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NdCa4O(BO3)3 crystal zero frequency temperature coefficient cut and application

A technology with temperature coefficient and zero frequency, which is applied in the field of zero-frequency temperature coefficient cutting of piezoelectric crystal NdCa4O3 crystal, which can solve the problems of narrow crystal frequency stability range and low electric coupling coefficient

Active Publication Date: 2010-09-29
山东本源晶体科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the problem that the electromechanical coupling coefficient of quartz crystal is low in the prior art, and the frequency stability range of crystals such as lithium tantalate and gallium lanthanum silicate is relatively narrow, the present invention provides NdCa 4 O(BO 3 ) 3 The zero-frequency temperature coefficient of the crystal is cut to achieve a crystal device with high frequency temperature stability, high electromechanical coupling coefficient and piezoelectric constant used in a wide temperature range

Method used

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  • NdCa4O(BO3)3 crystal zero frequency temperature coefficient cut and application
  • NdCa4O(BO3)3 crystal zero frequency temperature coefficient cut and application
  • NdCa4O(BO3)3 crystal zero frequency temperature coefficient cut and application

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Effect test

Embodiment 1

[0043] Example 1: NdCa 4 O(BO 3 ) 3 Crystal Zero Temperature Compensation Cut

[0044] 1. If figure 1 Shown, NdCa 4 O(BO 3 ) 3 crystal positive d 22 The direction of is taken as the positive direction of Y, the Y and Z axes of the physical coordinate axis are parallel to the b and c axes of the crystal axis, the X axis of the physical coordinate axis is perpendicular to the Y and Z axes and follow the right-hand spiral rule. The thickness direction of the crystal is Z, the length direction is X, and the width direction is Y. Rotate in the Y direction according to the right-handed spiral rule at an angle of -20°, which is recorded as (ZXw)-20°. The sample cutting and processing angles are as follows: figure 1 Shown; processing cutting size ratio of thickness: width: length = 1:3:8.

[0045] 2. In NdCa 4 O(BO 3 ) 3 Platinum electrodes are plated on the width direction of the cut sample, and the electrode thickness is 200nm. Place the platinum-plated sample device in a...

Embodiment 2

[0048] As in Example 1, the difference is that (ZXw)-10 ° cut type is also used, and the sample size ratio is thickness: width: length = 1:3:9 frequency device, and its frequency is measured in the range of -140-200 ° C With the change of temperature, the temperature stability of the obtained frequency device is within 25ppm / ℃, see figure 2 ((ZXw)-10° sample) shown.

Embodiment 3

[0050] As in Example 1, the difference is that (ZXw) 0 ° cut type is also used, and the sample size ratio is thickness: width: length = 1: 2.4: 7 frequency device, and its frequency is measured in the range of -140-200 ° C. The temperature change, the temperature stability of the frequency device is within 12ppm / ℃, see figure 2 ((ZXw)0° sample) shown.

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Abstract

The invention relates to an NdCa4O(BO3)3 crystal zero frequency temperature coefficient cut and application. A crystal rotates with an alpha angle and is recorded as (ZXw) alpha, wherein alpha is no less than 20 degrees below zero and no more than 45 degrees; and the dimensional proportion of the cut is shown that thickness:width:length=1:(2-3):(6-10). Platinum electrode is plated on an NdCa4O(BO3)3 crystal cut in the width direction with the electrode thickness of 200-220nm; and by adopting a mode of width shearing vibration, the temperature stability of a crystal resonant frequency is controlled to be 0-25ppm / DEG C within a range from 140 DEG C below zero to 200 DEG C. The invention solves the problems of lower electromechanical coupling coefficient (smaller than 8 percent) of quartz crystals as well as stable crystal frequency and narrower range of crystals of lithium tantalate, lanthanum galium silicate single and the like and is suitable for manufacturing a frequency controller used in a wide temperature range.

Description

technical field [0001] The invention relates to a piezoelectric crystal NdCa 4 O(BO 3 ) 3 The crystal zero-frequency temperature coefficient cutting type and its application belong to the technical field of frequency control. Background technique [0002] Quartz crystal has excellent piezoelectric properties and is widely used in radio frequency control devices (oscillators, resonators) and selection devices (filters), and is a key component in electronic equipment, telemetry navigation and communication systems. The current zero-temperature-compensated piezoelectric crystals for frequency control are mostly quartz crystals, and the temperature range is generally -40-100°C. But the piezoelectric coefficient of quartz crystal is low (d 11 <4pC / N), the electromechanical coupling coefficient is low (<8%), which can no longer meet the development of modern electronic communication technology and the development of sensing technology. People urgently need new crystals w...

Claims

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Application Information

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IPC IPC(8): H03H3/04
Inventor 袁多荣于法鹏张树君潘立虎尹鑫郭世义段秀兰赵显
Owner 山东本源晶体科技有限公司
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