Topic
Valency
About: Valency is a research topic. Over the lifetime, 1632 publications have been published within this topic receiving 26141 citations.
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TL;DR: In this article, the authors found that FePS 3, VPS 3 and V 0.78 PS 3 crystals have electrical conductivity higher than 10 −5 S cm −1, while MnPS 3, NiPS3, and ZnPS 3 have conductivities lower than 10−9 S cm−1 at room temperature.
70 citations
Patent•
26 Aug 2005TL;DR: In this article, a general composition formula expressed by MmAaBbOoNn:Z is given to provide a phosphor having an emission spectrum with a broad peak in a range from yellow color to red color (580 nm to 680 nm) and an excellent excitation band on the longer wavelength side.
Abstract: To provide a phosphor having an emission spectrum with a broad peak in a range from yellow color to red color (580 nm to 680 nm) and an excellent excitation band on the longer wavelength side from near ultraviolet/ultraviolet of excitation light to visible light (250 nm to 550 nm), and having an improved emission intensity. The phosphor is provided, which is given by a general composition formula expressed by MmAaBbOoNn:Z, (wherein element M is more than one kind of element having bivalent valency, element A is more than one kind of element having tervalent valency selected from the group consisting of Al, Ga, In, Tl, Y, Sc, P, As, Sb, and Bi, element B is more than one kind of element having tetravalent valency, O is oxygen, N is nitrogen, and element Z is more than one kind of element selected from rare earth elements or transitional metal elements, satisfying m>0, a>0, b>0 o≧0, and n=2/3m+a+4/3b−2/3o), and further containing boron and/or fluorine.
70 citations
TL;DR: Several pure cesium uranate phases were prepared and measured with X-ray diffraction (XRD) and Xray photoelectron spectroscopy (XPS) and detailed XPS scans of the main photo-electron peaks (U 4f, Cs 3d, O 1s and valence band) were made.
70 citations
TL;DR: This Viewpoint provides a current perspective on the field of mixed-valence frameworks, where the property is either intrinsic or generated postsynthetically via an external stimulus, highlighting the future potential for exploiting mixed valency in extended solid-state systems.
Abstract: The fundamentally important phenomenon of mixed valency has been discussed in detail over the past 50 years, predominantly in the context of dinuclear complexes, which are used as model systems for understanding electron delocalization in more complex biological and physical systems. Very recently, mixed valency has been shown to be an important mechanism for charge transfer, leading to delocalization and conductivity in two- and three-dimensional framework materials such as metal–organic frameworks and related systems including covalent organic frameworks and semicrystalline semiconducting metal–organic graphenes. This Viewpoint provides a current perspective on the field of mixed-valence frameworks, where the property is either intrinsic or generated postsynthetically via an external stimulus. Aspects of the spectroscopy and applications of these materials are also discussed, highlighting the future potential for exploiting mixed valency in extended solid-state systems.
69 citations
TL;DR: In this paper, the incorporation of additives (In 3+ Ag 1+ or Na 1+ ) into cadmium oxide has been studied by means of precision measurements of the lattice parameter a.
69 citations