304

(2)

Calcium Silicates, Part 2. Microstructure

By Seiji Kondo and Toshiyoshi Yamauchi

Abstract

Experiments have been made of microstructure and refractive indices of the synthetic

products described in Part 1 with the following results:

(1) The 3CaO.SiO2 samples prepared at 1800 are pure analytically as well as optically.

However they contain minute proportions of 2CaO.SiO2 type crystals.

(2) The 2CaO.SiO2 sample prepared at 1700 consists solely of type. It is likely that

inversion of the silicate takes place more suddenly than .

(3) The 3CaO.2SiO2 samples prepared at temperatures varying from 1450 to 1475 seem

to be composed of 3CaO.2SiO2 (or CaO .SiO2), 2CaO.SiO2 and 2CaO.SiO2, although they

are almost pure 3CaO.2SiO2 analytically .

(4) The CaO.SiO2 sample prepared at 1500 is almost pure CaO.SiO2E CaO.SiO2

crystals are not optically biaxial and positive, but are optically uniaxial and negative, their

refractive indices being D=1.650 and D=1 .610.

(5) The results of the observations of those samples which were prepared at temperatures

lower than the maxima but higher than 900 agree very well with the results of the

synthetic experiments given in Part 1 .

(6) All compound prepared at temperatures under 1500, especially at 1300 to 1400,

are apt to dust.

(2) 305

1

4 , 600

CaO:SiO2,

3CaOSiO2, 2CaOSiO2, 3CaO2SiO2CaOSiO2, 1

X

(E. S. Shepherd & G. A. Rankin, Ztschr. f. anorg. Chem. 1911, G. A. Rankin, J. Amer.

Chem. Soc., 19_??_6; J. B. Ferguson & H. E. Merwin, Amer. J. Sci., 1919; W. C. Hansen, J. Amer.

Ceram. Soc., 1928; , 8)

(1) 3CaOSiO2

1600 Rankin 1500

Hansen 1500

Lameller twin (Polysynthetic twin, )

2V () D=1.715 0.005

(2) 2CaOSiO2

() 4

2CaOSiO2

Lameller twin 2V(+)

D=1.715, D=1.720, D=1.737, D-D=0.023

2CaOSiO2

010, 100 2V

D=1.715, D=?, D=1.735, D-D=0.018 6751420

1000

Lime olivineShannonite

2CaOSiO2

2V0 =1.715

2CaOSiO2

675 010 2V(+) 52

60 D=1.642, D=1.645, D=1.654, D-D=0.0130.015

306

(3) 3CaO2SiO2

2V(+) D=1.641, D=1.645, D=1.650, D-D=

0.009

(4) CaOSiO2

, 2

CaOSiO2

1200 001 Lameller twin

D=1.610, D=1.611, D=1.654, -=0.041

CaOSiO2

1200 100 001

2V(-)=39 D=1.616, D=1.629, D=1.631, -=0.015

Wollastonite

1

2

(,

, 81)

2 (

)

B Hartmann

AB D

1.7

1.68 1.683CaOSiO2, 2CaOSiO2

2CaOSiO2, CaOSiO2, 3CaO2SiO2

3 A.

(1) 3CaOSiO2 (1800)

0.03mm Lameller twin

(2) 307

D=1.716, D=1.719

-=0.003

, 3CaOSiO2 ,

( 36, 1136, 8) 3CaOSiO2

(-0.023)

1800 1800

2CaOSiO2

1800

X

1800 2CaOSiO2

0.1mm

-0.023

D=1.712, D=1.716, D=1.735, -=0.022, F-C=0.023 2V(+)50

2CaOSiO2 X

1800 1900 3CaOSiO22CaOSiO2+CaO

CaO R. Brill (1932) 3CaOSiO2X

2CaOSiO2

2CaOSiO2 3CaOSiO2 2CaOSiO2

2CaOSiO2

0.03mm ,

2CaOSiO2 Lameller twin 3CaOSiO2

1800 3CaOSiO2 2CaOSiO2

3CaOSiO2 2CaOSiO2

3/4

(2) 2CaOSiO2 (1700)

3CaOSiO2

1

258 ( )

0.020.05mm,

0.023

Lameller twin

(1) D=1.715, D=1.722,

308

D=1.737, -=0.022, F-C=0.0232V(+)66

RankinWright

Lameller twin 2CaO

SiO2

(3) 3CaO2SiO2 (1475 )

3CaOSiO22CaOSiO2

D=1.639, D=1.649, D=1.655, F-C=

0.020, -=0.016 2CaOSiO2

(2)

2

285 2CaOSiO2 1.68

2CaOSiO2 3CaO2SiO2

(4) CaOSiO2 (1500)

CaOSiO2

D=1.650, D=1.610, F-C=0.019, -=0.040

0.1mm

B.

