NaYP2O7

Hamady, Aliou; Jouini, Tahar

doi:10.1107/s0108270196009626

Cited by 22 publications

(18 citation statements)

References 5 publications

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“…In the eight hosts, Y 3+ /Lu 3+ ions stay in the center of slightly distorted octahedra and only occupy one crystallographic site that has site symmetry of C 2h for a-KYP 2 O 7 and C 1 for other seven hosts [9][10][11][12]. Consequently, crystal field can fully split Ce 3+ 5d level into three low-lying t-type levels (5d(1), 5d(2) and 5d (3)) and two high-lying e-type levels (5d(4) and 5d (5)).…”

Section: Ce 3+ -Doped Arep 2 Omentioning

confidence: 99%

“…For small RE 3+ ions such as Y 3+ and Lu 3+ , RbREP 2 O 7 and CsREP 2 O 7 exhibit the KAlP 2 O 7 structure (S.G. P2 1 /c, Z ¼ 4) [9], whereas NaLuP 2 O 7 is isostructural with NaYP 2 O 7 (P2 1 , Z ¼ 2) [10]. As for KYP 2 The powder X-ray diffraction (XRD) data for phase identification was collected at ambient temperature with a Rigaku D/max2500 diffractometer (Cu Ka radiation, 40 kV/200 mA).…”

Section: Introductionmentioning

confidence: 99%

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VUV spectroscopic properties of Ce3+ and Pr3+-doped AREP2O7-type alkali rare earth diphosphates (A=Na, K, Rb, Cs; RE=Y, Lu)

Yuan

Wang

Xiong

et al. 2007

Journal of Luminescence

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Section: Ce 3+ -Doped Arep 2 Omentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

VUV spectroscopic properties of Ce3+ and Pr3+-doped AREP2O7-type alkali rare earth diphosphates (A=Na, K, Rb, Cs; RE=Y, Lu)

Yuan

Wang

Xiong

et al. 2007

Journal of Luminescence

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“…A fifth type occurs for the KYP 2 O 7 structure [15]. The sixth type concerned NaYP 2 O 7 , reveals a new structure arrangement [16]. The last type is represented by NaDyP 2 O 7 [17].…”

Section: Introductionmentioning

confidence: 99%

Infra-red, NMR Spectroscopy and Transport Properties of Diphosphate NaAlP2O7

et al. 2014

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The sodium aluminum diphosphate compound has been synthesized by the classic ceramic method and characterized by X-ray diffraction technique, IR, 31 P NMR, 23 Na NMR and impedance spectroscopy. It crystallizes in monoclinic space group P2 1/c . The MAS-NMR spectra showed two and one isotropic resonances relatives to 31 P and 23 Na, respectively, revealing the existence of two phosphorus and one sodium environments in the structure. The electrical properties of this compound have been measured in the temperature range from 523 to 673 K and the frequency range from 209 Hz to 5 MHz. The Nyquist plots are fitted to an equivalent circuit modeled by a combination series of two parallel (R//C) and (R//CPE). Impedance measurements show NaAlP 2 O 7 an ionic conductor being the conductivity 1.16 9 10 -5 Xcm -1 at 613 K and E a is 0.95 eV. The conductivity provide nearly the same activation energies for electrical relaxation of mobile ions revealing that transport properties in this material appear to be due to an ionic hopping mechanism dominated by the motion of the Na ? ions along [101] tunnels direction presented in the structure of the investigated material. The peak positions x p of M 00 spectra shift toward higher frequencies with increase in temperature.

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“…Chukova et al [14] reported the possibility of incorporation of the f-elements impurities rare-earth elements (Dy, Sm, Nd) into NASICON matrix of the phosphates. Traditionally, rare-earths doped phosphate phosphors with general formulas such as MLnP 2 O 7 [15], M 3 Ln(PO 4 ) 2 [16], and MLn(PO 3 ) 4 [17] (M, alkali metal; Ln, rare-earth metal) were prepared by the solid state reaction method, which demands longer reaction times and higher annealing temperatures. Today, low temperature methods such as hydrothermal microwave [18], co-precipitation [19,20], sol-gel [21,22] and combustion [23] are used to prepare these phosphors.…”

Section: Introductionmentioning

confidence: 99%