Ln3[SiON3]O (Ln = La, Ce, Pr) – Three Oxonitridosilicate Oxides with Crystal Structures Derived from the Anti‐Perovskite Structure Type

Kechele, Juliane A.; Schmolke, Christian; Lupart, Saskia; Schnick, Wolfgang

doi:10.1002/zaac.200900274

Cited by 17 publications

(16 citation statements)

References 36 publications

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“…Owing to the excellent tolerance of the antiperovskite‐type structure to many elements, much room for the future exploration of novel host materials remains. For instance, a series of oxonitridosilicate oxides, RE 3 [SiON 3 ]O (RE = La, Ce, Pr, Gd) with antiperovskite structures, were reported by Schnich's group . In the crystal structure, two different RE atoms are located at the vertices of the elongated ORE 6 octahedra, and the isolated SiON 3 tetrahedra are located in the cavities of the corner‐sharing ORE 6 frameworks.…”

Section: Emerging Functionalities Of Antiperovskitesmentioning

confidence: 99%

Antiperovskites with Exceptional Functionalities

et al. 2019

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ABX3 perovskites, as the largest family of crystalline materials, have attracted tremendous research interest worldwide due to their versatile multifunctionalities and the intriguing scientific principles underlying them. Their counterparts, antiperovskites (X3BA), are actually electronically inverted perovskite derivatives, but they are not an ignorable family of functional materials. In fact, inheriting the flexible structural features of perovskites while being rich in cations at X sites, antiperovskites exhibit a diverse array of unconventional physical and chemical properties. However, rather less attention has been paid to these “inverse” analogs, and therefore, a comprehensive review is urgently needed to arouse general concern. Recent advances in novel antiperovskite materials and their exceptional functionalities are summarized, including superionic conductivity, superconductivity, giant magnetoresistance, negative thermal expansion, luminescence, and electrochemical energy conversion. In particular, considering the feasibility of the perovskite structure, a universal strategy for enhancing the performance of or generating new phenomena in antiperovskites is discussed from the perspective of solid‐state chemistry. With more research enthusiasm, antiperovskites are highly anticipated to become a rising star family of functional materials.

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Section: Emerging Functionalities Of Antiperovskitesmentioning

confidence: 99%

Antiperovskites with Exceptional Functionalities

et al. 2019

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“…Consequently, the latter represents in addition to e.g. Sr 3 Ln 10 Si 18 Al 12 O 18 N 36 ( Ln = Ce, Pr, Nd),17 t‐La 3 SiN 3 O,13 and LiLa 5 Si 4 N 10 O8 another oxonitridosilicate (SiON) with colored crystals. Possibly, the color originates from color centers.…”

Section: Resultsmentioning

confidence: 99%

“…From a thermodynamic point of view, chemical bonds to nitrogen are less stable than the bonds to oxygen, thus most of the less condensed (oxo)nitridosilicates are sensitive towards hydrolysis, whereas the high degree of condensation of (oxo)nitridosilicates with three‐dimensional frameworks usually prevents dissociation kinetically 1,12. A synthetic approach to this compound class is facilitated by high‐temperature reactions,13,14 flux methods6,8,9 and precursor routes 1,15. For high‐temperature syntheses often radio‐frequency furnaces have been used, which allow fast heating and high quenching rates.…”

Section: Introductionmentioning

confidence: 99%

Process Engineering Aspects of Vertical Column Photobioreactors for Mass Production of Microalgae

Pawar

2016

ChemBioEng Reviews

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Microalgae cultivation can be made sustainable on a large‐scale by lowering the costs associated with closed photobioreactors (PBRs). It can be achieved through the appropriate design of closed PBRs to achieve maximum productivity. The cultivation of microalgae is very sensitive to temperature, pH, shear stress, irradiance, and operating conditions of the PBR. The understanding of design parameters is a prerequisite for scale‐up of gas‐sparged vertical column PBRs. The hydrodynamics of gas‐sparged vertical column PBRs play a very critical role in the optimum production of microalgae and avoiding the carbon loss (unabsorbed CO2 out of total supplied). In this article, the effects of design parameters on microalgae productivity in various vertical column PBRs, i.e., flat panel, bubble column, and airlift (draft tube) column, are critically reviewed. The microalgae production in PBRs is essentially a three‐phase operation. Hence, the hydrodynamic aspects of two‐ and three‐phase flow in the vertical column PBR are emphasized with respect to its scale‐up prospect. The flow regimes and CFD modeling aspects of gas‐sparged PBRs are also covered in this review.

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“…The mixed oxynitrides Ln 3 [SiON 3 ]O adopt structures that are related to the anti-perovskite structure with a framework composed of corner-sharing Ln 6 O octahedral. 38 The interstices in the structure are occupied by SiO 3 N tetrahedral and these units appear to impart considerable reactivity on these compounds; these phases are sensitive to air and water whereas analogous compounds where the interstitial species are bonded to the framework are relatively inert and stable.…”

Section: View Onlinementioning

confidence: 99%