JJK Custom Fully-Covered Gold Electrode Quartz Crystal Sensor
Part No：CR5GE
The CR5GE is a 5MHz custom fully-covered gold electrode crystal sensor designed for demanding process environments and extended storage requirements. Its core feature lies in the **Gold/Chromium (Au/Cr)** composite electrode structure, which leverages gold's excellent chemical inertness to completely eliminate oxidation and sulfidation reactions on the electrode surface, achieving true 'unlimited storage.' For the precise 12.42mm dimension, the CR5GE utilizes a high-quality quartz substrate paired with a unique 2-anchor electrode design (2-Anchor), precisely locking the center frequency at 5.001MHz. It is an outstanding choice for precision optical thin films, chemical vapor deposition (CVD), and customized research tasks with stringent oscillation stability requirements.
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CR5GE 5MHz Fully-Covered Gold Custom Sensor: The Ultimate Solution for Chemical Stability
In certain specialized vacuum coating environments, the chemical stability of electrode materials directly determines monitoring success rates. The CR5GE employs high-purity gold electrodes, naturally resisting corrosive components in the atmosphere and residual process gases. Unlike silver electrodes, gold electrodes do not discolor or fail due to prolonged storage or environmental humidity fluctuations. The 5.001MHz slight positive offset center frequency design is a precisely calculated pre-compensation scheme designed to ensure that frequency response rapidly converges to the most stable linear resonance region upon initial heating and minimal film loading. For high-end users seeking 'on-demand use with consistent performance,' the CR5GE provides unparalleled assurance.
Gold-Chromium Composite Electrode Process: The Perfect Combination of Excellent Adhesion and Ultra-Low Impedance
The electrode preparation of the CR5GE is not a simple single-layer deposition. Instead, a nano-scale chromium (Cr) seed layer is first deposited through precision sputtering to enhance molecular-level adhesion between the gold and the quartz substrate, preventing electrode delamination during high-power electron beam evaporation. The outer fully-covered gold film provides ultra-low resonant resistance of ≤15Ω. The 2-anchor (2-Anchor) structure has been force-optimized for the 12.42mm substrate, not only ensuring robust signal transmission but also greatly improving the signal-to-noise ratio of the 5MHz low-frequency crystal in complex processes by reducing parasitic vibrations at the electrode edges.
Deeply Embedded in 12mm Precision Probe Systems, Adapting to High-End Equipment with Custom Precision
The CR5GE strictly adheres to the 12.42mm (±0.03mm) tolerance standard, perfectly fitting Japanese high-end equipment such as Shincron and Optorun, as well as domestic precision 12mm sensors. As a custom product, its AT-CUT process features dynamic frequency compensation optimization for the 25°C to 75°C temperature range, effectively counteracting thermal stress frequency drift caused by temperature rise. The 5MHz substrate, with its physical thickness advantage, demonstrates exceptional crack resistance. The unique surface energy of gold electrodes exhibits outstanding compatibility and data linearity when monitoring special materials such as organic evaporants, sulfides, or fluorides, making it the preferred choice for precision experiments and high-volume production tasks.
CR5GE Technical Specifications
| Part No | CR5GE |
| Nominal Frequency | 5.000MHz |
| Center Frequency | 5.001MHz |
| Frequency Tolerance | ±6KHz@25°C |
| Wafer Diameter | 12.42mm ± 0.03mm |
| Resonance Resistance | ≤15Ω |
| Crystal Cutting | AT-CUT |
| Electrode Material | Gold (Au) / Chromium (Cr) |
| Operating Temperature | 25°C ~ 75°C |
| Electrode Appearance | 2-Anchor Electrode (2 anchors) |
| Storage Temperature | -20°C ~ +85°C |
| Storage Humidity | Relative Humidity 30~50% |
| Storage Life | Unlimited Storage |
applications of the quartz monitor crystal
Find answers to the most frequently asked questions .
This is a precise custom design. 5.001MHz is slightly higher than the nominal value, taking into account the initial load feedback of the gold/chromium electrode in high-vacuum environments. This minor positive offset ensures that when the crystal enters the working state (initial deposition), the frequency rapidly converges to the most stable linear region, providing a more accurate initial rate reference for subsequent film monitoring.
The core advantage is chemical inertness. Gold electrodes do not oxidize and do not react with sulfur in the environment. This not only means the CR5GE has unlimited storage life, but also means it maintains more stable contact resistance than silver electrodes when handling certain chemically active deposition materials or during stages with poorer vacuum conditions, preventing oscillation start-up failure.
The direct adhesion between gold and quartz is relatively weak, making it prone to film delamination during high-power evaporation or thermal stress. Chromium (Cr), as an intermediate transition layer, forms strong chemical bonds with quartz while perfectly bonding with the gold layer, acting as a 'glue' that greatly enhances the durability of the crystal sensor in demanding environments.
Although gold electrodes do not oxidize, we still recommend storage in a 30-50% humidity environment. This is primarily to protect the quartz substrate surface from contamination by organic volatiles in the environment. Unlimited storage means you don't need to worry about scrap due to electrode degradation, greatly reducing inventory risk.
The 2-anchor electrode (also called dual-anchor) provides two symmetrical contact areas. This design not only disperses the mechanical stress of the probe spring contacts on the 12mm crystal, reducing frequency jumping caused by excessive pressure, but also provides redundant paths for signal transmission, ensuring electrical signals remain robust under complex vibration environments.
It is particularly suitable for: 1. Long-term uninterrupted research projects (no frequent crystal changes and low storage requirements); 2. High-value optical film monitoring (such as multi-layer narrow-band filters); 3. Organic material evaporation (OLED) or chemically reactive processes, as well as automated production lines with extremely high resistance stability requirements.