The cation distribution between five- and six-coordinated sites in some (Mg,)3(PO4)2) solid solutions

Nord, Anders G.; Stefanidis, T.

doi:10.1016/0025-5408(80)90084-7

Cited by 28 publications

(7 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The patterns of the Mg 3−x Cu x (PO 4 ) 2 solid solutions, in which the value of x was varied over a range of 1-1.5, exhibit a strong resemblance to the pattern of Mg 3 (PO 4 ) 2 , and the pattern for x ‫ס‬ 2 shows a mixture of two phases. These patterns are all quite analogous to their cobalt-containing coun-terparts 2 and agree very well with the results reported by Moqine et al 4 Because of our interest in using Mg 2 Cu(PO 4 ) 2 to synthesize Cu + Cu 2+ Mg 3 (PO 4 ) 3 (see reaction (9) below), the former has been prepared by means of reactions (3)- (5). All three reactions yield pure Mg 2 Cu(PO 4 ) 2 .…”

Section: (1) Synthesis Of Solid Solutions Of Magnesium/copper Pyrophosupporting

confidence: 87%

Study of Phase Relationships within the MgO‐CuO‐Cu2O‐P2O5 System

Bamberger

1998

Journal of the American Ceramic Society

View full text Add to dashboard Cite

The formation of the known compound Cu + Cu 2+ Mg 3 (PO 4 ) 3 by alternate reactions and its thermal stability were studied. The formation of solid solutions of the types Mg 2−x Cu x P 2 O 7 and Mg 3−x Cu x (PO 4 ) 2 was reexamined, mainly to aid in the identification of the products of decomposition of Cu + Cu 2+ Mg 3 (PO 4 ) 3 . X-ray diffractometry patterns of Mg 2−x Cu x P 2 O 7 varied gradually in the range 0 ≤ x ≤ 2, which indicates complete miscibility.

show abstract

Section: (1) Synthesis Of Solid Solutions Of Magnesium/copper Pyrophosupporting

confidence: 87%

Study of Phase Relationships within the MgO‐CuO‐Cu2O‐P2O5 System

Bamberger

1998

Journal of the American Ceramic Society

View full text Add to dashboard Cite

show abstract

“…The ␦and ␥-phases seem to be the ones with the most-limited ranges of stability. 3 The existence of Cu + Cu 2+ PO 4 and Cu + Cu 2+ M 3 (PO 4 ) 3 , in which M ‫ס‬ Mg or Co, led us to attempt to synthesize Cu + ZnPO 4 and Cu + Cu 2+ Zn 3 (PO 4 ) 3 using reactions that were similar to those that were used previously with the other metal ions: 6,8,9 e.g., Zn 2 P 2 O 7 + Cu 2 O, 3Zn 2 P 2 O 7 + Cu 2 O + 2CuO, 2Zn 3 (PO 4 ) 2 + Cu 3 (PO 4 ) 2 + Cu 0 , and 2Zn 3 (PO 4 ) 2 + Cu 2 P 2 O 7 + Cu 2 O at 880°-1025°C. None of the reactions were successful in producing the desired compounds; instead, mixtures were obtained in which known Cu 2+ -and zinc-containing phases, together with Cu 0 and Cu 2 O, were predominant.…”

