ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Five types of Ca2SiO4 solid solutions, doped with either P5+, Ge4+, Fe3+, Mg2+, or Ba2+, were prepared and examined by high-temperature X-ray diffractometry up to 800°C. The starting and finishing temperatures were determined for the α′L-to-β martensitic transformation during cooling and the reverse (β-to-α′L) transformation during heating. These four types of transformation temperatures for the preparations doped with either P5+ or Ge4+ steadily decreased with increasing substituted fraction. The effect of the substitution on the decrease for each transformation temperature was quantitatively evaluated by ΔT/x, where ΔT is the difference in the transformation temperatures between the solid solutions and pure Ca2SiO4, and x represents the fraction substituted for Si4+ or Ca2+ in the α′L-phase structure. The evaluated value for the substitution of P5+ was more than 3 times that of Ge4+. The effect of the substituent ions mentioned above, together with Na+ and Sr2+, on the lowering of the starting temperature of the α′L-to-β transformation was principally determined by the differences in the ionic radius between the interchanging cations.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1151-2916.2002.tb00356.x
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