At laboratory condition

performances of Pb[(Zn

1/3

Nb

2/3

)

x

Zr

y

Ti

1-x-y

]

O

3

are studied experimently.Changing the ratio of Zr/Ti

replacing Pb with La and changing mol fraction of Pb(Zn

1/3

Nb

2/3

)O

3

piezoelectric coefficient d

33

and Curie temperature T

c

may change greatly.Replacing Pb with a few La

d

33

may increase effectively

meanwhile

T

c

decreases apparently.As mol fraction of Pb(Zn

1/3

Nb

2/3

)O

3

increases

d

33

value increases relatively

T

c

decreases lightly.When the ratio of Zr/Ti equals to 33.5/36.5

x equals to 0.34

the performances of material are optimum.In this case

d

33

T

c

K

p

（ele

ctro-mechanical coupling factor）and ε

T

r

（permittivity） could be 460×10

-12

C·N

-1

280 ℃

0.59

2 400 respectively.