Orthorhombic to tetragonal phase transition in the RBa2Cu3O7−δ system studied by in - situ X-ray powder diffraction measurements

Crystal structure of compositionally homogeneous, nanocrystalline ZrO2–CeO2 solutions was investigated by X-ray powder diffraction as a function of temperature for compositions between 50 and 65 mol % CeO2. ZrO2-50 and 60 mol % CeO2 solid solutions, which exhibit the t′-form of the tetragonal phase at room temperature, transform into the cubic phase in two steps: t′-to-t″ followed by t″-to-cubic. But the ZrO2-65 mol % CeO2, which exhibits the t″-form, transforms directly to the cubic phase. The results suggest that t′-to-t″ transition is of first order, but t″-to-cubic seems to be of second order.

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Development of Time-Resolved High-Temperature X-Ray Powder Diffraction Apparatus and In Situ Observation of Phase Transition inYBa2Cu3O7-x

Japanese Journal of Applied Physics ◽

10.1143/jjap.33.4779 ◽

1994 ◽

Vol 33 (Part 1, No. 8) ◽

pp. 4779-4781 ◽

Cited By ~ 8

Author(s):

Yasunao Oyama ◽

Masashi Hasegawa ◽

Humihiko Takei

Keyword(s):

Phase Transition ◽

High Temperature ◽

Powder Diffraction ◽

In Situ Observation ◽

Time Resolved ◽

X Ray

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Variable temperature and high-pressure crystal chemistry of perovskite formamidinium lead iodide: a single crystal X-ray diffraction and computational study

Chemical Communications ◽

10.1039/c7cc00995j ◽

2017 ◽

Vol 53 (54) ◽

pp. 7537-7540 ◽

Cited By ~ 22

Author(s):

Shijing Sun ◽

Zeyu Deng ◽

Yue Wu ◽

Fengxia Wei ◽

Furkan Halis Isikgor ◽

...

Keyword(s):

Phase Transition ◽

High Pressure ◽

Low Temperature ◽

Tetragonal Phase ◽

Computational Study ◽

Variable Temperature ◽

X Ray Diffraction ◽

Lead Iodide ◽

X Ray ◽

Tetragonal Phase Transition

Single crystals of [(NH2)2CH]PbI3 undergo a cubic-to-tetragonal phase transition at low temperature and high pressure.

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ESR-Untersuchungen zum Jahn-Teller-Effekt des Cu2+-Ions in oxidischen Perowskiten

Zeitschrift für Naturforschung A ◽

10.1515/zna-1969-1009 ◽

1969 ◽

Vol 24 (10) ◽

pp. 1518-1525

Author(s):

C. Friebel ◽

D. Reinen

Keyword(s):

Phase Transition ◽

Tetragonal Phase ◽

Esr Spectra ◽

Ligand Field ◽

X Ray ◽

Field Spectroscopy ◽

Jahn Teller ◽

Low X ◽

Ligand Field Parameters ◽

Tetragonal Phase Transition

Abstract The ESR-powder-spectra of the perovskite-mixed-crystals M2II (CuxZn1-xW)O6 [MII=Sr, Ba] and Sr2(CuxZn1-xTe)O6 , which have been investigated by means of conventional X-ray-techniques and ligand-field-spectroscopy 1,2, are described and the results extensively discussed. The conclusions can be summarized as follows: (a) At very low x-values isolated, dynamically Jahn-Teller-distorted CuO6-octahedra are present in the cubic matrices, which can be frozen into tetragonally elongated polyhedra at 4.2 °K; (b) At high x-values the CuO6-entities are statically JT-distorted with the long axes lined up along the c-axis of the macroscopically tetragonal phases; (c) The ESR-spectra around the cubic-tetragonal phase-transition are complex, containing signals of obviously magnetically coupled Cu2+-ions; (d) The g-values "follow" the ligand-field-parameters quantitatively. Comparative data of some other compounds are given.

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In situ X-ray diffraction analysis of Pb(Zr0.52Ti0.48)O3 phase transition in CoFe2O4/Pb(Zr0.52Ti0.48)O3 2-2-type bilayer films

Powder Diffraction ◽

10.1154/1.3478981 ◽

2010 ◽

Vol 25 (S1) ◽

pp. S45-S47

Author(s):

Ji-Ning Wang ◽

Wei-Li Li ◽

Xiao-Liang Li ◽

W. D. Fei

Keyword(s):

Phase Transition ◽

Diffraction Analysis ◽

Magnetoelectric Effect ◽

Bilayer Film ◽

X Ray Diffraction ◽

Si Substrate ◽

X Ray ◽

Bilayer Films ◽

Tetragonal Phase Transition

A 2-2-type nanostructure bilayer film of CoFe2O4/Pb(Zr0.52Ti0.48)O3 was successfully prepared on the (111)Pt/Ti/SiO2/Si substrate. The Pb(Zr0.52Ti0.48)O3 layer in the bilayer film is (111) oriented and is a mixture of tetragonal and monoclinic phases. The results from an in situ X-ray diffraction analysis of the multiferroic bilayer film under statistic magnetic field indicate that the monoclinic-tetragonal phase transition was induced by magnetostriction of the CoFe2O4 layer. A large magnetoelectric effect was obtained probably because of the different polarization directions of the tetragonal and monoclinic phases.

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