Comment on “Phase transitions, screening and dielectric response of CsPbBr3” by Š. Svirskas, S. Balčiūnas, M. Šimėnas, G. Usevičius, M. Kinka, M. Velička, D. Kubicki, M. E. Castillo, A. Karabanov, V. V. Shvartsman, M. R. Soares, V. Šablinskas, A. N. Salak, D. C. Lupascu and J. Banys, J. Mater. Chem. A, 2020, 8, 14015

2021 ◽  
Author(s):  
Marek Szafrański
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Low Temperature ◽  
Dielectric Response ◽  
Room Temperature ◽  
Orthorhombic Phase ◽  
Temperature Phase ◽  
Published Report ◽  
Temperature Phase Transition ◽  
Low Temperature Phase

A recently published report on a new low-temperature phase transition in CsPbBr3 was verified. We provide strong evidence that the room-temperature orthorhombic phase of the crystal is stable at least up to 95 K.

Low-temperature phase transition and magnetic properties of K3YbSi2O7

2021 ◽  
Vol 77 (4) ◽  
Author(s):  
Predrag Dabić ◽  
Volker Kahlenberg ◽  
Biljana Krüger ◽  
Marko Rodić ◽  
Sabina Kovač ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Properties ◽  
Phase Transformation ◽  
Low Temperature ◽  
Orthorhombic Phase ◽  
Temperature Phase ◽  
Space Group ◽  
Temperature Phase Transition ◽  
New Type ◽  
Low Temperature Phase

The new ambient-temperature hexagonal (space group P63 /mmc) polymorph of tripotassium ytterbium(III) disilicate (β-K3YbSi2O7) has been synthesized by the high-temperature flux method and subsequently structurally characterized. In the course of the temperature-dependent single-crystal diffraction experiments, a phase transformation of β-K3YbSi2O7 to a novel low-temperature orthorhombic phase (β′-K3YbSi2O7, space group Cmcm) has been observed at about 210 K. β-K3YbSi2O7 is isostructural with K3ErSi2O7, whereas β′-K3YbSi2O7 adopts a new type of structure. Both compounds can be built up from a regular alternation of layers of two types, which are parallel to the (001) plane. In the octahedral layer, YbO6 octahedra are isolated and linked by K1O6+3 polyhedra. The second, slightly thicker sorosilicate layer is formed by a combination of Si2O7 dimers and K2O6+3 polyhedra. The boundary between the layers is a pseudo-kagome oxide sheet based on 3.6.3.6 meshes. The phase transition is due to a tilt of the two SiO4 tetrahedra forming a single dimer which induces a decrease of the Si—O—Si angle between bridging Si—O bonds from 180° (dictated by symmetry in space group P63/mmc) to ≃164°. Magnetic characterization indicates that K3YbSi2O7 remains paramagnetic down to 2 K, showing no apparent influence of the phase transformation on its magnetic properties. Analysis of the magnetization data revealed the positions of the three lowest crystal field levels of the Yb3+ cations, as well as the corresponding projections of their angular momentum on the direction of the magnetic field.

Low-temperature phase transition and isomer-shift systematics in intermediate phases of rare-earth—gold compounds

1975 ◽  
Vol 12 (3) ◽  
pp. 819-823 ◽  
Author(s):  
C. W. Kimball ◽  
A. E. Dwight ◽  
G. M. Kalvius ◽  
B. Dunlap ◽  
M. V. Nevitt
Keyword(s):  
Phase Transition ◽  
Rare Earth ◽  
Low Temperature ◽  
Isomer Shift ◽  
Temperature Phase ◽  
Intermediate Phases ◽  
Gold Compounds ◽  
Temperature Phase Transition ◽  
Low Temperature Phase

Possible low-temperature phase transition of Langmuir–Blodgett films of a charge–transfer complex detected by ESR

1998 ◽  
Vol 327-329 ◽  
pp. 391-394
Author(s):  
Keiichi Ikegami ◽  
Shin-ichi Kuroda ◽  
Tomoyuki Akutagawa ◽  
Taro Konuma ◽  
Takayoshi Nakamura ◽  
...  
Keyword(s):  
Phase Transition ◽  
Charge Transfer ◽  
Low Temperature ◽  
Charge Transfer Complex ◽  
Temperature Phase ◽  
Langmuir Blodgett ◽  
Langmuir Blodgett Films ◽  
Temperature Phase Transition ◽  
A Charge ◽  
Low Temperature Phase

Low‐Temperature Phase Transition of Vanadium Sesquioxide

1970 ◽  
Vol 41 (2) ◽  
pp. 836-838 ◽  
Author(s):  
Mitsuoki Nakahira ◽  
Shigeo Horiuchi ◽  
Hirotoshi Ooshima
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Temperature Phase ◽  
Vanadium Sesquioxide ◽  
Temperature Phase Transition ◽  
Low Temperature Phase

Investigations on the existence of a low-temperature phase transition in triglycine sulphate single crystals

1988 ◽  
Vol 21 (9) ◽  
pp. 1831-1838 ◽  
Author(s):  
M A Gaffar ◽  
L I Al-Houty ◽  
M Al-Muraikhi ◽  
A A Mohamed
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Single Crystals ◽  
Temperature Phase ◽  
Triglycine Sulphate ◽  
Temperature Phase Transition ◽  
Low Temperature Phase

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.

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.

Low-Temperature Phase Transition Detected by ESR in α′-(BEDT-TTF)2IBr2 Single Crystals

2011 ◽  
Vol 41 (2-4) ◽  
pp. 363-370
Author(s):  
Alisa Chernenkaya ◽  
Marina Kirman ◽  
Alexei Dmitriev ◽  
Roman Morgunov ◽  
Oksana Koplak ◽  
...  
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Single Crystals ◽  
Temperature Phase ◽  
Temperature Phase Transition ◽  
Low Temperature Phase

Magnetoelastic properties of ζ-Mn5Ge2 in the range of the low-temperature phase transition

1988 ◽  
Vol 72 (2) ◽  
pp. 233-235 ◽  
Author(s):  
K.B. Vlasov ◽  
A.Z. Menshikov ◽  
E.A. Rosenberg ◽  
A.E. Teplykh ◽  
A.V. Chetverikov
Keyword(s):  
Phase Transition ◽  
Low Temperature ◽  
Temperature Phase ◽  
Magnetoelastic Properties ◽  
Temperature Phase Transition ◽  
Low Temperature Phase
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