Crystal Structure of an Ammonium Nickel Molybdate Prepared by Chemical Precipitation

Doron Levin; Stuart L. Soled; Jackie Y. Ying

doi:10.1021/ic951200s

Crystal Structure of an Ammonium Nickel Molybdate Prepared by Chemical Precipitation

Doron Levin
, Stuart L. Soled
, Jackie Y. Ying^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

74 Scopus citations

Abstract

A layered ammonium nickel molybdate was prepared by precipitation from a solution of nickel nitrate and ammonium heptamolybdate. The compound obtained, (NH₄)HNi₂(OH)₂(MoO₄)₂, is trigonal with hexagonal unit cell parameters a = 6.0147(4) Å, c = 21.8812(13) Å, and Z = 3. A powder X-ray diffraction pattern was obtained using synchrotron radiation. The structure was generated from three-dimensional Patterson and difference Fourier density maps and refined in the space group R3̄m by the Rietveld method. The structure consists of molybdate tetrahedra and nickel octahedra forming layers perpendicular to the c axis. There are three layers per unit cell, with ammonium ions incorporated between the layers. The structure is a member of a solid solution series of (NH₄)H_2xNi_3-xO(OH)(MoO₄) ₂, where 0 ≤ x ≤ 3/2. The nonstoichiometry arises from variable occupancy of the nickel position and allows for the formation of these compounds having Ni/Mo ratios varying from 0.75 to 1.5.

Original language	English
Pages (from-to)	4191-4197
Number of pages	7
Journal	Inorganic Chemistry
Volume	35
Issue number	14
DOIs	https://doi.org/10.1021/ic951200s
State	Published - 1996
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Inorganic Chemistry

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@article{865a9289c5b14dbabc38c4908cfaae76,

title = "Crystal Structure of an Ammonium Nickel Molybdate Prepared by Chemical Precipitation",

abstract = "A layered ammonium nickel molybdate was prepared by precipitation from a solution of nickel nitrate and ammonium heptamolybdate. The compound obtained, (NH4)HNi2(OH)2(MoO4)2, is trigonal with hexagonal unit cell parameters a = 6.0147(4) {\AA}, c = 21.8812(13) {\AA}, and Z = 3. A powder X-ray diffraction pattern was obtained using synchrotron radiation. The structure was generated from three-dimensional Patterson and difference Fourier density maps and refined in the space group R{\=3}m by the Rietveld method. The structure consists of molybdate tetrahedra and nickel octahedra forming layers perpendicular to the c axis. There are three layers per unit cell, with ammonium ions incorporated between the layers. The structure is a member of a solid solution series of (NH4)H2xNi3-xO(OH)(MoO4) 2, where 0 ≤ x ≤ 3/2. The nonstoichiometry arises from variable occupancy of the nickel position and allows for the formation of these compounds having Ni/Mo ratios varying from 0.75 to 1.5.",

author = "Doron Levin and Soled, \{Stuart L.\} and Ying, \{Jackie Y.\}",

year = "1996",

doi = "10.1021/ic951200s",

language = "English",

volume = "35",

pages = "4191--4197",

journal = "Inorganic Chemistry",

issn = "0020-1669",

publisher = "American Chemical Society",

number = "14",

}

TY - JOUR

T1 - Crystal Structure of an Ammonium Nickel Molybdate Prepared by Chemical Precipitation

AU - Levin, Doron

AU - Soled, Stuart L.

AU - Ying, Jackie Y.

PY - 1996

Y1 - 1996

N2 - A layered ammonium nickel molybdate was prepared by precipitation from a solution of nickel nitrate and ammonium heptamolybdate. The compound obtained, (NH4)HNi2(OH)2(MoO4)2, is trigonal with hexagonal unit cell parameters a = 6.0147(4) Å, c = 21.8812(13) Å, and Z = 3. A powder X-ray diffraction pattern was obtained using synchrotron radiation. The structure was generated from three-dimensional Patterson and difference Fourier density maps and refined in the space group R3̄m by the Rietveld method. The structure consists of molybdate tetrahedra and nickel octahedra forming layers perpendicular to the c axis. There are three layers per unit cell, with ammonium ions incorporated between the layers. The structure is a member of a solid solution series of (NH4)H2xNi3-xO(OH)(MoO4) 2, where 0 ≤ x ≤ 3/2. The nonstoichiometry arises from variable occupancy of the nickel position and allows for the formation of these compounds having Ni/Mo ratios varying from 0.75 to 1.5.

AB - A layered ammonium nickel molybdate was prepared by precipitation from a solution of nickel nitrate and ammonium heptamolybdate. The compound obtained, (NH4)HNi2(OH)2(MoO4)2, is trigonal with hexagonal unit cell parameters a = 6.0147(4) Å, c = 21.8812(13) Å, and Z = 3. A powder X-ray diffraction pattern was obtained using synchrotron radiation. The structure was generated from three-dimensional Patterson and difference Fourier density maps and refined in the space group R3̄m by the Rietveld method. The structure consists of molybdate tetrahedra and nickel octahedra forming layers perpendicular to the c axis. There are three layers per unit cell, with ammonium ions incorporated between the layers. The structure is a member of a solid solution series of (NH4)H2xNi3-xO(OH)(MoO4) 2, where 0 ≤ x ≤ 3/2. The nonstoichiometry arises from variable occupancy of the nickel position and allows for the formation of these compounds having Ni/Mo ratios varying from 0.75 to 1.5.

UR - https://www.scopus.com/pages/publications/0001641137

U2 - 10.1021/ic951200s

DO - 10.1021/ic951200s

M3 - Article

AN - SCOPUS:0001641137

SN - 0020-1669

VL - 35

SP - 4191

EP - 4197

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 14

ER -

Crystal Structure of an Ammonium Nickel Molybdate Prepared by Chemical Precipitation

Abstract

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