Title:
PIEZOCERAMIC COMPOSITION, PIEZOCERAMIC BODY COMPRISING SAID COMPOSITION AND A METHOD FOR PRODUCING SAID COMPOSITION AND SAID BODY
Document Type and Number:
WIPO Patent Application WO2003101946
Kind Code:
A3
Abstract:
The invention relates to a piezoceramic composition with the general empirical formula Pb1-aREbZrxTiyTRzO3, in which RE represents a rare-earth element, selected from a group comprising europium, gadolinium, lanthanum, neodymium, praseodymium, promethium and/or samarium, with a rare-earth element fraction b, TR represents at least one transition metal, selected from the group comprising chromium, iron and/or manganese, with a transition metal valency WTR and a transition metal fraction z and whereby the following interrelation is valid: z > b/(4 - WTR). Homogenous PZT crystals with a maximum particle size are obtained even at low sintering temperatures by a non-stoichiometric dosing ratio of transition metal dosage to rare-earth element dosage. By varying the dosages, the piezoelectric characteristics of a PZT ceramic with said composition can be modified from those of a classic soft PZT to those of a classic hard PZT. The piezoceramic body is for example a monolithic, multi-layer piezoactuator, which can be used for multiple injections in the engine of a motor vehicle, as a result of a high d33 coefficient and low internal dissipation in the high-level signal range.
Inventors:
BOEDINGER HERMANN (DE)
LUBITZ KARL (DE)
SCHUH CARSTEN (DE)
LUBITZ KARL (DE)
SCHUH CARSTEN (DE)
Application Number:
PCT/DE2003/001430
Publication Date:
October 27, 2005
Filing Date:
May 05, 2003
Export Citation:
Assignee:
SIEMENS AG (DE)
BOEDINGER HERMANN (DE)
LUBITZ KARL (DE)
SCHUH CARSTEN (DE)
BOEDINGER HERMANN (DE)
LUBITZ KARL (DE)
SCHUH CARSTEN (DE)
International Classes:
C01G23/00; C01G25/00; C04B35/491; H01L41/083; H01L41/187; H01L41/43; H01L41/273; (IPC1-7): C04B35/491; H01L41/187; C01G25/00; C01G23/00
Other References:
BYKOV I P ET AL: "Investigation of chromium impurities charge state and chemical bonds in PLZT ceramic", JOURNAL OF THE PHYSICS AND CHEMISTRY OF SOLIDS, JULY 1995, UK, vol. 56, no. 7, pages 919 - 923, XP000889272, ISSN: 0022-3697
MURAKAMI S ET AL: "Low-temperature luminescence and energy transfer processes in Eu/sup 3+/, Nd/sup 3+/, and Cr-doped sol-gel PLZT ceramics", TWELFTH INTERNATIONAL CONFERENCE ON DYNAMICAL PROCESSES IN EXCITED STATES OF SOLIDS. DPC'99, HUMACAO, PUERTO RICO, 23-27 MAY 1999, vol. 83-84, Journal of Luminescence, Nov. 1999, Elsevier, Netherlands, pages 215 - 219, XP002258021, ISSN: 0022-2313
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 05 30 April 1998 (1998-04-30)
KALA T ET AL: "The study of valency states of manganese ions in Pb(Zr,Ti)O/sub 3/-La2O/sub 3/-MnO/sub 2/ solid solutions by the EPR method", FERROELECTRICS LETTERS SECTION, 1992, UK, vol. 14, no. 5-6, pages 135 - 144, XP008022944, ISSN: 0731-5171
KALA T: "THE STUDY OF THERMALLY STIMULATED SHORT-CIRCUIT CURRENTS IN MODIFIED PB(ZR,TI)O3", CZECHOSLOVAK JOURNAL OF PHYSICS, PRAGUE, CZ, vol. B38, no. 6, 1988, pages 680 - 688, XP008022962, ISSN: 0011-4626
LAL R ET AL: "EVOLUTION OF MICROSTRUCTURE IN PZT CERAMICS WITH SUPERVALENT, ISOVALENT AND SUBVALENT CATION ADDITIONS", KEY ENGINEERING MATERIALS, AEDERMANNSDORF, CH, vol. 29-31, 1989, pages 609 - 617, XP008022908
MURAKAMI S ET AL: "Low-temperature luminescence and energy transfer processes in Eu/sup 3+/, Nd/sup 3+/, and Cr-doped sol-gel PLZT ceramics", TWELFTH INTERNATIONAL CONFERENCE ON DYNAMICAL PROCESSES IN EXCITED STATES OF SOLIDS. DPC'99, HUMACAO, PUERTO RICO, 23-27 MAY 1999, vol. 83-84, Journal of Luminescence, Nov. 1999, Elsevier, Netherlands, pages 215 - 219, XP002258021, ISSN: 0022-2313
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 05 30 April 1998 (1998-04-30)
KALA T ET AL: "The study of valency states of manganese ions in Pb(Zr,Ti)O/sub 3/-La2O/sub 3/-MnO/sub 2/ solid solutions by the EPR method", FERROELECTRICS LETTERS SECTION, 1992, UK, vol. 14, no. 5-6, pages 135 - 144, XP008022944, ISSN: 0731-5171
KALA T: "THE STUDY OF THERMALLY STIMULATED SHORT-CIRCUIT CURRENTS IN MODIFIED PB(ZR,TI)O3", CZECHOSLOVAK JOURNAL OF PHYSICS, PRAGUE, CZ, vol. B38, no. 6, 1988, pages 680 - 688, XP008022962, ISSN: 0011-4626
LAL R ET AL: "EVOLUTION OF MICROSTRUCTURE IN PZT CERAMICS WITH SUPERVALENT, ISOVALENT AND SUBVALENT CATION ADDITIONS", KEY ENGINEERING MATERIALS, AEDERMANNSDORF, CH, vol. 29-31, 1989, pages 609 - 617, XP008022908
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