(1) 3CaOSiO2

600

700

CaO

800

1.68 2CaOSiO2, 3CaO2SiO2, CaOSiO2

900

, CaO

CaOSiO2 1.68

10001100

1.68

( 2 ) 309

1200

1.68 2CaOSiO

1.68 2CaOSiO2

, 2CaOSiO2 CaO1.68

1300

1.6510001.68

1.681200, 2CaOSiO2 CaO

3 ,

1400

1300

Z (100)

0.017

D=1.638, D=1.649,

D=1.655, D-D=0.017, 2V52, F-

C=0.020 2CaOSiO2 (3)

3

95

1.7 2CaOSiO2

2CaOSiO2 Lameller twin

2CaOSiO2

1.6601.680 , 2CaOSiO2,

1450

2CaOSiO2 1.7 2C

aO SiO2 CaO , , 3CaO

SiO2

1500

2CaOSiO2 2CaOSiO2 CaO 2CaOSiO2

0.02mm 2CaOSiO2

310

3CaOSiO22CaOSiO2

2CaOSiO2, Cristobalite

16001500

16001hr 15007hr, 3CaOSiO2

CaO , 2CaOSiO2 2CaOSiO2

1600

2CaOSiO2 2CaOSiO2 0.05mm

3CaOSiO2 2CaOSiO2, 2CaOSiO2

CaO

1650

2CaOSiO2, 3CaOSiO2CaO, 2CaOSiO2 3CaOSiO2

1700

1800 3CaOSiO2 Lameller twin

2CaOSiO2 CaO

(2) 2CaOSiO2

6001100

3CaOSiO2

1200

1300

, 2CaOSiO2 2CaOSiO2 CaO

CaOSiO2

1400

2CaOSiO22CaOSiO2, 2CaOSiO2 CaO CaOSiO2

14501500

2CaOSiO2 , CaO

1600

2CaOSiO2, CaO

(3) 3CaO2SiO2

600800

3CaOSiO22CaOSiO2

900

1000

( 2 ) 311

1100

, 1.68

1200

1.68

1300

1.68

1400

1.682 1 2CaOSiO2 CaOSiO2

1 ( CaOSiO2) CaO

D=1.638, D=1.649, D=1.655D=1.639, D=1.649, D=1.655

2CaOSiO2 2CaOSiO2 2CaOSiO2

1.64 , , 3CaO2SiO2

1450

1.64 CaOSiO2 2CaO

SiO2, 2CaOSiO2 CaO

1475 3CaO2SiO2

(4) CaOSiO2

6001000

1100

2CaOSiO2 CaOSiO2

1200

CaOSiO2, 2CaOSiO2 CaOSiO2

1300

2CaOSiO2 ( ) , CaOSiO2 CaO

1400

CaOSiO2 2CaOSiO2, CaOSiO2

14501500

CaOSiO2

4

(1) 3CaOSiO2 1800

3CaOSiO2 2CaOSiO2

2CaOSiO2 Brill (1932) 3CaOSiO2 2CaOSiO2

, 1800 2CaOSiO23CaOSiO22CaOSiO2

312

+CaO

(2) 2CaOSiO2 16001700

2CaOSiO2 W. C. HansenLameller twin

, twin 2CaO

SiO 1

13001500 2CaOSiO2

,

(3) 3CaO2SiO2 14501475

2CaOSiO2

, 3CaO2SiO2 (CaOSiO2) 2CaOSiO2

2CaOSiO21000

2CaOSiO2 3CaO2SiO2 (CaOSiO2)

3CaO2SiO2

(4) CaOSiO 15001530

, D=1.650, D=1.610,

-=0.040 CaOSiO2

(5)

1

1 3COSiO2

CaCO3600CO2SiO2 800

, (163) CaOSiO2 900CaO ,

CaOSiO22CaOSiO2 13001400 2CaOSiO2CaO

14502CaOSiO2

15003CaOSiO2 1600 2CaOSiO2 3CaOSiO2

2CaOSiO3 16503CaOSiO2 , 1800 2CaO

SiO2 3CaOSiO2

2 2CaOSiO2

1300 2CaOSiO2CaOSiO2 1400 CaOSiO2

14501500 2CaOSiO2 CaOSiO2 2CaOSiO2

1600 2CaOSiO2

3 3CaO2SiO2

12002CaOSiO2 14002CaOSiO2CaOSiO2 3CaO2SiO2

1450 CaOSiO2, 2CaOSiO2,

( 5 ) 313

3CaO2SiO2

4 CaOSiO2

1200 1300 CaOSiO22CaOSiO2

1400 CaOSiO2

(6)

Dusting150013001400 D=1.638, D=1.649, D=1.655

2CaOSiO2

2CaOSiO2 1500

5

1. 1

2. 3CaOSiO21800 3CaOSiO22CaO

SiO2

3. 2CaOSiO21700C 2CaO

SiO2

4. 3CaO2SiO214501475 3CaO2SiO2 ( CaOSiO2), 2CaO

SiO22CaOSiO2

5. CaOSiO21500 CaOSiO2 CaOSiO2,

D=1.650, D=1.610

6. , 9001

7. 150013001400 2CaOSiO2 Dusting

() (92 )