High Phase Stability Research Articles

Phase Engineering of Transition Metal Dichalcogenides with Unprecedentedly High Phase Purity, Stability, and Scalability via Molten-Metal-Assisted Intercalation.

The crystalline phase of layered transition metal dichalcogenides (TMDs) directly determines their material property. The most thermodynamically stable phase structures in TMDs are the semiconducting 2H and metastable metallic 1T phases. To overcome the low phase purity and instability of 1T-TMDs, which limits the utilization of their intrinsic properties, various synthesis strategies for 1T-TMDs have been proposed in phase-engineering studies. Herein, a facile and scalable synthesis of 1T-phase molybdenum disulfide (MoS2 ) via the molten-metal-assisted intercalation (MMI) approach is introduced, which exploits the capillary action of molten potassium and the difference between the electron affinity of MoS2 and the ionization potential of potassium. Highly reactive molten potassium metal can readily intercalate into the MoS2 interlayers, inducing an efficient phase transition from the 2H to 1T crystal structure. The ionic bonding between the intercalated potassium and sulfur lowers the energy barrier of the 1T-phase transition, enhancing the phase stability of the 1T crystals. Owing to the high purity and stability of the 1T phase, the electrocatalytic performance for the hydrogen evolution reaction is significantly higher in 1T-MoS2 (MMI) than in 2H-MoS2 and even in 1T-MoS2 synthesized using n-butyllithium.

Thermal Barrier Coatings Based on ZrO2 Solid Solutions

The standard material of the ceramic layer in thermal barrier coatings (TBCs)—a solid solution of ZrO2 stabilized with (6–8 wt.%) Y2O3 (YSZ)—approaches the temperature limit of its application (<1200°C) because the ZrO2 t′ phase sinters and undergoes t′-ZrO2 → T-ZrO2 + F-ZrO2 phase transformations to form M-ZrO2 at elevated temperatures. Ceramic materials for a new generation of TBCs need to be developed to increase the operating temperature (up to 1600°C), efficiency, and productivity of gas-turbine engines. The overview paper analyzes research efforts focusing on the development of TBCs using solid solutions of ZrO2 with rare-earth metal and titanium oxides. When Y2O3 in YSZ is partially substituted by CeO2, TiO2, La2O3, Sc2O3, Gd2O3, Nd2O3, Yb2O3, Er2O3, and Ta2O5, ceramics with high phase stability (ZrO2 t′ phase being retained in the coating) up to 1500°C, lower thermal conductivity, and required fracture toughness and sintering resistance but shorter thermal fatigue life than that of standard YSZ are produced. The concepts of greater tetragonality of the ZrO2 t′ phase (ceramics in the ZrO2–CeO2–TiO2 system) and a ‘multicomponent defective cluster’ (ceramics in the ZrO2–Y2O3–Nd2O3 (Gd2O3, Sm2O3)–Yb2O3 (Sc2O3) system) explain how the operating temperature of the TBC ceramic layer increases to 1350°C and 1600°C, respectively. The thermal conductivity of TBC ceramics in the binary ZrO2–CeO2, ZrO2–Er2O3, ZrO2–Sm2O3, ZrO2–Nd2O3, ZrO2–Gd2O3, ZrO2–Dy2O3, and ZrO2–Yb2O3 systems is lower than that of YSZ. Ceramics with high phase stability and low thermal conductivity have been produced in the ternary ZrO2–Sc2O3–Gd2O3, ZrO2–CeO2–Gd2O3, ZrO2–YbO1.5–TaO2.5, and ZrO2–Yb2O3–TiO2 systems. An integrated approach is needed to choose the composition of the ceramic layer based on the ZrO2 solid solution, select the coating technique, and improve the coating architecture to design effective TBCs with balanced properties.

Irradiation damage in (Zr0.25Ta0.25Nb0.25Ti0.25)C high-entropy carbide ceramics

This research revealed the mechanisms of irradiation damage in the novel high entropy ceramic materials. (Zr0.25Ta0.25Nb0.25Ti0.25)C high-entropy carbide ceramics (HECC) with a single-phase rock-salt structure was synthesized by spark plasma sintering, which was irradiated by 3 MeV Zr ions to 20 dpa at 25, 300, and 500 °C. X-ray diffraction analysis showed that (Zr0.25Ta0.25Nb0.25Ti0.25)C maintained a high phase stability without phase transformation after irradiation. About 0.2% lattice parameter expansion was revealed. The irradiation-induced microstructures were comprised of defect clusters with diameters of several nanometers, without void formation or radiation-induced segregation. The defect clusters were characterized by transmission electron microscopy as two types of dislocation loops, including perfect loops with Burgers vectors of b = a/2<1 1 0> and faulted Frank loops with Burgers vectors of b = a/3<1 1 1>. The growth of dislocation loops may be suppressed by the strong local lattice distortion. Nanoindentation tests showed irradiation-induced hardness increase, which was possibly caused by dislocation loops and lattice strain. Overall, the high irradiation resistance, along with other excellent physical properties makes HECC promising structural materials for advanced reactor designs.

