フラックス法による2Ca_2SiO_4・CaCl_2の結晶成長
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Studies on crystal growth of 2Ca2SiO4⋅CaCl2 which suggested a chlorine analogue to calcio-chondrodite (2Ca2SiO4⋅Ca(OH)2) were attempted by slow cooling from CaCl2 flux.For crystal growth of 2Ca2SiO4⋅CaCl2, CaCl2 was found to be suitable as flux, and SiO2 was used as starting material which was as suitable as calcium silicates. The mixtures of CaCl2 of about 60g and SiO2 of 1.0-5.0g in the Pt crucible were soaked for 3.0-9.0 hours at 995°-1180°C and then slowly cooled to about 500°C with a rate of 5°C per hour.The largest crystal as large as 30mm in size weighed by 14.5g was grown, when mixture of CaCl2 of 54.1g and SiO2 of 4.0g was soaked at 1080°C. In this case, all the constituents of 2Ca2SiO4⋅CaCl2 in flux resulted to crystallize into a single crystal, which should be most desirable at flux method.The processes of reaction of CaCl2 with SiO2 and crystal growth of 2Ca2SiO4⋅CaCl2 are inferred as follow:CaCl2 reacts with H2O absorbed in itself and SiO2 for heating process.SiO2+2CaCl2+2H2O→Ca2SiO4+4HCl………………………………………(1)On slow cooling, Ca2SiO4 in equation (1) reacts with CaCl2, and after that, crystal-nuclei formation and crystal growth take place.2Ca2SiO4+CaCl2→2Ca2SiO4⋅CaCl2……………………………………………(2)Combining equations (1) and (2), 2SiO2+5CaCl2+4H2O→2Ca2SiO4⋅CaCl2+8HClThe unit monoclinic cell constants of the crystal are a0=9.84Å; b0=6.78Å; c0=10.9Å; angle β=105°30′. The space group is C52h=P21/c.The mean refractive index of the crystal is n=1.66.
- 社団法人日本セラミックス協会の論文
- 1970-09-01
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