Physical and Piezoelectric Properties of APCI Materials

Material:	840	841	850	855	856	880
Relative Dielectric Constant
KT	1250	1350	1900	3400	4100	1000
Dielectric Dissipation Factor (Dielectric Loss (%)*
tan	0.4	0.35	1.4	1.9	2.7	0.35
Curie Point (°C)**
Tc	325	320	360	200	150	310
Electromechanical Coupling Factor (%)
kp	0.59	0.60	0.63	0.68	0.65	0.50
k33	0.72	0.68	0.72	0.76	0.73	0.62
k31	0.35	0.33	0.36	0.40	0.36	0.30
k15	0.70	0.67	0.68	0.66	0.65	0.55
Piezoelectric Charge Constant (10-12 C/N or 10-12 m/V)
d33	290	300	400	600	620	215
-d31	125	109	175	276	260	95
d15	480	450	590	720	710	330
Piezoelectric Voltage Constant (10-3 Vm/N or 10-3 m2/C)
g33	26.5	25.5	26	21.0	18.5	25
-g31	11	10.5	12.4	9.0	8.1	10
g15	38	35	36	27	25	28
Young's Modulus (1010 N/m2)
YE11	8	7.6	6.3	5.9	5.8	9
YE33	6.8	6.3	5.4	5.1	4.5	7.2
Frequency Constants (Hz*m or m/s)
NL (longitudinal)	1524	1700	1500	1390	---	1725
NT (thickness)	2005	2005	2032	1785	1980	2110
NP (planar)	2130	2055	1980	1920	---	2120
Density (g/cm3)
	7.6	7.6	7.7	7.6	7.5	7.6
Mechanical Quality Factor
Qm	500	1400	80	65	72	1000

All values nominal; measurements made 24 hours after polarization.
Maximum voltage:
     5-7 VAC /mil for 850,855,856 VDC ~2X.
     9-11 VAC /mil for 840,841,880 VDC ~2X.
*At 1 kHz, low field.
**Maximum operating temperature = Curie point/2.