Solar Cells: High Phase Stability in CsPbI3 Enabled by Pb–I Octahedra Anchors for Efficient Inorganic Perovskite Photovoltaics (Adv. Mater. 24/2020)

CsPbI3, with its excellent chemical stability, possesses a suitable bandgap for single-junction and tandem solar cells, yet the poor phase stability hinders its application. In article 2000186, Wan-Jian Yin, Wallace C. H. Choy, and co-workers reveal the nature of the photoactive CsPbI3 phase transition from the perspective of PbI6 octahedral rotation and develop a facile method to simultaneously stabilize the photoactive phase and reduce the defect density of the CsPbI3.

Distribution of optical-comb-based multi-frequency microwave signals over 100 km optical fiber with high phase stability.

We demonstrate a long-distance multi-frequency microwave distribution system over an optical fiber link with high phase stability based on transferring an optical frequency comb (OFC). The phase fluctuation induced by the transmission link variations is detected by applying a reference OFC and is then compensated with the proposed optical voltage-controlled oscillator (OVCO) by adjusting the phase of the repetition rate of the transmitted OFC. By applying the OVCO, we perform the OFC-based multi-frequency microwave distribution over a 100 km standard single-mode fiber. The performance of the transmission system can be exhibited by evaluating the repetition rate (10.015 GHz) and second harmonic frequency (20.03 GHz) signals achieved at the remote end. The residual phase noise of the 10.015 GHz and 20.03 GHz signal is -64 dBc/Hz and -58 dBc/Hz at 1 Hz frequency offset from the carrier, respectively. The fractional frequency instability is 1.4×10-16 and 2.4×10-16 at 10000 s averaging time, respectively. And the timing jitter in the frequency range from 0.01 Hz to 1 MHz reaches 88 fs and 87 fs, respectively. Based on the phase-locked loop theory, we conduct a simulation model of the transmission system and the simulated results match well with experiments. It shows that by detecting the phase fluctuation with higher harmonic frequency signals in the simulation system, the performance of the transmission system can be further improved.

High Phase Stability in CsPbI3 Enabled by Pb-I Octahedra Anchors for Efficient Inorganic Perovskite Photovoltaics.

CsPbI3 inorganic perovskite has exhibited some special properties particularly crystal structure distortion and quantum confinement effect, yet the poor phase stability of CsPbI3 severely hinders its applications. Herein, the nature of the photoactive CsPbI3 phase transition from the perspective of PbI6 octahedra is revealed. A facile method is also developed to stabilize the photoactive phase and to reduce the defect density of CsPbI3 . CsPbI3 is decorated with multifunctional 4-aminobenzoic acid (ABA), and steric neostigmine bromide (NGBr) is subsequently used to further mediate the thin films' surface (NGBr-CsPbI3 (ABA)). The ABA or NG cation adsorbed onto the grain boundaries/surface of CsPbI3 anchors the PbI6 octahedra via increasing the energy barriers of octahedral rotation, which maintains the continuous array of corner-sharing PbI6 octahedra and kinetically stabilizes the photoactive phase CsPbI3 . Moreover, the added ABA and NGBr not only interact with shallow- or deep-level defects in CsPbI3 to significantly reduce defect density, but also lead to improved energy-level alignment at the interfaces between the CsPbI3 and the charge transport layers. Finally, the champion NGBr-CsPbI3 (ABA)-based inorganic perovskite solar cell delivers 18.27% efficiency with excellent stability. Overall, this work demonstrates a promising concept to achieve highly phase-stabilized inorganic perovskite with suppressed defect density for promoting its optoelectronic applications.

