Properties and structure of lanthanum phosphate glasses

2000 ◽  
Author(s):  
Richard K. Brow ◽  
Ezz Metwalli ◽  
David L. Sidebottom
Keyword(s):  
Phosphate Glasses ◽  
Lanthanum Phosphate

Phosphate content influence on structural, spectroscopic, and lasing properties of Er,Yb-doped potassium-lanthanum phosphate glasses

2016 ◽  
Vol 55 (4) ◽  
pp. 047102 ◽  
Author(s):  
Jan Šulc ◽  
Richard Švejkar ◽  
Helena Jelínková ◽  
Karel Nejezchleb ◽  
Karel Nitsch ◽  
...  
Keyword(s):  
Phosphate Glasses ◽  
Phosphate Content ◽  
Lanthanum Phosphate

High-energy X-ray diffraction study of La co-ordination in lanthanum phosphate glasses

2002 ◽  
Vol 297 (2-3) ◽  
pp. 263-274 ◽  
Author(s):  
Uwe Hoppe ◽  
EzzEldin Metwalli ◽  
Richard K Brow ◽  
Jörg Neuefeind
Keyword(s):  
Diffraction Study ◽  
High Energy ◽  
Phosphate Glasses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lanthanum Phosphate

Phase separation and crystallization in sodium lanthanum phosphate glasses induced by electrochemical substitution of sodium ions with protons

2015 ◽  
Vol 17 (35) ◽  
pp. 22855-22861 ◽  
Author(s):  
Keiga Kawaguchi ◽  
Takuya Yamaguchi ◽  
Takahisa Omata ◽  
Toshiharu Yamashita ◽  
Hiroshi Kawazoe ◽  
...  
Keyword(s):  
Phase Separation ◽  
Proton Conductivity ◽  
Phosphate Glasses ◽  
Sodium Ions ◽  
Lanthanum Phosphate ◽  
Significant Proton

Phase separation and crystallization forming H3PO4 occurred in sodium lanthanum phosphate glasses after electrochemical substitution of sodium ions with protons, although the glass exhibited significant proton conductivity.

Solid-state nuclear magnetic resonance study of the structure of lanthanum phosphate crystals and glasses

2000 ◽  
Vol 15 (11) ◽  
pp. 2463-2467 ◽  
Author(s):  
Nancy E. Rashid ◽  
Brian L. Phillips ◽  
Subhash H. Risbud
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
Chemical Shifts ◽  
Nuclear Magnetic Resonance Study ◽  
Phosphate Glasses ◽  
Resonance Spectroscopy ◽  
X Ray Diffraction ◽  
Lanthanum Phosphate ◽  
Nuclear Magnetic

Lanthanum phosphate glasses were synthesized by melt quenching and characterized by x-ray diffraction, electron microprobe analysis, and solid-state nuclear magnetic resonance spectroscopy. A range of compositions near the metaphosphate composition (75 mol% P2O5) was examined. Comparison of 31P chemical shifts and shielding anisotropies of glasses with those of the crystalline phases of La(PO3)3 (metaphosphate) and LaP5O14 (pentaphosphate) were consistent with the presence of primarily chainlike Q2 phosphate groups.

scholarly journals PREPARATION OF ALUMINUM LANTHANUM PHOSPHATE GLASSES CONTAINING LARGE QUANTITY OF MOLECULAR WATER

2005 ◽  
Vol 19 (0) ◽  
pp. 284-287
Author(s):  
KOUSUKE UOE ◽  
TOSHIYUKI MIYAUCHI ◽  
HIDEHIKO MORI ◽  
MAKOTO WATANABE ◽  
YOSHIHIRO ABE
Keyword(s):  
Phosphate Glasses ◽  
Molecular Water ◽  
Lanthanum Phosphate

scholarly journals SOLID STATE NMR SPECTROSCOPY OF LANTHANUM PHOSPHATE GLASSES

1999 ◽  
Vol 10 (0) ◽  
pp. 527-533
Author(s):  
NANCY E. MYERS ◽  
BRIAN L. PHILLIPS ◽  
SUBHASH H. RISBUD
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Phosphate Glasses ◽  
Solid State Nmr Spectroscopy ◽  
Lanthanum Phosphate

High resolution electron microscopy of lanthanum phosphate crystals

1978 ◽  
Vol 36 (1) ◽  
pp. 274-275
Author(s):  
J. C. Wheatley ◽  
J. M. Cowley
Keyword(s):  
Electron Microscopy ◽  
Catalytic Activity ◽  
High Resolution ◽  
Petroleum Industry ◽  
High Resolution Electron Microscopy ◽  
Lanthanum Phosphate ◽  
Good Catalyst ◽  
Resolution Electron ◽  
Good Catalytic Activity ◽  
Physical And Chemical

Rare-earth phosphates are of particular interest because of their catalytic properties associated with the hydrolysis of many aromatic chlorides in the petroleum industry. Lanthanum phosphates (LaPO4) which have been doped with small amounts of copper have shown increased catalytic activity (1). However the physical and chemical characteristics of the samples leading to good catalytic activity are not known.Many catalysts are amorphous and thus do not easily lend themselves to methods of investigation which would include electron microscopy. However, the LaPO4, crystals are quite suitable samples for high resolution techniques.The samples used were obtained from William L. Kehl of Gulf Research and Development Company. The electron microscopy was carried out on a JEOL JEM-100B which had been modified for high resolution microscopy (2). Standard high resolution techniques were employed. Three different sample types were observed: 669A-1-5-7 (poor catalyst), H-L-2 (good catalyst) and 27-011 (good catalyst).

Structure and dynamics of phosphate glasses

1998 ◽  
Vol 77 (2) ◽  
pp. 357-362 ◽  
Author(s):  
A. Matic, L. Borjesson
Keyword(s):  
Phosphate Glasses ◽  
Structure And Dynamics
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