Luminescent perovskites: recent advances in theory and experiments

2019 ◽  
Vol 6 (11) ◽  
pp. 2969-3011 ◽  
Author(s):  
Zhen Song ◽  
Jing Zhao ◽  
Quanlin Liu
Keyword(s):  
Crystal Structure ◽  
Electronic Structure ◽  
Structure And Properties ◽  
Recent Advances ◽  
Structural Dimensionality ◽  
The Relationship ◽  
Theory And Experiments

This review summarizes previous research on luminescent perovskites, including oxides and halides, with different structural dimensionality. The relationship between the crystal structure, electronic structure and properties is discussed in detail.

Kristallstruktur und Eigenschaften von Chrom(II)-Tetrachloroaluminat/Crystal Structure and Properties of Chromium(II)-Tetrachloroaluminate

2007 ◽  
Vol 62 (5) ◽  
pp. 625-632 ◽  
Author(s):  
Rainhard Müller ◽  
Grigori V. Vajenine ◽  
Ulrich Keßler
Keyword(s):  
Crystal Structure ◽  
Chromium Atom ◽  
Molar Ratio ◽  
Structure And Properties ◽  
Orthorhombic Space Group ◽  
Phase Pure ◽  
Jahn Teller ◽  
Jahn Teller Effect ◽  
Aluminum Trichloride ◽  
The Relationship

Abstract Chromium(II)tetrachloroaluminate can be prepared by reaction of chromium, chromium trichloride and aluminum trichloride in the molar ratio 1 : 1.94 : 5.79 or by reaction of stoichiometric amounts of chromium dichloride and aluminum trichloride. Sublimation of the compound yields phase-pure samples of colourless crystals. Cr(AlCl4)2 crystallizes in the non-centrosymmetric orthorhombic space group Pca21 (No. 29), a = 1511.38(3), b = 604.71(1), c = 1301.76(3) pm. The aggregation of Cr(AlCl4)2 molecules leads to a square-bipyramidal coordination of the chromium atom typical of high-spin d4 ions due to the Jahn-Teller effect. The relationship to centrosymmetric Pd(AlCl4)2 (P21/c) which is built up of similar molecules was established by means of a group-subgroup symmetry tree. The temperature dependence of the magnetic susceptibility agrees with Curie-Weiss behaviour (μeff = 4.70 μB,Θ = −1.3 K).

THE CRYSTAL STRUCTURES OF TlBa2Ca3Cu4O10.5 and Tl2Ba2CuO6

1989 ◽  
Vol 03 (01) ◽  
pp. 41-46 ◽  
Author(s):  
J.Q. HUANG ◽  
J.K. LIANG ◽  
Y.L. ZHANG ◽  
S.S. XIE ◽  
X.R. CHEN ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Crystal Structures ◽  
Powder Diffraction ◽  
Diffraction Method ◽  
Structure And Properties ◽  
X Ray ◽  
The Relationship ◽  
Atomic Parameters

We reported the crystal structures of TlBa 2 Ca 3 Cu 4 O 10.5 and Tl 2 Ba 2 CuO 6. The atomic parameters were determined by means of X-ray powder diffraction method. We also discussed the relationship between the crystal structure and properties as well as the relation among the crystal structures of the high T c superconductors.

CRYSTAL STRUCTURE AND PROPERTIES OF NEW CADMIUMAND THALLIUM-CONTAINING PEROVSKITES

1972 ◽  
Vol 33 (C2) ◽  
pp. C2-241-C2-242
Author(s):  
Yu. N. VENEVTSEV ◽  
A. G. KAPYSHEV ◽  
V. M. LEBEDEV ◽  
V. D. SAL'NIKOV ◽  
G. S. ZHDANOV
Keyword(s):  
Crystal Structure ◽  
Structure And Properties

Structural/Property Relationships for Optical Materials

1993 ◽  
Vol 329 ◽  
Author(s):  
Vivien D.
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Electronic Structure ◽  
Chemical Composition ◽  
Field Strength ◽  
Optical Materials ◽  
Site Occupancy ◽  
Laser Materials ◽  
Crystal Field Strength ◽  
The Matrix

AbstractIn this paper the relationships between the crystal structure, chemical composition and electronic structure of laser materials, and their optical properties are discussed. A brief description is given of the different laser activators and of the influence of the matrix on laser characteristics in terms of crystal field strength, symmetry, covalency and phonon frequencies. The last part of the paper lays emphasis on the means to optimize the matrix-activator properties such as control of the oxidation state and site occupancy of the activator and influence of its concentration.

New Work on Speech Acts

2018 ◽  
Keyword(s):  
Speech Acts ◽  
Speech Act ◽  
Speech Act Theory ◽  
New Work ◽  
Half Century ◽  
Recent Advances ◽  
Current Thinking ◽  
Semantics And Pragmatics ◽  
Recent Developments ◽  
The Relationship

The essays collected in this book represent recent advances in our understanding of speech acts-actions like asserting, asking, and commanding that speakers perform when producing an utterance. The study of speech acts spans disciplines, and embraces both the theoretical and scientific concerns proper to linguistics and philosophy as well as the normative questions that speech acts raise for our politics, our societies, and our ethical lives generally. It is the goal of this book to reflect the diversity of current thinking on speech acts as well as to bring these conversations together, so that they may better inform one another. Topics explored in this book include the relationship between sentence grammar and speech act potential; the fate of traditional frameworks in speech act theory, such as the content-force distinction and the taxonomy of speech acts; and the ways in which speech act theory can illuminate the dynamics of hostile and harmful speech. The book takes stock of well over a half century of thinking about speech acts, bringing this classicwork in linewith recent developments in semantics and pragmatics, and pointing the way forward to further debate and research.

Sign in / Sign up

Export Citation Format

Share Document