Crystal structures of neodymium metaphosphate (NdP3O9) and ultraphosphate (NdP5O14)
15 Feb 1974-Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry (International Union of Crystallography)-Vol. 30, Iss: 2, pp 468-474
About: This article is published in Acta Crystallographica Section B Structural Crystallography and Crystal Chemistry.The article was published on 1974-02-15. It has received 155 citations till now. The article focuses on the topics: Metaphosphate & Neodymium.
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TL;DR: In this paper, the skeleton structures for fast alkali-ion transport were identified and analyzed using single-crystal x-ray analysis, and the system Na1+xZr2Si2PO12 was prepared, analyzed structurally and ion exchanged reversibly with Li+, Ag+, and K+ ions.
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TL;DR: The structure of NdAl3(BO3)4, determined by single-crystal x-ray analysis, is rhombohedral with space group R32 and cell parameters a = 9.3416, c = 7.3066, Z = 3.033, and Rw = 0.037 as discussed by the authors.
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TL;DR: In this paper, rare earth phosphates were characterized by catalytic activities on dehydration reaction of 2-propanol, cracking/dehydrogenation of cumene, and isomerization reaction of butene.
Abstract: Various rare earth phosphates [rare earth elements: R = La, Ce, Pr, Nd, Sm, Yb, and Y; phosphates: Monazite-type, Xenotime-type, Rhabdophane-type, and Weinshenkite-type orthophosphates RPO4, polyphosphate R(PO3)3, and ultraphosphate RP5O14] were synthesized by heating the mixtures of each rare earth oxide and diammonium hydrogenphosphate or phosphoric acid. The compositions of rare earth phosphates were determined by XRD, FT-IR, and TG–DTA. Catalytic properties were studied as one of properties of various rare earth phosphates. Specific surface areas of samples were measured by the BET method. Acid strengths and amounts of acidic sites were measured using several indicators by n-butylamine titration. Acidic properties were also confirmed by adsorption of ammonia. Various rare earth phosphates were characterized by catalytic activities on dehydration reaction of 2-propanol, cracking/dehydrogenation
reaction of cumene, and isomerization reaction of butene. The characterization of catalysts was discussed with regard to type of rare earth elements, type of phosphates, and type of phosphorus resources.
147 citations
TL;DR: This study reveals a generalized method for improving PLQYs in hybrid manganese bromides and is readily extended to designing all varieties of highly emissive hybrid materials.
Abstract: Hybrid manganese halides have attracted widespread attention because of their highly emissive optical properties. To understand the underlying structural factors that dictate the photoluminescence quantum yield (PLQY) of these materials, we report five new hybrid manganese bromides with the general formula AmMnBr4 [m = 1 or 2, A = dimethylammonium (DMA), 3-methylpiperidinium (3MP), 3-aminomethylpiperidinium (3AMP), heptamethylenimine (HEP), and trimethylphenylammonium (TMPEA)]. By studying the crystal structures and optical properties of these materials and combining our results with the findings from previously reported analogs, we have found a direct correlation between Mn···Mn distance and the PLQY, where high PLQYs are associated with long Mn···Mn distances. This effect can be viewed as a manifestation of the concentration-quenching effect, except these are in stoichiometric compounds with precise interatomic distances rather than random alloys. To gain better separation of the Mn centers and prevent energy transfer, a bulky singly protonated cation that avoids H-bonding is ideal. We have demonstrated this principle in one of our newly reported material, (TMPEA)2MnBr4, where a PLQY of 70.8% for a powder sample and 98% for a large single crystal sample is achieved. Our study reveals a generalized method for improving PLQYs in hybrid manganese bromides and is readily extended to designing all varieties of highly emissive hybrid materials.
123 citations