Section: (3) Solid Solutions Zn 3−x Co X (Po 4 )mentioning

confidence: 99%

Orthophosphates and Diphosphates Containing Zinc and Copper and Zinc and Cobalt

Bamberger

Specht

1998

Journal of the American Ceramic Society

View full text Add to dashboard Cite

Solid solutions of diphosphates of zinc and copper and of zinc and cobalt were synthesized from mixtures of pure diphosphates at temperatures up to 1000°C. Their X-ray diffractometry patterns varied continuously from one end member to the other. Solid solutions of orthophosphates of composition Zn 3−x Co x (PO 4 ) 2 , with x = 0.4-1.6, were formed at temperatures up to 950°C; all exhibited the structure of ␥-Zn 3 (PO 4 ) 2 . Solid solutions of orthophosphates of composition Zn 3−x Cu x (PO 4 ) 2 exhibited more-complex behavior. At 1000°C and copper contents of 20-80 mol%, a phase that is related to Cu 3 (PO 4 ) 2 , termed here the ''-phase,'' predominated. At 850°-950°C and in the region from 20 mol% to ∼33 mol% of copper, the solid solutions (the ''phase'') adopted the structure of graftonite. At 800°-900°C and 10-15 mol% of copper, the solid solutions exhibited a new structure (the ''␦-phase''), which we found to be related to the mineral sarcopside. At temperatures ≥950°C, the solutions that contained 5-15 mol% of copper (the ''␤phase'') had the structure of ␤-Zn 3 (PO 4 ) 2 , whereas at 800°-850°C, solutions with 5 mol% of copper (the ''␥phase'') exhibited the structure of ␥-Zn 3 (PO 4 ) 2 . Attempts to synthesize Cu + ZnPO 4 and Cu + Cu 2+ Zn 3 (PO 4 ) 3 were unsuccessful.

show abstract

“…_ 2 A/e z ) 3 (P0 4 ) 2 structure (Calvo, 1963), henceforward abbreviated "7", has been utilized to a large extent (e.g. Nord and Stefanidis, 1980a, 1980b, 1981Annersten, Ericsson, and Nord, 1980). This structure is isomorphous with the mineral farringtonite (DuFresne and Roy, 1961); it contains two distinct cationic environments: an almost regular octahedron, and a distorted trigonal bipyramid.…”

Section: Introductionmentioning

confidence: 98%

Cation distributions in (Fe₁ _-zMe_z)₃(PO₄)₂ graftonite-type solid solutions determined by Mössbauer spectroscopy

Nord¹,

Ericsson²

1982

Zeitschrift Für Kristallographie - Crystalline Materials

Self Cite

View full text Add to dashboard Cite

Solid solutions of Me 3 (P0 4 ) 2 in Fe 3 (P0 4 ) 2 , with the graftonitetype structure, have been prepared and equilibrated at 1070 Κ (Me = Mg, Ca, Co, Ni, Zn, or Cd). The (Fe! _ 2 Afe z ) 3 (P0 4 ) 2 phases are isomorphous with Fe 3 (P0 4 ) 2 as well as with the mineral graftonite. Accurate unit cell dimensions (P2 1 /c) have been obtained from Guinier-Hägg photographic data. The unit cell volume is strongly correlated with the amount and size of the incorporated Me 2 + cation. Mössbauer spectroscopy ( 57 Fe) has been used to determine the cation distribution of Fe 2 + and Me 2 + between the three distinct cationic environments in the structure : one octahedron and two fivecoordinated polyhedra, all distorted. The order of preference for five-over six-coordination may be given as Zn 2+ > Fe 2 + , Mg 2+ , Co 2+ , Ni 2+ > Ca 2+ > Mn 2+ > Cd 2 + .

show abstract

The cation distribution between five- and six-coordinated sites in some (Mg,)3(PO4)2) solid solutions

Cited by 28 publications

References 18 publications

Study of Phase Relationships within the MgO‐CuO‐Cu2O‐P2O5 System

Study of Phase Relationships within the MgO‐CuO‐Cu2O‐P2O5 System

Orthophosphates and Diphosphates Containing Zinc and Copper and Zinc and Cobalt

Cation distributions in (Fe₁ _-zMe_z)₃(PO₄)₂ graftonite-type solid solutions determined by Mössbauer spectroscopy

Contact Info

Product

Resources

About

The cation distribution between five- and six-coordinated sites in some (Mg,)3(PO4)2) solid solutions

Cited by 28 publications

References 18 publications

Study of Phase Relationships within the MgO‐CuO‐Cu2O‐P2O5 System

Study of Phase Relationships within the MgO‐CuO‐Cu2O‐P2O5 System

Orthophosphates and Diphosphates Containing Zinc and Copper and Zinc and Cobalt

Cation distributions in (Fe1 -zMez)3(PO4)2 graftonite-type solid solutions determined by Mössbauer spectroscopy

Contact Info

Product

Resources

About

Cation distributions in (Fe₁ _-zMe_z)₃(PO₄)₂ graftonite-type solid solutions determined by Mössbauer spectroscopy