US2015075182A1PendingUtilityA1

Methods to improve the performance of electrocaloric ceramic dielectric cooling device

31
Assignee: NASCENT DEVICES LLCPriority: Sep 18, 2013Filed: Sep 9, 2014Published: Mar 19, 2015
Est. expirySep 18, 2033(~7.1 yrs left)· nominal 20-yr term from priority
Inventors:Ailan Cheng
F25B 2321/001F25B 21/00H10N 15/15Y02B30/00
31
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

A cooling device, which can cause cooling or heat-pumping, comprising: multilayer electrocaloric ceramic modules as a refrigerant where said modules are comprised of modified BaTiO 3 or bismuth based solid solution with PbTiO 3 , wherein said modules have more than one ferroelectric phase in generating an electrocaloric effect.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . A cooling device, which can cause cooling or heat-pumping, comprising:
 multilayer electrocaloric ceramic modules as a refrigerant where said modules are comprised of modified BaTiO 3  or bismuth based solid solution with PbTiO 3 , wherein said modules have more than one ferroelectric phase in generating an electrocaloric effect.   
     
     
         2 . The device of  claim 1 , wherein a ceramic layer in the multilayer modules is thicker than 0.5 
     
     
         3 . The device of  claim 1 , wherein:
 all ceramic layers in the multilayer modules have the same ceramic composition and a thickness, wherein   the thickness of each ceramic layer is different than a layer immediately adjacent to it.   
     
     
         4 . The device of  claim 1 , wherein the composition of each ceramic layer in the multilayer modules is different than one immediately adjacent to it, so that one layer has a composition A and the next layer has composition B and the resulting multilayer module has an ABABAB structure. 
     
     
         5 . The device of  claim 1 , wherein each ceramic layer in the multilayer modules is selected from the group consisting of Ba(Ti 1-x Sn x )O 3 where 0.08≦x≦0.20, Ba(Ti 1-x Zr x )O 3  where 0.1≦x≦0.25; Ba(Ti 1-x Hf x )O 3 where 0.08≦x≦0.25, (Ba 1-x Sr x )(Ti 1-y Zr y )O 3 where 0.08 23  x≦0.2, and 0.1≦y≦0.25, (Ba 1-x Sr x )TiO 3  where 0.15≦x≦0.4, (Ba 1-x Sr x )(Ti 1-y Sn y )O 3  where 0.1≦x≦0.3 and 0.05≦y≦0.3. 
     
     
         6 . The ceramic layer of  claim 5 , further comprising a flux system, said flux system comprising a glass-forming cation, a flux, an A-site modifier and a B-site modifier, where:
 the glass-forming cation is selected from the group consisting of B 2 O 3 , SiO 2 , and GO 2 ;   the flux is selected from the group consisting of PbO, BaO, SrO, and CaO;   the A-site modifier is selected from the group consisting of CdO, ZnO, Li 2 O, and CuO; and
 the B-site modifier is selected from the group consisting of Bi 2 O 3 , Y 2 O 3 , Sb 2 O 5 , WO 3 , and Nb 2 O 5 . 
   
     
     
         7 . The device of  claim 5 , wherein in Ba(Ti 1-x Sn x )O 3 , 0.1≦x≦0.15, in Ba(Ti 1-x Hf x )O 3 , 0.15≦x≦0.20 and in (Ba 1-x Sr x )(Ti 1-y Zr y )O 3 , 0.09≦x≦0.15 and 0.1≦y≦0.25. 
     
     
         8 . The ceramic layer of  claim 7 , further comprising a flux system, said flux system comprising a glass-forming cation, a flux, an A-site modifier and a B-site modifier, where:
 the glass-forming cation is selected from the group consisting of B 2 O 3 , SiO 2 , and GeO 2 ;   the flux is selected from the group consisting of PbO, BaO, SrO, and CaO;   the A-site modifier is selected from the group consisting of CdO, ZnO, Li 2 O, and CuO; and
 the B-site modifier is selected from the group consisting of Bi 2 O 3 , Y 2 O 3 , Sb 2 O 5 , WO 3 , and Nb 2 O 5 . 
   
     
     
         9 . The device of  claim 1 , wherein each ceramic layer in the multilayer modules is selected from the group consisting of: (Ba 0.3 Na 0.7 )(Ti 0.3 Nb 0.7 )O 3 , Na 0.5 Bi 0.5 TiO 3 , (1-Y) (Na 0.5 Bi 0.5 )TiO 3 — y BaTiO 3  where 0.1≦y≦0.9, xBaTiO 3 -(1-x)((K 1/2 Na 1/2 )NbO 3 ) where 0.1≦x≦0.9, Ba(Zr x Ti 1-x )O 3 -y(Ba 1-z Ca z )TiO 3  where 0.15≦x≦0.25, 0.2≦z≦0.4, and 0.2≦y≦0.4, xKNbO 3 — (1-x)(BaTiO 3 —(Bi 0.5 Na 0.5 )TiO 3 ) where 0≦x≦0.2. 
     
