scholarly journals Tilting and twisting in a novel perovzalate, K3NaMn(C2O4)3

2021 ◽  
Vol 57 (20) ◽  
pp. 2567-2570 ◽  
Author(s):  
Xiaolong He ◽  
Xinyuan Zhang ◽  
Bifa Ji ◽  
Wenjiao Yao ◽  
Philip Lightfoot ◽  
...  
Keyword(s):  
Perovskite Structure ◽  
Oxalate Ligand ◽  
Octahedral Tilting

A unique variant on the perovskite structure, K3NaMn(C2O4)3, has been identified with unconventional octahedral tilting, interpenetration of two topologically identical perovskite-like frameworks and an unusual, twisted oxalate ligand.

scholarly journals High-pressure structural behaviour of CaIrO3polymorphs

2014 ◽  
Vol 70 (a1) ◽  
pp. C267-C267 ◽  
Author(s):  
Tiziana Boffa Ballaran ◽  
Kanchana Kularatne ◽  
Reidar Trønnes
Keyword(s):  
Perovskite Structure ◽  
Perovskite Phase ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Structural Behaviour ◽  
Space Groups ◽  
Atomic Structures ◽  
Mgsio3 Perovskite ◽  
Octahedral Tilting ◽  
Increasing Temperature

The two known polymorphs of CaIrO3 crystallize int the orthorhombic space groups Pbnm and Cmcm. These compounds have been the focus of much research in the Earth sciences community because they are isostructural with MgSiO3 perovskite and post-perovskite structures which are likely the most abundant minerals in the Earth's lower mantle. CaIrO3 post-perovskite is stable at ambient conditions and transforms at 1-3 GPa and at temperatures above 13500C to the CaIrO3 perovskite structure providing an ideal low pressure and low temperature analogue for the MgSiO3 perovskite to post-perovskite phase transformation which occurs at the extreme conditions of 125 GPa and 2500 K. However, in order to assess whether the CaIrO3 compounds can be used as analogues of MgSiO3 phases, a correct knowledge of their atomic structures and their response to changes in pressure and temperature is essential. In this study the structural behavior of both CaIrO3 polymorphs has been investigated using single-crystal X-ray diffraction at different pressures up to 10 GPa. The orthorhombic distortion of CaIrO3 perovskite derives from the cubic perovskite aristotype by tilting of the octahedral units. These tilts are very large and their variation with pressure is clearly different from the tilting reported for other Ca-oxide perovskites giving rise to a much stiffer structure. The CaIrO3 post-perovskite phase has a layered structure consisting of alternating sheets of Ca atoms and distorted IrO6 octahedra which share edges to form rows running parallel to [100]. With increasing pressure the octahedral tilting remains practically constant and compression of the post-perovskite structure occurs as a result of compression of Ca layers. With increasing temperature, instead, the octahedral tilting increases giving rise to smaller distances between oxygens of adjacent octahedra whose repulsion likely causes the transformation to the CaIrO3 perovskite structure.

Effects of octahedral tilting on the site of substitution of manganese in CaTiO3

2021 ◽  
Vol 207 ◽  
pp. 116688
Author(s):  
Russell A. Maier ◽  
Kevin F. Garrity ◽  
Andrew Ozarowski ◽  
Matthew P. Donohue ◽  
Giannantonio Cibin ◽  
...  
Keyword(s):  
Octahedral Tilting

scholarly journals Tilt and Shift Polymorphism in Molecular Perovskites

2021 ◽  
Author(s):  
Stefan Burger ◽  
Shivani Grover ◽  
Keith Butler ◽  
Hanna Boström ◽  
Ricardo Grau-Crespo ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Perovskite Structure

Molecular perovskites, i.e. ABX3 coordination polymers with a perovskite structure are a chemical diverse material platform for studying properties of fundamental and applied purposes such as barocalorics and improper ferroelectrics....

scholarly journals Strongly Anharmonic Octahedral Tilting in Two-Dimensional Hybrid Halide Perovskites

ACS Nano ◽  
2021 ◽  
Author(s):  
Matan Menahem ◽  
Zhenbang Dai ◽  
Sigalit Aharon ◽  
Rituraj Sharma ◽  
Maor Asher ◽  
...  
Keyword(s):  
Two Dimensional ◽  
Halide Perovskites ◽  
Octahedral Tilting

scholarly journals Cubic Perovskite Structure of Black Formamidinium Lead Iodide, α-[HC(NH2)2]PbI3, at 298 K

2015 ◽  
Vol 6 (16) ◽  
pp. 3209-3212 ◽  
Author(s):  
Mark T. Weller ◽  
Oliver J. Weber ◽  
Jarvist M. Frost ◽  
Aron Walsh
Keyword(s):  
Perovskite Structure ◽  
Lead Iodide

Sputtered lead scandium tantalate thin films: Pb4+ in B sites in the perovskite structure

1997 ◽  
Vol 82 (11) ◽  
pp. 5686-5694 ◽  
Author(s):  
R. W. Whatmore ◽  
Z. Huang ◽  
M. Todd
Keyword(s):  
Thin Films ◽  
Perovskite Structure
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