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Surface Relief Induced by Martensitic Transformation in Phosphorus‐Bearing Dicalcium Silicate
Author(s) -
Fukuda Koichiro,
Taguchi Hiroyuki,
Nomura Yasuteru,
Ota Toshitaka
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01521.x
Subject(s) - silicate , diffusionless transformation , materials science , phase (matter) , martensite , transformation (genetics) , crystallography , optical microscope , shear (geology) , vacancy defect , shear matrix , mineralogy , scanning electron microscope , chemistry , metallurgy , microstructure , composite material , gene , amorphous metal , biochemistry , organic chemistry , alloy
Crystals of (Ca 1.955 □ 0.045 )(Si 0.91 P 0.09 )O 4 , where □ denotes a vacancy, have been prepared and examined by XRD, optical microscopy, SEM, and AFM. At 20°C, the crystals are composed of 38%α′ L and 62%β phases. Upon cooling to −185°C, the α′ L ‐ to β‐phase transformation occurs, which increases the β‐phase composition to 72%. The transformation is also accompanied by the formation of platelike surface reliefs. The surface relief angles have been determined from observations (7.9°± 0.2°) and calculations based on a phenomenological analysis (7.84°). The fair agreement of these values indicates that the transformation is martensitic and mainly governed by a shear mechanism.