Evaluation of Phase Diagrams for the Al<SUB>2</SUB>O<SUB>3</SUB>-CaO-SrO System by <I>In-Situ</I> Observation Using Confocal Laser Microscope

Abstract

Phase relations for the Al 2 O 3 -CaO-SrO ternary oxide system were clarified. This ternary system has a high liquidus temperature in most compositions and contained many types of solid solutions with a wide composition range. Hence, it was difficult to predict the precise phase diagrams by using conventional techniques such as chemical equilibration method. In fact, the phase diagram reported formerly contains a considerable amount of prediction and surmise and is far from satisfaction. In the present study, an in-situ observation at increasing temperatures was performed using a high temperature observational system that included a confocal scanning laser microscope (CSLM) in combination with an infrared image furnace as a heating device. As a result, definite images of the samples during melting were obtained, and the advantages of this method for the measurement of this type of ternary oxide system were confirmed. Further, a more appropriate ternary phase diagram and its 1973 K isothermal cross section were predicted.

Development of dense Sr-substituted CaAl12O19 (CA6) ceramics synthesized by sol-gel combustion method

“…In x = 0.3 composition, the decrease in density may be due to the increase of Sr 2+ , as SA 6 has a higher liquidus temperature compared to CA 6 . CA 6 -SA 6 forms a complete solid solution; however, the liquidus increases with the increase in SA 6 [21]; thereby, the densification will progressively be difficult due to the increase in SA 6 .…”

X-ray investigations of solid solutions of monocalcium aluminate and monostrontium aluminate important phases in cement and phosphorescence materials

“…Solid-solution studies in the system CaAl 2 O 4 and SrAl 2 O 4 have been already investigated by several authors. A complete solution series was described by Massazza and Cannas (1959), but limited solid-solution series were described by Ito et al (1977, 1979), Kuroki et al (2009), and Prodjosanto et al (2002, 2003) using X-ray diffraction (XRD) and synchrotron powder data.…”

Thermodynamic Properties of the MnS^|^ndash;CuS0.5 Binary System

“…The method of operation of the CSLM to determine a phase diagram has been reported in detail in the previous work. 8) Samples were prepared by melting mixtures of reagent grade MnS and CuS 0.5 in a graphite crucible under an Ar atmosphere in an induction furnace. The Mn and Cu contents of the prepared samples were analyzed by inductively coupled plasma atomic emission spectroscopy (ICP-AES).…”