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Melilite structure crystal zero/ near-zero frequency temperature coefficient cut and processing method and application thereof

A frequency temperature coefficient, feldspar-type technology, applied in the direction of impedance network, electrical components, etc., can solve the problems of narrow application temperature range and low application temperature

Inactive Publication Date: 2017-03-22
QUFU NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of narrow application temperature range and low application temperature of quartz crystal zero-frequency temperature coefficient cutting type in the prior art, the present invention provides a zero / near-zero frequency temperature coefficient cutting type of piezoelectric crystal with mellow feldspar structure, which can be used in Resonators, oscillators, filters and other devices have a large temperature application range

Method used

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  • Melilite structure crystal zero/ near-zero frequency temperature coefficient cut and processing method and application thereof
  • Melilite structure crystal zero/ near-zero frequency temperature coefficient cut and processing method and application thereof
  • Melilite structure crystal zero/ near-zero frequency temperature coefficient cut and processing method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0096] Embodiment 1: Referring to the above sample processing steps, process SrGdGa 3 o 7 Crystal sample size is 1.5×8×8mm 3 (X×Y×Z) X-cut, and the size is 1.6×3.5×12mm 3 (X×Z×Y) XYt5°, XYt45°, XYt85° strip samples, test their frequency temperature characteristics in the temperature range of 20-600°C, such as image 3 As shown, the study found that the frequency temperature coefficients of X-cut, XYt5°, XYt45°, and XYt85° are -10ppm / °C, -32ppm / °C, -17ppm / °C and -25ppm / °C respectively. The schematic diagram of the zero / near zero frequency temperature compensation cut shape of the sample in the coordinate system is as follows figure 1 shown.

Embodiment 2

[0097] Embodiment 2: Referring to the above-mentioned sample processing steps, process BaLaGa 3 o 7 Crystal ZXt45° strip sample, the size is 1.5×3.6×11.8mm 3 (Z×Y×X), excite length stretching vibration.

[0098] Processing SrLaGa 3 o 7 Crystal XYt45° strip sample, the size is 1.6×3.8×12.0mm 3 (X×Z×Y), excite length stretching vibration.

[0099] Processing SrNdGa 3 o 7 X-cut sample of crystal, sample size is 1.5×7.8×7.8mm 3 (X×Y×Z), excited plane shear vibration.

[0100] In the temperature range of 20-600 °C, the frequency temperature characteristics of the above three cutting types are tested, such as Figure 4 As shown, the study found that BaLaGa 3 o 7 Crystal ZXt45°cut type, SrLaGa 3 o 7 Crystal XYt45°cut type, SrNdGa 3 o 7 The frequency temperature coefficients of X-cut cut crystals are -53, -43, -52ppm / ℃ respectively.

Embodiment 3

[0101] Embodiment 3: with reference to the above-mentioned sample processing steps, process Ca 2 Ga 2 SiO 7 Crystal XYt5° and ZXt45° strip samples, sample size is 1.6×3.5×12mm 3 (X×Z×Y), excite the transverse length stretching vibration.

[0102] Processing Ca 2 MgSi 2 o 7Crystal XYt5° and XYt85°, sample size is 1.4×3.6×11.8mm 3 (X×Z×Y), excite the transverse length stretching vibration.

[0103] Test frequency temperature characteristics in the temperature range of 20-600°C, such as Figure 5 As shown, the study found that Ca 2 Ga 2 SiO 7 Crystal XYt5° cut shape, Ca 2 Ga 2 SiO 7 Crystal ZXt45° cut shape, Ca 2 MgSi 2 o 7 Crystal XYt5° cut shape, Ca 2 MgSi 2 o 7 The frequency temperature coefficients of the crystal XYt85°cut are -21, -43, -25, -24ppm / ℃ respectively. It should be pointed out that, Figure 5 Medium Ca 2 MgSi 2 o 7 The relative frequency of the crystal has an abnormal peak at around 75°C with temperature, which is related to the commensurat...

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Abstract

The invention relates to a melilite structure crystal zero / near-zero frequency temperature coefficient cut and a processing method and application thereof. The melilite structure crystal zero / near-zero frequency temperature coefficient cut adopts a melilite structure piezo-electric crystal, and the general formula of the melilite structure piezo-electric crystal is (A<1>A<2>)2{(B<1>B<2>)(C<1>C<2>)}3O7, wherein A<1>= Ca, Sr, Ba; A<2>= La, Nd, Pr, Sm, Gd; B<1>=Mg, Zn; B<2>=Al, Ga; C<1>=Al, Ga; and C<2>=Si, Ge. The melilite structure crystal zero / near-zero frequency temperature coefficient cut is wide in application temperature range and can be applied within 20-600 DEG C; and frequency-temperature stability can reach -10 ppm / DEG C.

Description

technical field [0001] The invention relates to a zero / near-zero frequency temperature coefficient cutting type of a feldspar-type piezoelectric crystal, a processing method and an application thereof, and belongs to the technical field of frequency selection / control and devices. Background technique [0002] Using the zero / near-zero frequency temperature coefficient cut type of piezoelectric crystals, a variety of frequency selective devices (such as filters) and frequency control devices (such as resonators, oscillators) can be made. It is a key material and has very important applications in systems such as telemetry navigation, military radar and TV satellite receivers. Quartz crystal has a zero-frequency temperature coefficient cut type, and the frequency is very stable with temperature changes. It is widely used in the production of frequency control devices, but the application temperature range of the device is narrow (-40 ~ 100 ° C), and the piezoelectric coefficien...

Claims

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Application Information

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IPC IPC(8): H03H9/19H03H3/04
CPCH03H3/04H03H9/19H03H2003/0407
Inventor 申传英张怀金王继扬王端良王海龙
Owner QUFU NORMAL UNIV
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