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Lead-free ferroelectric material for ferroelectric refrigerator and preparation method of lead-free ferroelectric material
The invention provides a lead-free ferroelectric material for a ferroelectric refrigerator and a preparation method of the lead-free ferroelectric material, belonging to the field of electronic ceramics. The material adopts barium titanate ceramic as a basis material, comprises one or more rear earth ion R3<+>substitutes, wherein A site substitution-(Ba1-1.5xRx)TiO3, B site substitution-Ba(RyTi1-0.75y)O3 and A-B-site simultaneous substitution-(Ba1-1.5xRx)(R`yTi1-0.75y)O3 can be performed in a rear earth ion barium titanate lattice, wherein R represents one or a combination of more different rear earth elements of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium. According to the material, the sintering density can reach over 98 percent, the electrical resistivity reaches over the order of magnitude of 10<11> omega.cm, the electrocaloric effect is higher than 0.20K.m/MV, an adiabatic temperature change peak of the electrocaloric effect is continuously adjustable in an ultra-wide temperature range of 50 DEG C below zero to 150 DEG C, so that the practical application requirements of the ferroelectric refrigerator can be met.
Lead-free ferroelectric material for ferroelectric refrigerator and preparation method of lead-free ferroelectric material
The invention provides a lead-free ferroelectric material for a ferroelectric refrigerator and a preparation method of the lead-free ferroelectric material, belonging to the field of electronic ceramics. The material adopts barium titanate ceramic as a basis material, comprises one or more rear earth ion R3<+>substitutes, wherein A site substitution-(Ba1-1.5xRx)TiO3, B site substitution-Ba(RyTi1-0.75y)O3 and A-B-site simultaneous substitution-(Ba1-1.5xRx)(R`yTi1-0.75y)O3 can be performed in a rear earth ion barium titanate lattice, wherein R represents one or a combination of more different rear earth elements of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium. According to the material, the sintering density can reach over 98 percent, the electrical resistivity reaches over the order of magnitude of 10<11> omega.cm, the electrocaloric effect is higher than 0.20K.m/MV, an adiabatic temperature change peak of the electrocaloric effect is continuously adjustable in an ultra-wide temperature range of 50 DEG C below zero to 150 DEG C, so that the practical application requirements of the ferroelectric refrigerator can be met.
Lead-free ferroelectric material for ferroelectric refrigerator and preparation method of lead-free ferroelectric material
BAI YANG (Autor:in) / HAN FEI (Autor:in) / XIE SI (Autor:in) / QIAO LIJIE (Autor:in)
24.02.2016
Patent
Elektronische Ressource
Englisch
IPC:
C04B
Kalk
,
LIME
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