Alveolar sheet of polycarbonate comprising a first outer wall (2) and a second outer wall (3) jointed together by equidistant perpendicular baffles (4).
At least one of said two outer wall (2.3) and said perpendicular baffles (4) comprise a layer of polycarbonate to which an U.V. light neutralizing substance is added.
A series of Ca 10 K(PO 4 ) 7 :Eu 2+ , Mn 2+ (CKP:Eu 2+ , Mn 2+ ) phosphors was synthesized by solid-state reaction. Under an optimal excitation of 347 nm, we have observed a blue emission band at 467 nm and a red emission band at 634 nm, which resulted from Eu 2+ and Mn 2+ , respectively. The energy transfer from Eu 2+ to Mn 2+ in CKP host matrix is of a resonant type via a dipolequadrupole mechanism
Equations of State and Crystal Structures of KCaPO<sub>4</sub>, KSrPO<sub>4</sub>, and K<sub>2</sub>Ce(PO<sub>4</sub>)<sub>2</sub> under High Pressure: Discovery of a New Polymorph of KCaPO<sub>4</sub>
作者:Daniel Errandonea、Srungarpu N. Achary、Daniel Diaz-Anichtchenko、Enrico Bandiello、Tomas Marqueño、Rakesh Shukla、Avesh K. Tyagi、Catalin Popescu、Frederico G. Alabarse
DOI:10.1021/acs.cgd.2c01547
日期:——
and K2Ce(PO4)2 underhighpressure up to 26, 25, and 22 GPa, respectively. For KCaPO4, we have also accurately determined the crystal structure under ambient conditions, which differs from the structure previously reported. Arguments supporting our structural determination will be discussed. We have found that KCaPO4 undergoes a reversible phase transition. The onset of the transition is at 5.6 GPa
Investigations on the luminescence of emission-tunable Ca<sub>10</sub>K(PO<sub>4</sub>)<sub>7</sub>:Eu<sup>2+</sup>, Sr<sup>2+</sup>, Mg<sup>2+</sup> phosphors for white LEDs
Etude thermolytique et polymorphique des composes KCaPO4 · H2O ET K4Ca(PO4)2 · 5H2O
作者:R. Rokbani、N. Kbir-Ariguib
DOI:10.1016/0040-6031(90)80109-c
日期:1990.1
Abstract KCaPO4· H2O and K4Ca(PO4)2·5H2O have been studied using thermogravimetric and differential thermalanalysis. X-ray and IR patterns of the pentahydrate and its anhydrous form are given. The dehydration of KCaPO4· H2O occurs in one step. The anhydrous KCaPO4 exhibits a polymorphic transformation. Dehydration of K4Ca(PO4)2· 5H2O occurs in five steps giving four hydrated salts containing 3, 2