The crystal structures and properties of TXAX-A and TXAX-MA currently mass produced and available are as follows:

		Potassium hexatitanate
Crystal structure
Crystal system		Monoclinic
Space group		C2/m
Structure		Tunnel
Lattice constant	a(nm)	1.558
	b(nm)	0.382
	c(nm)	0.911
	β(°)	99.76
Molecules per unit cell		2

Table B1-1a

	TXAX-A	TXAX-MA
Scanning electron microscope image
Chemical name	Potassium hexatitanate	Potassium hexatitanate
Chemical formula	K2Ti6O13	K2Ti6O13
Structure	Tunnel	Tunnel
Shape	Plate-like shape	Plate-like shape
Color	Light yellow	Light yellow
Size	Mean length:150 Mean width:30 Mean thickness:(10)	Mean length:65 Mean width:13 Mean thickness:(3)
pH	8	8
Specific surface area (m2/g)	0.75	1.50
Particle density (g/cm3)	3.5	3.6
Bulk density (g/cm3)	0.5	0.2
Melting point (℃)	1310~1350	1310~1350
Moisture content (mass%)	<0.2	<0.4
Mohs hardness	3	3~4
Thermal conductivity * (W/m･K)	1.7(at760℃)
Specific heat * (J/kg･K)	920
Linear expansion coefficient * (×10-6/K)	6.8
Volume resistivity * (Ω･cm)	3.3×1015
Permittivity * (ε)	3.5~3.7

* literature data

Table B1-1b