Crystal Chemistry and Polymorphism of Potassium–Magnesium Monophosphate

Wallez, Gilles; Colbeau‐Justin, Christophe; Mercier, Thierry Le; Quarton, M.; Robert, Françis

doi:10.1006/jssc.1997.7671

Cited by 41 publications

(25 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Site Mg1 is [4+1]-coordinated, with four short Mg1-O distances [1.934 (3)-1.991 (3) Å ] and a fifth longer distance of 2.588 (3) Å . The average value of 1.963 (3) Å calculated from the four short distances is consistent with 1.93 (2) Å reported for the tetrahedral Mg 2+ cation in KMgPO 4 (Wallez et al, 1998). Sites Mg2-Mg6 are five-coordinated, with Mg-O distances in the range 1.915 (6)-2.143 (3) Å .…”

Section: Commentsupporting

confidence: 86%

Structure and³¹P NMR spectroscopy of a new phosphate, Na₈Ca_1.5Mg_12.5(PO₄)₁₂

et al. 2011

View full text Add to dashboard Cite

A new phosphate, sodium calcium magnesium tetrakis(phosphate), Na(8)Ca(1.5)Mg(12.5)(PO(4))(12), has been synthesized by a flux method. Its novel structure consists of MgO(x) (x = 5 and 6) polyhedra and MO(7) (M = Mg or Na) octahedra linked directly through common corners or edges to form a rigid three-dimensional skeleton, reinforced by corner-sharing between identical Mg(12)MO(48) units. The connection of these units by the PO(4) tetrahedra induces cavities and crossing tunnels where the Na(+) and Ca(2+) cations are located. This structural model was supported by a (31)P NMR spectroscopy study which confirmed the existence of 12 crystallographically independent sites for the P atoms.

show abstract

Section: Commentsupporting

confidence: 86%

Structure and³¹P NMR spectroscopy of a new phosphate, Na₈Ca_1.5Mg_12.5(PO₄)₁₂

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Thus, this environment can be considered as [4 + 1]. The average value of 2.005 (10) Å calculated from the four short distances is slightly higher but consistent with that of 1.930 (2) Å reported for the tetracoordinated Mg 2+ cation in KMgPO 4 (Wallez et al,1998). Sites Mg2 and Mg3 are located on twofold rotation axes and have slightly distorted octahedral environments with Mg-O distances varying from 2.052 (3) to 2.202 (2) Å for Mg2 and from 2.042 (2) to 2.169 (2) Å for Mg3.…”

Section: Structural Commentarysupporting

confidence: 85%

Synthesis and crystal structure of a new magnesium phosphate Na₃RbMg₇(PO₄)₆

Hamed

Boukhris

Badri

et al. 2017

Acta Crystallogr E Cryst Commun

View full text Add to dashboard Cite

Trisodium rubidium heptamagnesium hexakis(orthophosphate) exhibits a new structure type, with MgOx (x = 5 and 6) polyhedra linked directly to each other through common corners or edges and reinforced by corner-sharing with PO4 tetrahedra. The resulting anionic three-dimensional framework leads to the formation of channels in which the Na+ cations are located, while the Rb+ cations are located in large interstitial cavities.

show abstract

“…In maricite, cobalt and manganese ions are iso morphously substituted for iron [7][8][9][10][11][12]. Lithium con taining LiE II PO 4 phosphates (E II = Mg, Ni, Co, Fe, Mn, Cd) have an olivine structure related to maricite, and potassium containing KE II PO 4 compounds (E II = Be, Ni, Mg, Cu, Co, Zn) have a β tridymite structure [13][14][15][16][17].Among the studied NaE II PO 4 phosphates, nickel containing compounds with a maricite structure are absent. At the same time, contradictory data have been reported for the NaNiPO 4 and Na 4 Ni 7 (PO 4 ) 6 (space group Cm) phases [18,19].…”

mentioning

confidence: 99%

Synthesis of sodium nickel phosphate and its crystallographic, spectroscopic, and temperature-controlled X-ray diffraction study

Korchemkin

Pet’kov

Kurazhkovskaya

et al. 2015

Russ. J. Inorg. Chem.

