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Rock-salt type reconstructed superlattice structure microwave dielectric ceramic material and preparation method

A microwave dielectric ceramic and superlattice technology is applied in the field of high-Q microwave dielectric ceramic materials and their preparation, and the field of microwave dielectric ceramic materials can solve the problem of not studying the phase transition process in detail, and achieve the improvement of comprehensive microwave dielectric properties, Stable performance and improved performance

Active Publication Date: 2022-03-29
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the researchers found that Li 3 NbO 4 Three solid solutions with orthorhombic (Fddd), ordered cubic (I-43m) and disordered cubic (Fm-3m) structures were formed in the -MgO pseudobinary system, however they did not study the phase transition process in detail, we think Composition-driven phase transition should be a continuous process

Method used

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  • Rock-salt type reconstructed superlattice structure microwave dielectric ceramic material and preparation method
  • Rock-salt type reconstructed superlattice structure microwave dielectric ceramic material and preparation method
  • Rock-salt type reconstructed superlattice structure microwave dielectric ceramic material and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Step 1: Magnesium carbonate basic (Mg(OH) 2 4MgCO 3 ·5H 2 O), Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 、TiO 2 and CuO are prepared according to the mass ratio of 49.4%, 32.1%, 13.8%, 0.3%, 3.6% and 0.8% respectively, and the batching forms a mixture.

[0060] Step 2: a ball mill; use zirconia balls as the ball milling medium, and grind for 6 hours according to the mass ratio of mixture: balls: alcohol as 1:5:2 to obtain a uniformly mixed ball mill;

[0061] Step 3: drying and sieving; drying the ball mill material obtained in step 2 at 70°C and passing through a 100-mesh sieve to obtain a dry powder;

[0062] Step 4: Pre-calcining; the dry powder obtained in Step 3 is placed in an alumina crucible, and pre-fired at 1010°C for 3 hours to obtain a pre-fired powder;

[0063] Step 5: secondary ball milling; the base material obtained in step 4 is ball milled for the second time, using zirconia balls as the ball milling medium, and grinding for 3 hours according to the mass...

Embodiment 2

[0068] Step 1: Magnesium carbonate basic (Mg(OH) 2 4MgCO 3 ·5H 2 O), Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 、TiO 2 and ZnO are prepared according to the mass ratio of 47.8%, 32.6%, 13.5%, 0.4%, 4.5% and 1.2% respectively, and the batching forms a mixture.

[0069] Step 2: a ball mill; use zirconia balls as the ball milling medium, and grind for 7 hours according to the mass ratio of mixture: balls: alcohol as 1:5:2 to obtain a uniformly mixed ball mill;

[0070] Step 3: drying and sieving; drying the ball mill material obtained in step 2 at 70°C and passing through a 100-mesh sieve to obtain a dry powder;

[0071] Step 4: Pre-calcining; the dry powder obtained in Step 3 is placed in an alumina crucible, and pre-fired at 1050°C for 3 hours to obtain a pre-fired powder;

[0072] Step 5: secondary ball milling; the base material obtained in step 4 is ball milled for the second time, using zirconia balls as the ball milling medium, and grinding for 3 hours according to the mass...

Embodiment 3

[0077] Step 1: Magnesium carbonate basic (Mg(OH) 2 4MgCO 3 ·5H 2 O), Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 、TiO 2 and NiO, respectively according to the mass ratio of 42.7%, 33.7%, 13.8%, 0.56%, 7.84% and 1.4%, prepare materials, and the batching forms a mixture;

[0078] Step 2: a ball mill; use zirconia balls as the ball milling medium, and grind for 7 hours according to the mass ratio of mixture: ball: alcohol: 1:7:4 to obtain a uniformly mixed ball mill;

[0079] Step 3: drying and sieving; drying the ball mill material obtained in step 2 at 70°C and passing through a 100-mesh sieve to obtain a dry powder;

[0080] Step 4: Pre-calcining; the dry powder obtained in Step 3 is placed in an alumina crucible, and pre-fired at 1090°C for 3 hours to obtain a pre-fired powder;

[0081] Step 5: secondary ball milling; the base material obtained in step 4 is ball milled for the second time, using zirconia balls as the ball milling medium, and grinding for 4 hours according to th...

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Abstract

The invention provides a rock-salt type reconstructed superlattice structure microwave dielectric ceramic material and a preparation method thereof. The general chemical formula of the material is Li 3+x (Mg 1‑y A y ) 2‑2x Nb 1‑x Ti 2x o 6 , where A is Cu 2+ ,Zn 2+ , Ni 2+ or Co 2+ One or more of divalent ions; 0.08≤x≤0.3 or 0.8≤x≤0.92 and 0<y≤0.05; the preparation method of the present invention comprises the steps of: batching, ball milling, drying and sieving, pre-calcination, Granulation, compression molding, sintering. The material prepared by the present invention has a typical rock-salt-type reconstructed short-range ordered superlattice structure, highly dense microscopic appearance, no pores and no microcracks, high quality factor, Q×f between 90000GHz and 130000GHz, relatively medium Electrical constant ε r Between 16 and 21, the frequency temperature coefficient τ f Between -30ppm / ℃~+3ppm / ℃. The formula does not contain volatile toxic metals such as Pb and Cd, and has stable performance, which can meet the application requirements of modern microwave devices.

Description

technical field [0001] The invention belongs to the technical field of preparation of electronic information functional materials, and relates to a microwave dielectric ceramic material with a reconstructed superlattice structure obtained by regulating the rock-salt phase transition process in a solid solution, especially a high-Q microwave dielectric ceramic material and its preparation method. Background technique [0002] Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave (300MHz~300GHz) frequency band circuits and perform one or more functions. They are key basic materials in modern communication technology and are widely used in dielectric resonators and filters. , dielectric substrate, dielectric waveguide circuit, microwave capacitor, duplexer, antenna and other microwave components. In high-frequency microwave circuits, many microwave devices need to use dielectric ceramic materials as substrates, making microwave cera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/462C04B35/622C04B35/64
CPCC04B35/495C04B35/462C04B35/622C04B35/64C04B2235/3251C04B2235/3203C04B2235/3206C04B2235/3232C04B2235/3281C04B2235/3279C04B2235/3275C04B2235/3284C04B2235/6562C04B2235/6567C04B2235/76C04B2235/762C04B2235/96
Inventor 方梓烜唐斌张星张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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