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Verification of the de Wolff hypothesis concerning the symmetry of β‐MnO 2
Author(s) -
Fabrykiewicz Piotr,
Przeniosło Radosław,
Sosnowska Izabela,
Fauth François,
Oleszak Dariusz
Publication year - 2019
Publication title -
acta crystallographica section a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.742
H-Index - 83
ISSN - 2053-2733
DOI - 10.1107/s2053273319013408
Subject(s) - tetragonal crystal system , orthorhombic crystal system , superspace , condensed matter physics , rutile , symmetry (geometry) , formalism (music) , materials science , rotational symmetry , crystallography , diffraction , physics , crystal structure , chemistry , mathematical physics , mathematics , quantum mechanics , geometry , art , musical , visual arts , organic chemistry , supersymmetry , mechanics
The symmetry lowering from tetragonal to orthorhombic is demonstrated using high‐resolution diffraction and also justified by using the magnetic superspace groups formalism for the rutile‐type compound β‐MnO 2 . The (lower) orthorhombic symmetry is observed at temperatures both below and above the Néel temperature. The magnetic ordering of β‐MnO 2 is of spin density type and not screw‐type helical. The results support the de Wolff [ Acta Cryst. (1959), 12 , 341–345] hypothesis about the orthorhombic symmetry of β‐MnO 2 .