Ultrahigh-sensitive optical coherence elastography

The phase stability of an optical coherence elastography (OCE) system is the key determining factor for achieving a precise elasticity measurement, and it can be affected by the signal-to-noise ratio (SNR), timing jitters in the signal acquisition process, and fluctuations in the optical path difference (OPD) between the sample and reference arms. In this study, we developed an OCE system based on swept-source optical coherence tomography (SS-OCT) with a common-path configuration (SS-OCECP). Our system has a phase stability of 4.2 mrad without external stabilization or extensive post-processing, such as averaging. This phase stability allows us to detect a displacement as small as ~300 pm. A common-path interferometer was incorporated by integrating a 3-mm wedged window into the SS-OCT system to provide intrinsic compensation for polarization and dispersion mismatch, as well as to minimize phase fluctuations caused by the OPD variation. The wedged window generates two reference signals that produce two OCT images, allowing for averaging to improve the SNR. Furthermore, the electrical components are optimized to minimize the timing jitters and prevent edge collisions by adjusting the delays between the trigger, k-clock, and signal, utilizing a high-speed waveform digitizer, and incorporating a high-bandwidth balanced photodetector. We validated the SS-OCECP performance in a tissue-mimicking phantom and an in vivo rabbit model, and the results demonstrated a significantly improved phase stability compared to that of the conventional SS-OCE. To the best of our knowledge, we demonstrated the first SS-OCECP system, which possesses high-phase stability and can be utilized to significantly improve the sensitivity of elastography.

High temperature mechanical and thermal properties of CaxBa1-xZrO3 solid solutions

The excellent high temperature phase stability enables the perovskite BaZrO3 to be a promising candidate for thermal barrier coatings (TBCs). Further improvement of its thermo-physical properties is necessary to fulfill the increasing requirements for TBCs. In this work, CaxBa1-xZrO3 (x = 0.05, 0.10, 0.15, 0.20, 0.25) solid solutions are fabricated and the influence of the Ca2+ content on their mechanical/thermal properties is studied. They have moderate mechanical properties and their residual Young's moduli at 1473 K are around 80% of the values at room temperature. Compared with BaZrO3, CaxBa1-xZrO3 solid solutions have decreased thermal conductivities which are comparable to those of YSZ and other potential TBCs materials. Among these solid solutions, Ca0.25Ba0.75ZrO3 exhibits the lowest thermal conductivity that is in the range from 2.06 W⋅m-1⋅K-1 to 2.52 W⋅m-1⋅K-1. Meanwhile, CaxBa1-xZrO3 solid solutions have higher thermal expansion coefficients than that of BaZrO3. These good high temperature mechanical and thermal properties reveal their promising applications as high temperature structural ceramics including TBCs.

A comparative study of the mechanical integrity of natural hydroxyapatite scaffolds prepared from two biogenic sources using a low compaction pressure method

With a view to enhancing laboratory and application-based pedagogical approaches in bioengineering, a comparison of the physical, chemical and mechanical properties of natural hydroxyapatite produced from non-separated animal bones (NB) and catfish bones (CB) obtained by thermal treatment and a low compaction pressure method has been reported in this study. The structure, morphology and surface chemistry of the processed biomaterials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and infrared spectroscopy, respectively. Uniaxial compaction using a pressure of 1 MPa was used on circular shaped hydroxyapatite scaffolds to measure the mechanical properties of the produced scaffolds. From XRD analysis, both samples showed prominent reflections of the hydroxyapatite phase, suggesting high crystallinity and phase stability. The morphology of the powders showed irregular shapes with large agglomerates for non-separated animal bones-derived hydroxyapatite as compared to more open pores in the catfish bones-derived hydroxyapatite. Hydroxyapatite produced from catfish bones revealed a microstructure with open pores which is useful in terms of cell adhesion. The hydroxyapatite products revealed Ca/P ratios of 1.58 and 1.63 for catfish bones (CB) and non-separated animal bones-derived hydroxyapatite, respectively. Improvements in the fracture toughness were observed for CB in comparison with NB. Calculated fracture toughness values were 5.72 MPa.m1/2 and 2.35 MPa.m1/2 for catfish bones and non-separated animal bones-derived scaffold respectively. These results are useful in terms of the production and biomedical applications of natural hydroxyapatite.

Microstructural and transport properties of Mg doped CuFeO2 thin films: A promising material for high accuracy miniaturized temperature sensors based on the Seebeck effect

Delafossite type Mg doped CuFeO2 thin films have been deposited on fused silica by radio-frequency magnetron sputtering. As-deposited 300 nm thick films have been obtained and post-annealed between 350 and 750 °C under primary vacuum. The delafossite structure appears for the samples annealed above 550 °C. The microstructural analysis showed the presence of cracks and an inhomogeneous distribution of the dopant in the thickness. Only the sample annealed at 700 °C showed CuFeO2 stable phases, lower impurities amount, a high and constant Seebeck coefficient (+416 ±3 μV K−1) and good electrical conductivity (1.08 S cm−1 at 25 °C). High accuracy temperature sensors based on the Seebeck effect not only need high Seebeck coefficient without any drift with the temperature, but also a sufficient electrical conductivity and high phase stability. Thanks to its properties and also its low thermal conductivity (4.8 ±0.6 W m−1K−1 at 25 °C) due to the thin film configuration and the polaronic transport, the Mg doped CuFeO2 thin film annealed at 700 °C was found to be a very good p-type material for high accuracy miniaturized temperature measurement sensors based on the Seebeck effect in the medium temperature range.

