate ◽  
Temperature Phase ◽  
Coordination Geometry ◽  
Phosphate Anion ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cyclic Phosphate ◽  
Low Temperature Phase

β-NH4[(MeO)2cDHAP] (where cDHAP is cyclic dihydroxyacetone phosphate) has been investigated by X-ray crystallography in the temperature range 350–100 K. Three reversible single-crystal-to-single-crystal phase transitions have been examined and four phases (high-, room-, medium- and low-temperature phase, HTP, RTP, MTP and LTP, respectively) have been structurally determined: HTP (at 350 K,P21/a,Z= 24), RTP (290 K, P \overline{1},Z= 12), MTP (205 K,P21/a,Z= 4) and LTP (100 K, P \overline{1},Z= 24). Various puckering modes of the 1,3,2-dioxaphosphorinane ring of the organic cyclic phosphate anion have been revealed in the crystal:chairandskew. Thechair↔skewring flipping, which has been shown to take place during the phase transitions, results in various populations ofskewandchairconformers in different phases. The flexibility in the coordination geometry of ammonium cations is considered to assist in the conformational flexibility of the dioxaphosphorinane ring.

An X-ray scattering study of the low-temperature phase transitions of LiKSO4

1995 ◽  
Vol 7 (44) ◽  
pp. 8445-8452 ◽  
Author(s):  
A Desert ◽  
A Gibaud ◽  
A Righi ◽  
U A Leitao ◽  
R L Moreira
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Temperature Phase ◽  
X Ray ◽  
X Ray Scattering ◽  
Scattering Study ◽  
Low Temperature Phase ◽  
Ray Scattering

X-Ray Diffractometric Examination of Low-Temperature Phase Transformations in Single-Crystal Strontium Titanate

1963 ◽  
Vol 7 ◽  
pp. 136-145 ◽  
Author(s):  
Farrel W. Lytle
Keyword(s):  
Low Temperature ◽  
Single Crystal ◽  
Lattice Parameter ◽  
Temperature Curve ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
Tetragonal Modification ◽  
X Ray ◽  
Line Splitting ◽  
Low Temperature Phase

AbstractThe lattice parameters of single-crystal SrTiO2 were determined by X-ray diffraction as a function of temperature from 4.2 to 300°K. Three significant regions were found: from 65 to 110°K a tetragonal modification, exists (c/a = 1.00056); from 35 to 55°K, line splitting consistent with orthorhornbic symmetry was observed, and at 10°K an anomalous maximum in the lattice parameter vs. temperature curve was found which suggested a third structure transformation. In the tetragonal region (at 78°K) the formation of a domain structure was observed with a polarising microscope. The low-temperature X-ray technique and X-ray cryostat are described.

X-Ray Diffraction Study of the Low Temperature Phase Transitions of CuBrTe and CuITe

1992 ◽  
Vol 61 (12) ◽  
pp. 4659-4660 ◽  
Author(s):  
Takashi Sakuma ◽  
Tadahiro Kaneko ◽  
Haruyuki Takahashi ◽  
Kōji Honma ◽  
Robert B. Beeken
Keyword(s):  
Phase Transitions ◽  
Low Temperature ◽  
Diffraction Study ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Low Temperature Phase
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