Thermo Fisher ARL X’TRA Powder X-ray Diffractometer

Overview

The Thermo Fisher ARL X’TRA is a high-performance, vertically configured powder X-ray diffractometer engineered for precision phase identification, quantitative crystalline analysis, and structural characterization across academic, pharmaceutical, materials science, and industrial R&D laboratories. Based on Bragg’s law and utilizing Cu Kα radiation (λ = 1.5418 Å), the system employs a robust θ:θ goniometer geometry to enable accurate measurement of diffraction angles (2θ) from 0.5° to 160°, supporting both conventional and low-angle scattering applications—including thin-film grazing-incidence (GIXRD) and small-angle X-ray scattering (SAXS)-compatible configurations. Its design integrates over 25 years of Thermo Fisher’s XRD engineering heritage, emphasizing mechanical stability, optical fidelity, and long-term calibration reproducibility—critical for GLP-compliant workflows and longitudinal studies requiring inter-laboratory comparability.

Key Features

• Vertical θ:θ goniometer architecture facilitating rapid sample exchange, simplified powder mounting, and compatibility with specialized holders (e.g., capillary, HT/LT stages, humidity cells)
• Optimized X-ray optics featuring motorized, micrometer-controlled variable slits and dual Soller slits for independent adjustment of incident and diffracted beam divergence—enabling resolution tuning without hardware reconfiguration
• High-resolution detection via optional Peltier-cooled Si(Li) solid-state detector, delivering energy-dispersive discrimination that eliminates Kβ radiation and fluorescent background without monochromators or β-filters—resulting in higher net peak intensity and improved signal-to-noise ratio compared to scintillation detectors
• Modular sample stage interface supporting ambient, heating (up to 1200 °C), cooling (down to –180 °C), and environmental control options for in situ and operando experiments
• Rigorous mechanical alignment and thermal mass design minimizing drift during extended acquisitions (e.g., time-resolved or high-resolution scans)

Sample Compatibility & Compliance

The ARL X’TRA accommodates standard 25 mm and 32 mm powder sample holders, as well as custom geometries including transmission cells, reflection plates, and micro-diffraction stages. It supports compliance with ASTM E975 (Standard Practice for X-ray Diffraction Analysis of Metals), ISO 21384-2 (XRD for cementitious materials), and USP (Powder X-ray Diffraction for Pharmaceutical Polymorph Screening). Data acquisition and processing meet audit-trail requirements per FDA 21 CFR Part 11 when deployed with validated WinXRD software configurations under controlled IT infrastructure. System validation documentation—including IQ/OQ protocols—is available for GMP-regulated environments.

Software & Data Management

Controlled by WinXRD—a native 32-bit Windows NT/XP/7-compatible application—the platform delivers integrated data collection, real-time visualization, Rietveld refinement (via embedded FullProf engine), PDF-4+ database searching, and crystallite size/strain analysis (Scherrer, Williamson-Hall). Raw data are stored in industry-standard formats (e.g., .raw, .udf, .xye) ensuring interoperability with third-party tools such as TOPAS, GSAS-II, and HighScore Plus. The software supports batch processing, macro scripting, and automated report generation compliant with laboratory information management systems (LIMS). Audit trails record user actions, parameter changes, and calibration events with timestamps and operator IDs.

Applications

• Quantitative phase analysis (QPA) of multi-component mixtures using internal standard or Rietveld methods without reference standards
• Polymorph screening and stability assessment in pharmaceutical development per ICH Q5A and Q6A guidelines
• Crystallinity index determination in polymers, catalysts, and battery electrode materials
• In situ thermal analysis (HT-XRD) for phase transition mapping in ceramics and metallurgical alloys
• Thin-film texture and strain evaluation in semiconductor and optical coating R&D
• Mineralogical quantification in geoscience and mining QA/QC workflows

FAQ

Does the ARL X’TRA support automated sample changers?
Yes—optional XYZ robotic sample changers accommodate up to 48 standard holders and integrate seamlessly with WinXRD scheduling functions.
Is the Si(Li) detector compatible with synchrotron beamlines?
No—the detector is optimized for laboratory-based sealed-tube X-ray sources; synchrotron applications require cryogenically cooled silicon drift detectors (SDD) or pixel array detectors.
Can Rietveld refinement be performed without proprietary software?
Yes—raw data exported in CIF or .xye format are fully compatible with open-source packages including GSAS-II and BGMN.
What is the minimum detectable crystallite size using Scherrer analysis on this system?
Under optimal conditions (high-intensity Cu Kα, narrow slits, Si(Li) detection), theoretical resolution supports crystallite size estimation down to ~3 nm, subject to sample homogeneity and instrumental broadening correction.
Is firmware update support included post-warranty?
Thermo Fisher provides firmware updates and security patches for registered instruments under active service contracts or extended warranty agreements.