Common-path multimodal three-dimensional fluorescence and phase imaging system.

.A stable multimodal system is developed by combining two common-path digital holographic microscopes (DHMs): coherent and incoherent, for simultaneous recording and retrieval of three-dimensional (3-D) phase and 3-D fluorescence imaging (FI), respectively, of a biological specimen. The 3-D FI is realized by a single-shot common-path off-axis fluorescent DHM developed recently by our group. In addition, we accomplish, the phase imaging by another single-shot, highly stable common-path off-axis DHM based on a beam splitter. In this DHM configuration, a beam splitter is used to divide the incoming object beam into two beams. One beam serves as the object beam carrying the useful information of the object under study, whereas another beam is spatially filtered at its Fourier plane by using a pinhole and it serves as a reference beam. This DHM setup, owing to a common-path geometry, is less vibration-sensitive and compact, having a similar field of view but with high temporal phase stability in comparison to a two-beam Mach–Zehnder-type DHM. The performance of the proposed common-path DHM and the multimodal system is verified by conducting various experiments on fluorescent microspheres and fluorescent protein-labeled living cells of the moss Physcomitrella patens. Moreover, the potential capability of the proposed multimodal system for 3-D live fluorescence and phase imaging of the fluorescent beads is also demonstrated. The obtained experimental results corroborate the feasibility of the proposed multimodal system and indicate its potential applications for the analysis of functional and structural behaviors of a biological specimen and enhancement of the understanding of physiological mechanisms and various biological diseases.

Cesium Lead Halide Perovskite Nanocrystals Prepared by Anion Exchange for Light-Emitting Diodes

Cesium lead halide perovskite nanocrystals (NCs) have emerged as a promising emitter for lighting and display technologies. However, the iodide-containing CsPb(Br/I)3 and CsPbI3 NCs suffer from chemical and phase degradation to nonfunctional orthorhombic (δ) phase. To address this challenge, we developed a facile synthetic protocol for halide exchange in pristine CsPbBr3 NCs. The protocol involves change in the nucleophilicity (or basicity) of the halide ions in aqueous–organic media which acts as the driving force to facilitate the halide exchange. Our method avoids the use of additives for anion solubilization, which otherwise induces chemical instability and quench the emission. The halide-exchanged CsPb(Br/I)3 and CsPbI3 NCs showed enhanced structural and optical properties, such as high phase stability and emission quantum yields up to 94.2%, as compared to the NCs (of same composition) obtained from direct synthesis. In addition, we demonstrated fabrication of light-emitting diodes (LED) based on ha...

Axially Chiral Spiro-Conjugated Carbon-Bridged p-Phenylenevinylene Congeners: Synthetic Design and Materials Properties

Spiro-conjugated systems are attracting considerable interest for their chiroptical properties and because of their compact structure the small reorganization energy upon electronic excitation or ionization. We report here a modular and convergent synthesis of axially chiral spiro-conjugated carbon-bridged p-phenylenevinylenes (spiro-CPVs) in a racemic and optically active form where two carbon-bridged p-phenylenevinylene molecules are connected by a spiro carbon atom. Our synthetic design focuses on the C2 symmetry of the spiro-CPV molecules, relying on coupling of two 3-lithio-2-arylindene molecules on a carbon monooxide molecule that serves as the spiro carbon center in the target molecule. We prepared derivatives including those possessing phenol groups that facilitate optical resolution and also serve as a platform for the synthesis of a variety of optically active derivatives, which exhibit circularly polarized photoluminescence with high fluorescence quantum yields, large dissymmetry factors, and high photostability. For example, a bis(phenylethynyl) derivative exhibited a fluorescence quantum yield of 0.99 and a dissymmetry factor in luminescence of |glum| = 2.7 × 10-4, values highest among and comparable to those of reported CPL compounds, respectively. A tetrakis-diarylamine derivative shows hole mobility (μh = 3.84 × 10-5 cm2 V-1 s-1; space charge-limited current measurement of a spin-coated film) comparable to that of a popularly used hole-transporting material, spiro-OMeTAD (μh = 2.6 × 10-5 cm2 V-1 s-1), as well as high thermal and phase stability (T5d = 382 °C, Tg = 171 °C).