     
         10 . The ceramic layer of  claim 9 , further comprising a flux system, said flux system comprising a glass-forming cation, a flux, an A-site modifier and a B-site modifier, where:
 the glass-forming cation is selected from the group consisting of B 2 O 3 , SiO 2 , and GeO 2 ;   the flux is selected from the group consisting of PbO, BaO, SrO, and CaO;   the A-site modifier is selected from the group consisting of CdO, ZnO, Li 2 O, and CuO; and   the B-site modifier is selected from the group consisting of Bi 2 O 3 , Y 2 O 3 , Sb 2 O 5 , WO 3 , and Nb 2 O 5 .   
     
     
         11 . The device of  claim 1 , wherein each ceramic layer in the multilayer modules has the formula (1-x)BaTiO 3 -xR, where:
 R is selected from the group consisting of LiTaO 3 , LiNbO 3 , LiSbO 3 , SrHfO 3 , BaHfO 3 , CaHfO 3 , CaZrO 3 , SrZrO 3 , (K 0.5 Bi 0.5 )TiO 3 , (Na 0.5 Bi 0.5 )TiO 3 , (Li 0.5 Bi 0.5 )TiO 3 , and their combinations, where 0.8<x<1 for LiTaO 3 , LiNbO 3 , LiSbO 3 , where 0<x<0.5 for (K 0.5 Bi 0.5 )TiO 3 , (Na 0.5 Bi 0.5 )TiO 3 , (Li 0.5 Bi 0.5 )TiO 3 ; and 0<x<0.5 for SrHfO 3 , BaHfO 3 , CaHfO 3 , CaZrO 3 , SrZrO 3 .   
     
     
         12 . The ceramic layer of  claim 11 , further comprising a flux system, said flux system comprising a glass-forming cation, a flux, an A-site modifier and a B-site modifier, where:
 the glass-forming cation is selected from the group consisting of B 2 O 3 , SiO 2 , and GeO 2 ;   the flux is selected from the group consisting of PbO, BaO, SrO, and CaO;   the A-site modifier is selected from the group consisting of CdO, ZnO, Li 2 O, and CuO; and
 the B-site modifier is selected from the group consisting of Bi 2 O 3 , Y 2 O 3 , Sb 2 O 5 , WO 3 , and Nb 2 O 5 . 
   
     
     
         13 . The device of  claim 1 , wherein each ceramic layer in the multilayer modules has the formula (1-x)BaTiO 3 -xR, where:
 R is selected from the group consisting of (K 0.5 Bi 0.5 )TiO 3 , (Na 0.5 Bi 0.5 )TiO 3 , (Li 0.5 Bi 0.5 )TiO 3 , and their combinations, where 0<x<0.3.   
     
     
         14 . The ceramic layer of  claim 13 , further comprising a flux system, said flux system comprising a glass-forming cation, a flux, an A-site modifier and a B-site modifier, where:
 the glass-forming cation is selected from the group consisting of B 2 O 3 , SiO 2 , and GeO 2 ;   the flux is selected from the group consisting of PbO, BaO, SrO, and CaO;   the A-site modifier is selected from the group consisting of CdO, ZnO, Li 2 O, and CuO; and   the B-site modifier is selected from the group consisting of Bi 2 O 3 , Y 2 O 3 , Sb 2 O 5 , WO 3 , and Nb 2 O 5 .   
     
     
         15 . The device of  claim 1 , wherein each ceramic layer in the multilayer modules exhibits adiabatic temperature change of more than 3.5° C. under an applied electric field equal or less than 15 MVm. 
     
     
         16 . The device of  claim 1 , wherein each ceramic layer in the multilayer modules exhibits adiabatic temperature change of more than 4° C. under an applied electric field of equal or less than 15 MVm. 
     
     
         17 . The device of  claim 1 , wherein each ceramic layer in the multilayer modules exhibits adiabatic temperature change of more than 4.5° C. under an applied electric field equal or less than 15 MVm. 
     
     
         18 . The device of  claim 1 , wherein each ceramic layer in the multilayer modules has a thickness greater than 1 μm. 
     
     
         19 . The ceramic layers of  claim 1  are a bismuth based solid solution with PbTiO 3 , (1-x)BiRO 3 -xPbTiO 3 , where:
 R is selected from the group consisting of Fe, Mn, Cu, Sc, In, Ga, Yb, Mg 1/2 Ti 1/2 , Zn 1/2 Ti 1/2 , Co 1/2 Ti 1/2 , Mg 1/2 Zr 1/2 , Zn 1/2 Zr 1/2 , Mg 1/2 Sn 1/2 , Mg 2/3 Nb 1/3 , Zn 2/3 Nb 1/3 , Mg 2/3 Ta 1/3 , Zn 2/3 Nb 1/3 , Co 2/3 Nb 1/3 , Co 2/3 Ta 1/3 , Mg 3/4 W 1/4 , Co 3/4 W 1/4 ; and 0.05≦x≦0.95. 
 
