OD (order-disorder) character of the crystal structure of godlevskite Ni9S8

Stefano Merlino; Emil Makovicky

doi:10.1127/0935-1221/2009/0021-1961

OD (order-disorder) character of the crystal structure of godlevskite Ni₉S₈

Stefano Merlino, Emil Makovicky

Geology

1 Citation (Scopus)

Abstract

Godlevskite Ni₉S₈ has been found to be an OD (order-disorder)structure consisting of two kinds of OD layers in strict alternation;these layers display stacking disorder. They have layer symmetriesP( Formula

)2m and P2₁2(2), respectively(symmetry elements in parentheses are perpendicular to OD layers).Two structures with maximum degree of order (MDO polytypes),with space-group symmetries A222 and I4₁22, respectively, exist,together with more complex polytypes or disordered sequences.The OD character is in keeping with the frequent twinning ofgodlevskite.

Original language	English
Journal	European Journal of Mineralogy
Volume	21
Pages (from-to)	863-869
ISSN	0935-1221
DOIs	https://doi.org/10.1127/0935-1221/2009/0021-1961
Publication status	Published - 2009

Keywords

Faculty of Science
godlevskite
polytypes
OD structure
nickel arsenide

Access to Document

10.1127/0935-1221/2009/0021-1961

Cite this

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title = "OD (order-disorder) character of the crystal structure of godlevskite Ni9S8",

abstract = "Godlevskite Ni9S8 has been found to be an OD (order-disorder) structure consisting of two kinds of OD layers in strict alternation; these layers display stacking disorder. They have layer symmetries P()2m and P212(2), respectively (symmetry elements in parentheses are perpendicular to OD layers). Two structures with maximum degree of order (MDO polytypes), with space-group symmetries A222 and I4122, respectively, exist, together with more complex polytypes or disordered sequences. The OD character is in keeping with the frequent twinning of godlevskite. ",

keywords = "Faculty of Science, godlevskite, polytyper, orden-uorden strukturer, godlevskite, polytypes, OD structure, nickel arsenide",

author = "Stefano Merlino and Emil Makovicky",

year = "2009",

doi = "10.1127/0935-1221/2009/0021-1961",

language = "English",

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pages = "863--869",

journal = "European Journal of Mineralogy",

issn = "0935-1221",

publisher = "E.Schweizerbart'sche Verlagsbuchhandlung",

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TY - JOUR

T1 - OD (order-disorder) character of the crystal structure of godlevskite Ni9S8

AU - Merlino, Stefano

AU - Makovicky, Emil

PY - 2009

Y1 - 2009

N2 - Godlevskite Ni9S8 has been found to be an OD (order-disorder) structure consisting of two kinds of OD layers in strict alternation; these layers display stacking disorder. They have layer symmetries P()2m and P212(2), respectively (symmetry elements in parentheses are perpendicular to OD layers). Two structures with maximum degree of order (MDO polytypes), with space-group symmetries A222 and I4122, respectively, exist, together with more complex polytypes or disordered sequences. The OD character is in keeping with the frequent twinning of godlevskite.

AB - Godlevskite Ni9S8 has been found to be an OD (order-disorder) structure consisting of two kinds of OD layers in strict alternation; these layers display stacking disorder. They have layer symmetries P()2m and P212(2), respectively (symmetry elements in parentheses are perpendicular to OD layers). Two structures with maximum degree of order (MDO polytypes), with space-group symmetries A222 and I4122, respectively, exist, together with more complex polytypes or disordered sequences. The OD character is in keeping with the frequent twinning of godlevskite.

KW - Faculty of Science

KW - godlevskite

KW - polytyper

KW - orden-uorden strukturer

KW - godlevskite

KW - polytypes

KW - OD structure

KW - nickel arsenide

U2 - 10.1127/0935-1221/2009/0021-1961

DO - 10.1127/0935-1221/2009/0021-1961

M3 - Journal article

SN - 0935-1221

VL - 21

SP - 863

EP - 869

JO - European Journal of Mineralogy

JF - European Journal of Mineralogy

ER -