Inorganic Solid Phases

NH4H2PO4 paraelectric (H2[NH4][PO4] rt, T = 158 K) Crystal Structure

General Information

  • Phase Label(s): H2[NH4][PO4] rt
  • Structure Class(es):
  • Classification by Properties: antiferroelectric AFE, ferroelectric FE, nonmetal
  • Mineral Name(s): biphosphammite
  • Pearson Symbol: tI24
  • Space Group: 122
  • Phase Prototype: H2K[PO4]
  • Measurement Detail(s): automatic diffractometer (determination of cell parameters), automatic diffractometer; France, Saclay, Laboratoire Léon Brillouin LLB, ORPHEE reactor, 5C2 (determination of structural parameters), neutrons; λ = 0.08308 nm (determination of cell and structural parameters), T = 158 K (determination of cell and structural parameters)
  • Phase Class(es):
  • Compound Class(es): orthophosphate
  • Interpretation Detail(s): complete structure determined, full-matrix least-squares refinement; 338 reflections; I > 3σ(I), R = 0.0354; wR = 0.0363
  • Sample Detail(s): single crystal (determination of cell parameters), single crystal, 2.5×4×5 mm3 (determination of structural parameters)

Substance Summary

  • Standard Formula: H2[NH4][PO4]
  • Alphabetic Formula: H2[NH4][PO4]
  • Published Formula: NH4H2PO4 paraelectric
  • Refined Formula: H6NO4P
  • Wyckoff Sequence: 122,eba
  • Z Formula Units: 4
  • Density: ρ = 1.82 Mg·m−3

Crystallographic Data

Cell Parameters

Published Data
Standardized Data
Unit Cell
Niggli-Reduced Cell
Space Group
a
b
c
α
β
γ
a/b
b/c
c/a
V

Atom Coordinates

Standardized

Site
Element
Wyckoff Symbol
Symmetry
X
Y
Z
Occupation
Co-ord. No.
Atomic Env.

Published

Site
Element
Wyckoff Symbol
Symmetry
X
Y
Z
Occupation

Displacement Parameters

Anisotropic

Site
U11 [nm2]
U22 [nm2]
U33 [nm2]
U12 [nm2]
U13 [nm2]
U23 [nm2]

Experimental Details

Reference

3D Interactive Structure

About this content

  • Database name

    PAULING FILE Multinaries Edition – 2012

  • Dataset ID

    sd_1827432

  • Copyright

    ©Springer & Material Phases Data System (MPDS), Switzerland & National Institute for Materials Science (NIMS), Japan, 2016

  • Chief Editor

    Pierre Villars, Material Phases Data System (MPDS), CH-6354 Vitznau, Switzerland

    villars.mpds@bluewin.ch

  • Credits

    SpringerMaterials Release 2016.

    Data generated pre-2002: © Springer & MPDS & NIMS; post-2001: © Springer & MPDS

    All Rights Reserved. Version 2016.10.

    Project Coordinator: Shuichi Iwata

    Section-Editor: Karin Cenzual (Crystal Structures)

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