View full text Add to dashboard Cite

Phosphates A I E II PO 4 , where A I and E II are ele ments in oxidation states +1 and +2, include repre sentatives of different structure types: β tridymite, arcanite, glaserite, olivine, maricite, etc. [1][2][3][4].Compounds with the structure of the mineral mar icite, NaFe 0.90 Mn 0.06 Mg 0.03 Co 0.01 PO 4 , attract the attention of experts by the possibility of using them as electrodes of sodium ion cells antiferromagnets, and materials with nonlinear optical activity (caused by the similarity of the structures of maricite and potassium titanyl phosphate) [5][6][7][8]. A synthetic analogue of mar icite is NaFePO 4 (space group Pnma, Z = 4) [4]. In the polyhedral form, the crystal structure can be represented by columns of edge sharing FeO 6 octahedra extended along the b axis and linked with each other through PO 4 tetrahedra. The cavities in the structures accommodate Na + ions. The crystal chemical formula of maricite type compounds is (M1) [6 + 4] {(M2) [6] (TO 4 )} 3∞ , where {(M2) [6] (TO 4 )} 3∞ is the octahedral-tetrahedral frame work of the structure, M1 is an extraframework posi tion. In maricite, cobalt and manganese ions are iso morphously substituted for iron [7][8][9][10][11][12]. Lithium con taining LiE II PO 4 phosphates (E II = Mg, Ni, Co, Fe, Mn, Cd) have an olivine structure related to maricite, and potassium containing KE II PO 4 compounds (E II = Be, Ni, Mg, Cu, Co, Zn) have a β tridymite structure [13][14][15][16][17].Among the studied NaE II PO 4 phosphates, nickel containing compounds with a maricite structure are absent. At the same time, contradictory data have been reported for the NaNiPO 4 and Na 4 Ni 7 (PO 4 ) 6 (space group Cm) phases [18,19]. The latter has the X ray diffraction pattern similar to that of NaNiPO 4 . Because of the close ionic radii of nickel and cobalt, the possible polymorphism of the nickel containing phosphate is of interest, since three polymorphs, in addition to maricite, are known for isostoichiometric NaCoPO 4 [8][9][10][11].The aim of this study is to synthesize sodium nickel phosphate NaNiPO 4 , refine its structure, and study its thermal behavior and thermal expansion. EXPERIMENTALThe initial reagents for the synthesis of NaNiPO 4 were chemically pure NaNO 3 , Ni(CH 3 COO) 2 ⋅ 4H 2 O, and H 3 PO 4 . Stoichiometric amounts of 1 M aqueous solutions of the metal salts were poured together under continuous stirring at room temperature, and then a solution of orthophosphoric acid containing a stoichi ometric amount of phosphate ion was added. The reaction mixture was dried at 80°С, the powder was ground in an agate mortar, and heat treated in air at 600°С for 24 h. To study the thermal behavior of the sample, it was subjected to stepwise annealing at tem peratures 700-1000°С. After each stage of heating, the sample was ground.The chemical composition and homogeneity of the sodium nickel phosphate sample was monitored by a JEOL JSM 7600F scanning electron microscope with a thermal field emission gun (Schottky cathode) equipped with an OXFORD X Max 80 (Premiu...

show abstract

Crystal Chemistry and Polymorphism of Potassium–Magnesium Monophosphate

Cited by 41 publications

References 11 publications

Structure and³¹P NMR spectroscopy of a new phosphate, Na₈Ca_1.5Mg_12.5(PO₄)₁₂

Structure and³¹P NMR spectroscopy of a new phosphate, Na₈Ca_1.5Mg_12.5(PO₄)₁₂

Synthesis and crystal structure of a new magnesium phosphate Na₃RbMg₇(PO₄)₆

Synthesis of sodium nickel phosphate and its crystallographic, spectroscopic, and temperature-controlled X-ray diffraction study

Contact Info

Product

Resources

About

Crystal Chemistry and Polymorphism of Potassium–Magnesium Monophosphate

Cited by 41 publications

References 11 publications

Structure and31P NMR spectroscopy of a new phosphate, Na8Ca1.5Mg12.5(PO4)12

Structure and31P NMR spectroscopy of a new phosphate, Na8Ca1.5Mg12.5(PO4)12

Synthesis and crystal structure of a new magnesium phosphate Na3RbMg7(PO4)6

Synthesis of sodium nickel phosphate and its crystallographic, spectroscopic, and temperature-controlled X-ray diffraction study

Contact Info

Product

Resources

About

Structure and³¹P NMR spectroscopy of a new phosphate, Na₈Ca_1.5Mg_12.5(PO₄)₁₂

Structure and³¹P NMR spectroscopy of a new phosphate, Na₈Ca_1.5Mg_12.5(PO₄)₁₂

Synthesis and crystal structure of a new magnesium phosphate Na₃RbMg₇(PO₄)₆