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Crystal oriented ceramics and production method of same

A technology of crystallographic orientation and ceramics, applied in chemical instruments and methods, manufacturing/assembly of piezoelectric/electrostrictive devices, niobium compounds, etc., can solve problems such as damage to piezoelectric properties and inability to realize composition

Inactive Publication Date: 2005-04-27
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, in the application of this method to the isotropic perovskite type potassium sodium niobate (K 1-y Na y NbO 3 ) or its solid solution, sometimes the most desired composition cannot be realized, and since the A-site element and / or B-site element are inevitably contained, there is a concern that the piezoelectric properties will be damaged

Method used

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  • Crystal oriented ceramics and production method of same
  • Crystal oriented ceramics and production method of same
  • Crystal oriented ceramics and production method of same

Examples

Experimental program
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Effect test

Embodiment 1

[0174] (1) Synthesis of NN plate powder

[0175] Bi according to the stoichiometric ratio 2.5 Na 3.5 Nb 5 o 18 (hereinafter, referred to as "BINN5") composition, weighing Bi 2 o 3 Powder, Na 2 CO 3 Powder and Nb 2 o 5 powder, which is wet mixed. Then, 50% by weight of NaCl was added as a flux to this raw material, and dry mixing was performed for 1 hour.

[0176] Then, the prepared mixture was put into a platinum crucible and heated at 850°C for 1 hour. After the flux was completely dissolved, it was further heated at 1100°C for 2 hours to synthesize BINN5. In addition, the temperature increase rate was 200° C. / hour, and the temperature decrease was cooling in the furnace. After cooling, the flux was removed from the reactants by hot water washing to obtain BINN5 powder. The obtained BINN5 powder is a plate-shaped powder with {001} plane as the growth plane.

[0177] Then, add the amount of Na required for NN synthesis to this BINN5 plate powder 2 CO 3 The powde...

Embodiment 2

[0188] Except that the sintering temperature of the plate-shaped molded body after degreasing is 1125° C., according to the same steps as in Example 1, a 0.02 (K 0.5 Na 0.5 ) 0.98}{Nb 0.94 Sb 0.06}O 3 Composition of crystalline oriented ceramics. For the obtained crystal-oriented ceramics, under the same conditions as in Example 1, the density of the sintered body, the average degree of orientation, and the piezoelectric properties were evaluated.

[0189] The relative density of the crystal-oriented ceramics prepared in this embodiment is above 95%. In addition, the quasi-cubic {100} planes are oriented parallel to the band planes, and the average orientation degree of the quasi-cubic {100} planes measured by the Lotgering method reaches 82%. In addition, the evaluation results of the piezoelectric properties at room temperature: d 31 93.2pm / V, k p 0.588 and g 31 It was 16.5×10-3 Vm / N, which was 1.40 times, 1.35 times and 1.79 times higher than the non-oriented sint...

Embodiment 3

[0191] In addition to pressing {Li 0.02 (K 0.5 Na 0.5 ) 0.98}{Nb 0.88 Ta 0.10 Sb 0.02}O 3 The composition is matched with the initial raw materials, and the calcining temperature of the plate-shaped molded body after degreasing is 1125° C., according to the same steps as in Example 1, the production has {Li 0.02 (K 0.5 Na 0.5 ) 0.98}{Nb 0.88 Ta 0.10 Sb 0.02}O 3 Composition of crystalline oriented ceramics. For the obtained crystal-oriented ceramics, under the same conditions as in Example 1, the density of the sintered body, the average degree of orientation, and the piezoelectric properties were evaluated.

[0192] The relative density of the crystal-oriented ceramics prepared in this embodiment is above 95%. In addition, the quasi-cubic {100} planes are oriented parallel to the band shape, and the average orientation degree of the quasi-cubic {100} planes measured by the Lotgering method reaches 81%. In addition, the evaluation results of the piezoelectric pr...

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Abstract

The present invention provides crystal oriented ceramics, and a production method of the same, having a basic composition of isotropic perovskite-based potassium sodium niobate, demonstrating superior piezoelectric characteristics, and having a specific crystal plane oriented to a high degree of orientation. The crystal oriented ceramics as claimed in the present invention is composed of a polycrystalline substance of an isotropic perovskite compound represented by the general formula: {Lix(K1-yNay)1-x}{Nb1-z-wTazSbw}O3 (wherein, 0<=x<=0.2, 0<=y<=1, 0<=z<=0.4, 0<=w<=0.2, x+z+w>0), and a specific crystal plane of each crystal grain that composes said polycrystalline substance is oriented. Such crystal oriented ceramics are obtained by molding a mixture of a first anisotropic shaped powder, for which the growth plane has lattice coherency with a specific crystal plane of the isotropic perovskite compound to be produced, and a first reaction raw material, so that the first anisotropic shaped powder is oriented, followed by heating.

Description

technical field [0001] The present invention relates to crystallographically oriented ceramics and methods of making the same, and more particularly, to materials suitable for use as acceleration sensors, pyroelectric sensors, ultrasonic sensors, electric field sensors, temperature sensors, gas sensors, collision sensors, yaw rate sensors, air bag sensors, Various sensors such as piezoelectric rotary sensors, energy conversion elements such as piezoelectric transducers, low-loss drivers or low-loss resonators such as piezoelectric actuators, ultrasonic motors, and resonators, capacitors, bicrystalline piezoelectric elements, vibration pickups, Piezoelectric materials used in piezoelectric loudspeakers, piezoelectric ignition elements, sonar, piezoelectric buzzers, piezoelectric speakers, oscillators, filters, etc., or dielectrics suitable for capacitors and layered capacitors, etc. Materials, crystal-oriented ceramics such as thermoelectric conversion materials, ion-conducting...

Claims

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Application Information

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IPC IPC(8): C01G33/00C01G35/00C04B35/495C04B35/645H01L41/187
CPCC04B2235/3239C04B2235/3267C04B2235/768C04B2235/3281C04B35/6303C04B2235/3201C04B2235/36C04B2235/3232C04B2235/6025C04B2235/77C01P2002/34C04B2235/3294C04B35/495C01P2002/72C04B2235/5292C04B35/632C04B2235/3279H01L41/187C04B2235/3291C04B2235/3203C04B2235/762C04B2235/3224C04B2235/3298C01P2006/40C04B2235/3208C01G35/006C04B2235/3251C04B2235/787C04B35/645C04B2235/656C04B35/62665C04B2235/3258C01G33/006C04B2235/5436C04B2235/3255C04B2235/3256H10N30/8542H10N30/097
Inventor 野野山龙彦长屋年厚高尾尚史本间隆彦齐藤康善鹰取一雅中村雅也
Owner DENSO CORP
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