     
     
         20 . A cooling device, which can cause cooling or heat-pumping, comprising:
 multilayer electrocaloric ceramic modules as a refrigerant wherein said modules have more than one ferroelectric phase in generating an electrocaloric effect and wherein each ceramic layer in the multilayer modules has the formula La-modified Pb(ZrTi)O 3  ((PbLa x )(ZrTi)O 3 ) where x is 0.08≦x≦0.12.   
     
     
         21 . A cooling device, which can cause cooling or heat-pumping, comprising:
 multilayer electrocaloric ceramic modules as a refrigerant wherein said modules have more than one ferroelectric phase in generating an electrocaloric effect and wherein each ceramic layer in the multilayer modules has the formula (1-x)ABO 3 +xPbTiO 3 , where:   ABO 3 is selected from the group consisting of Pb(Mg 1/2 W 1/2 )O 3 , where 0.4≦x≦0.65,   Pb(Mg 1/3 Ta 2/3 )O 3  where 0.3≦x≦0.5, Pb(Ni 1/3 Nb 2/3 )O 3  where 0.3≦x≦0.5,   Pb(Fe 1/2 Nb 1/2 )O 3 where 0.04≦x≦0.15, Pb(Mg 1/3 Nb 2/3 )O 3  where 0.25≦x≦0.45,   Pb(Zn 1/3 Nb 2/3 )O 3  where 0.05≦x≦0.2, Pb(Mn 1/3 Nb 2/3 )O 3  where 0.15≦x≦to 0.35,   Pb(Sc 1/2 Ta 1/2 )O 3  where 0.35≦x≦0.55, Pb(Co 1/3 Nb 2/3 )O 3  where 0.3≦x≦0.5,   Pb(Sc 1/2 Nb 1/2 )O 3  where 0.35≦x≦0.52, Pb(Co 1/2 W 1/2 )O 3  where 0.35≦x≦0.55,   Pb(In 1/2 Nb 1/2 )O 3  where 0.30≦x≦0.45, Pb(Na 1/2 Bi 1/2 )O 3  where 0.05≦x≦0.25,   Pb(Yb 1/2 Nb 1/2 )O 3  where 0.4≦x≦0.6, PbSnO 3  where 0.3≦x≦0.5, and PbHfO 3  where 0.4≦x ≦0.6.   
     
     
         22 . A cooling device, which can cause cooling or heat-pumping, comprising:
 multilayer electrocaloric ceramic modules as a refrigerant wherein said modules have more than one ferroelectric phase in generating an electrocaloric effect and wherein each ceramic layer in the multilayer modules has the formula (1-x)(K z Na y Li 1-z-y )NbO 3 — xAZrO 3 , where:   0<z<1;   0<y<1;     0 . 05 ≦x≦0.2; and   A is selected from the group consisting of Ca, Sr, and Ba.   
     
     
         23 . The ceramic layer of  claim 22 , further comprising a flux system, said flux system comprising a glass-forming cation, a flux, an A-site modifier and a B-site modifier, where:
 the glass-forming cation is selected from the group consisting of B 2 O 3 , SiO 2 , and GeO 2 ;   the flux is selected from the group consisting of PbO, BaO, SrO, and CaO;   the A-site modifier is selected from the group consisting of CdO, ZnO, Li 2 O, and CuO; and   the B-site modifier is selected from the group consisting of Bi 2 O 3 , Y 2 O 3 , Sb 2 O 5 , WO 3 , and Nb 2 O 5 .   
     
     
         24 . The ceramic layer of  claim 22  wherein Zr is substituted by a zirconium composition selected from the group consisting of (ZrHf), (ZrSn) and (ZrTi). 
     
     
         25 . The ceramic layer of  claim 24 , further comprising a flux system, said flux system comprising a glass-forming cation, a flux, an A-site modifier and a B-site modifier, where:
 the glass-forming cation is selected from the group consisting of B 2 O 3 , SiO 2 , and GeO 2 ;   the flux is selected from the group consisting of PbO, BaO, SrO, and CaO;   the A-site modifier is selected from the group consisting of CdO, ZnO, Li 2 O, and CuO; and   the B-site modifier is selected from the group consisting of Bi 2 O 3 , Y 2 O 3 , Sb 2 O 5 , WO 3 , and Nb 2 O 5 .   
     
     
         26 . The flux of  claim 25 , wherein the amount of flux is less than 5 mol %.

Join the waitlist — get patent alerts

Track US2015075182A1 — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.