Ordering of Al and Si on :tetra:M!ttal ùodes' .of framework struetures h:as' been studied extensively, particulàrly in feldspars {Smith, 1974) and zeolite molecular sieves (Breck, 1974; Rabo, 197.6; rnany recent papets), Alternation of Al ::tl}d ~over tètrabedral nedes was found. for the nfth.member of' ~ Ìl~W s,er'ie$qf AIPO~ molecular. sieves fSennett, Coheof Flanigen, Pluth & ;8tì).jth, 1983). Wf; now return te the problem of ordering of Al, p and Si in the aluminosilicophosphate zeolites synthssized by Flanigen & GTQS,e.(197.1). Xsray datawerecollestedin 19~5 oy r..», 8~r1e~ç. R. KIiQ;wLes1 t V" Smirh and L.. G. Dowell for an ,80 '!J.Il1 cube qfzeolit,eP-C depicted in plate 1 ai Flanìgen & Grose (ì971) andsatisfaétory refìnement was obtained for an average structnrè. of analcime tYJl~ with spa,ce group fa'3d, Alrernation of (7P + 118i) and (23M + ~Si) over the tetrahedral sites was considered, but the Xvray data were inadequate for il, valid, test, We J;lOw, report .a structural refìnement ,ofa trapezohedron of'zeoìité P-C (Flanigen &.. Grose, 1911) in space group [413'2 whieh allows ordering between (Si,P)and Al over adjacent tetrahedralnodes. Refìnements of the erystal structnre of analcime minerals were made: by Cilled & Ferraris. (1964)/ Rtiowles,RiQal,di &. Sm1th (19~5) and Perraris, Jones & Yerkess (1972} Optical ànd X-rllY anornalies were reported by Coornbs (i955), and Mazzi &. Galli (1-978), showed that tetragonal and orthorhombic. varieties resùlted from pàrtial Sì,AI order over. the tetrahedral sites. Th~ idea], tòpologica] sYl1lmetry of. analcime is nubic (la,3d), and a revìew of J(:hOwn phasés related. fa analcime or leucite is given by Galli, Gottardi &:. Mazz] (1978).

Synthetic phosphorus-substituted analcime, with ordered aluminum and silicon/phosphorus

ARTIOLI, GILBERTO;
1984

Abstract

Ordering of Al and Si on :tetra:M!ttal ùodes' .of framework struetures h:as' been studied extensively, particulàrly in feldspars {Smith, 1974) and zeolite molecular sieves (Breck, 1974; Rabo, 197.6; rnany recent papets), Alternation of Al ::tl}d ~over tètrabedral nedes was found. for the nfth.member of' ~ Ìl~W s,er'ie$qf AIPO~ molecular. sieves fSennett, Coheof Flanigen, Pluth & ;8tì).jth, 1983). Wf; now return te the problem of ordering of Al, p and Si in the aluminosilicophosphate zeolites synthssized by Flanigen & GTQS,e.(197.1). Xsray datawerecollestedin 19~5 oy r..», 8~r1e~ç. R. KIiQ;wLes1 t V" Smirh and L.. G. Dowell for an ,80 '!J.Il1 cube qfzeolit,eP-C depicted in plate 1 ai Flanìgen & Grose (ì971) andsatisfaétory refìnement was obtained for an average structnrè. of analcime tYJl~ with spa,ce group fa'3d, Alrernation of (7P + 118i) and (23M + ~Si) over the tetrahedral sites was considered, but the Xvray data were inadequate for il, valid, test, We J;lOw, report .a structural refìnement ,ofa trapezohedron of'zeoìité P-C (Flanigen &.. Grose, 1911) in space group [413'2 whieh allows ordering between (Si,P)and Al over adjacent tetrahedralnodes. Refìnements of the erystal structnre of analcime minerals were made: by Cilled & Ferraris. (1964)/ Rtiowles,RiQal,di &. Sm1th (19~5) and Perraris, Jones & Yerkess (1972} Optical ànd X-rllY anornalies were reported by Coornbs (i955), and Mazzi &. Galli (1-978), showed that tetragonal and orthorhombic. varieties resùlted from pàrtial Sì,AI order over. the tetrahedral sites. Th~ idea], tòpologica] sYl1lmetry of. analcime is nubic (la,3d), and a revìew of J(:hOwn phasés related. fa analcime or leucite is given by Galli, Gottardi &:. Mazz] (1978).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2496411
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