Tongda TD-3500 Powder X-ray Diffractometer

Overview

The Tongda TD-3500 Powder X-ray Diffractometer is a floor-standing, laboratory-grade analytical instrument engineered for precision crystallographic characterization of solid-state materials. It operates on the fundamental principle of Bragg diffraction—where monochromatic X-rays interact with periodic atomic lattices to produce intensity maxima at angles satisfying nλ = 2d sinθ—enabling quantitative determination of crystalline phase composition, lattice parameters, preferred orientation (texture), residual stress (macro- and micro-scale), crystallite size (via Scherrer analysis), and degree of crystallinity. Designed for routine QC/QA, academic research, and industrial R&D environments, the TD-3500 delivers high reproducibility in powder diffraction measurements across diverse sample forms including free-flowing powders, pressed pellets, bulk metals, thin films, and polycrystalline ceramics. Its robust mechanical architecture, combined with closed-loop goniometric control and traceable angular metrology, ensures long-term measurement stability under continuous operation.

Key Features

• High-precision goniometer featuring hollow-shaft construction (patented design, ZL201410301527.8) and full-closed-loop vector servo drive with 32-bit RISC microprocessor and magnetic encoder feedback—achieving angular repeatability of ±0.0001° and minimum step resolution of 0.0001°
• Siemens S7-series programmable logic controller (PLC) integrated into all critical subsystems—including X-ray tube conditioning, high-voltage ramping, shutter actuation, and detector synchronization—ensuring deterministic timing, low failure rate, and immunity to electromagnetic interference (EMI)
• True-color industrial touchscreen HMI with animated system diagnostics, real-time status visualization (tube voltage/current, shutter position, detector count rate, temperature), and intuitive workflow navigation
• Dual-safety interlock system: mechanical lead door physically linked to X-ray shutter; automatic beam termination upon door opening per IEC 61223-3-2 and GBZ 126–2011 radiation safety requirements
• Modular hardware platform supporting field-upgradable configurations—e.g., addition of micro-diffraction stages, automated sample changers, or high-temperature stages—without hardware rewiring
• Flexible source options: selectable X-ray tubes (glass, corrugated ceramic, or metal-ceramic anodes) and high-voltage generators (high-frequency solid-state or line-frequency) to optimize for flux, stability, or lifetime requirements

Sample Compatibility & Compliance

The TD-3500 accommodates standard 25 mm and 50 mm diameter sample holders for powders, as well as custom fixtures for irregular solids, thin films (100 µm), and metallurgical cross-sections. Sample alignment is supported by motorized height/lateral adjustment and laser-assisted positioning. The system complies with international radiation safety standards including IEC 61010-1 (Safety Requirements for Electrical Equipment), IEC 61223-3-2 (Acceptance Tests for Radiological Equipment), and Chinese national standard GBZ 126–2011. For regulated environments, audit-trail-capable data acquisition modes align with GLP/GMP documentation practices; raw 2θ-intensity datasets are stored in vendor-neutral ASCII or CIF-compliant formats suitable for third-party refinement (e.g., TOPAS, FullProf, GSAS-II). While not pre-certified for FDA 21 CFR Part 11, the system supports integration with validated LIMS via TCP/IP or RS-232 interfaces.

Software & Data Management

Instrument control and data acquisition are managed through Tongda’s proprietary TD-Soft suite, compatible with Windows 10/11 (64-bit). Core functionalities include automated scan parameter scripting, live background subtraction, peak search with FWHM-based filtering, phase identification via ICDD PDF-4+ database integration (license optional), Rietveld refinement-ready output, and crystallite size/strain analysis using Williamson-Hall or Warren-Averbach methods. All raw scans retain timestamped metadata (tube settings, slit configuration, detector type, ambient temperature/humidity if sensor-equipped). Data export supports CSV, XYE, and CIF formats. Software architecture permits user-defined report templates compliant with ISO 17025 reporting guidelines. Remote monitoring and diagnostic logging are enabled via Ethernet, supporting centralized lab management protocols.

Applications

• Pharmaceutical solid-form screening: polymorph identification, hydrate/anhydrate differentiation, and excipient compatibility studies
• Advanced materials development: Li-ion cathode/anode phase evolution during cycling, perovskite solar cell film crystallinity optimization, and MOF structural stability assessment
• Geological and mining QA: rapid mineralogical quantification (e.g., quartz/feldspar/clay ratios) in drill core samples
• Metallurgy: residual stress mapping in welded joints, texture analysis of rolled aluminum alloys, and grain-size distribution in sintered components
• Quality control in ceramics and cement: clinker phase quantification (alite/belite), sulfate content estimation, and hydration product tracking
• Akademic research: in situ/operando diffraction experiments (with external furnace or environmental cell integration)

FAQ

What X-ray tube options are available for the TD-3500, and how do they affect performance?
The TD-3500 supports glass, corrugated ceramic, and metal-ceramic X-ray tubes. Metal-ceramic tubes offer superior thermal conductivity and longer operational lifetimes (>5,000 h typical), while glass tubes provide cost-effective entry-level performance. Ceramic variants balance vacuum integrity and power loading for medium-throughput labs.
Is the TD-3500 compatible with third-party Rietveld refinement software?
Yes—raw diffraction patterns are exported in ASCII XYE format with calibrated 2θ and intensity columns, fully compatible with TOPAS, GSAS-II, FullProf, and MATCH! databases.
Does the system support automated sample changers?
The modular design includes standardized mechanical and electrical interfaces for OEM-integrated XYZ robotic sample changers (up to 36 positions); firmware support requires optional TD-Soft Advanced Automation module.
How is angular calibration verified and maintained?
Calibration is traceable to NIST SRM 640e silicon standard. Built-in auto-calibration routines execute at user-defined intervals or after thermal stabilization, correcting for thermal drift using encoder feedback and reference peak indexing.
Can the TD-3500 perform thin-film grazing-incidence XRD (GIXRD)?
Yes—when equipped with incident-beam optics (optional parallel or Göbel mirror), the system achieves incidence angles from 0.1° to 5.0°, enabling depth-resolved phase analysis of layered structures down to ~5 nm penetration depth.