Size and morphology effects on the high pressure behaviors of Mn3O4 nanorods.

The high-pressure behaviors of Mn3O4 nanorods were studied by high pressure powder synchrotron X-ray diffraction and Raman spectroscopy. We found that the initial hausmannite phase transforms into the orthorhombic CaTi2O4-type structure, and then to the marokite-like phase upon compression. Upon decompression, the marokite-like phase is retained at the ambient pressure. Compared with Mn3O4 bulk and nanoparticles, Mn3O4 nanorods show obviously different phase transition behaviors. Upon compression, the phase transition sequence of Mn3O4 nanorods is similar with the nanoparticles, while the decompression behavior is consistent with the bulk counterparts. The hausmannite phase shows higher stability and smaller bulk modulus in Mn3O4 nanorods than those of the corresponding bulk and nanoparticles. We proposed that the higher phase stability and compressibility of the nanorods are concerned with their nanosize effects and the rod morphology. Both the growth orientation and the suppressed Jahn–Teller distortion of the Mn3O4 nanorods are crucial factors for their high pressure behaviors.

Effect of Yb2O3 stabilizing impurity on the structure and properties of (ZrO2)0.9-x(Sc2O3)0.1(Yb2O3)x crystals

The effect of introduction of 0.5 – 2 mol.% Yb2O3 additional doping oxide into ZrO2 – 10 mol.% Sc2O3 solid solutions on the phase composition, structure and electrophysical properties has been studied. ZrO2 stabilization due to the joint effect of 10 mol.% Sc2O3 and 2 mol.% Yb2O3 provides for the formation of transparent homogeneous crystals with a cubic structure having high phase stability. Mechanical grinding of the crystals has not changed their phase composition, the powders retaining the initial fluorite crystalline structure. We show that the high-temperature electrical conductivity of the crystals decreases with an increase in the Yb2O3 concentration.

Exploration of pressure induced phase transitions and thermo-mechanical properties in LuX (X=As, Sb, Bi)

This paper reports the detailed first-principle calculations carried out to investigate the high pressure structural phase stability of lutetium pnictides (LuX, where X = As, Sb and Bi) up to 200 GPa. All of these compounds crystallize in the rocksalt type structure (B1 phase) at ambient condition. In LuAs our calculations suggest the occurrence of orthorhombic structure (Cmcm space group) at ∼ 53 GPa, which is close to the experimentally reported transition pressure of ∼57 GPa to an unresolved structure. This orthorhombic phase further transforms to a tetragonal structure (space group I4/amd) at ∼ 67 GPa. In LuSb and LuBi, B1 phase directly transforms to I4/amd structure at ∼20 GPa and ∼17 GPa, respectively. Upon further compression, in case of LuAs and LuSb, the I4/amd phase remains stable up to 200 GPa, however, in LuBi this tetragonal phase transforms to another tetragonal structure (space group P4/mmm). Also, using quasi-harmonic approximation, the temperature variation of various thermo-physical quantities, namely, bulk modulus, volume, volume thermal expansion coefficient, heat capacity, and Gruneisen parameter of these compounds for the ambient B1 phase have been determined in the present study.

Effects of Powder Structure and Size on Gd2O3 Preferential Vaporization During Plasma Spraying of Gd2Zr2O7

Complex rare-earth oxide ceramics with pyrochlore structure (A2B2O7) are considered as promising candidate materials for next generation thermal barrier coatings (TBCs) due to low thermal conductivity and high phase stability. During plasma spraying, the component with a higher vapor pressure would experience preferential vaporization. In this study, Gd2Zr2O7 (GZO) powders with a hollow spherical structure in a wide range of particle size distribution were used to examine the preferential vaporization behavior of Gd2O3 during plasma spraying. Individual GZO splats were deposited to study the effect of particle size on Gd vaporization loss. The results show that almost all particles experienced Gd preferential vaporization loss that increased remarkably with the decrease in particle size. The Gd vaporization loss was significantly suppressed only when the particle size of molten droplet was larger than about 35 μm. The relationship between the Gd/Zr ratio and the droplet size reveals the significant effects of particle size and powder structure on Gd vaporization loss. It is clear that the vaporization behavior of in-flight GZO particles is dominated by molten droplet size rather than the size of feedstock powders with a porous hollow structure. The particle size effect on Gd vaporization resulted in wide distributions of Gd/Zr ratio in plasma-sprayed GZO coatings. Furthermore, it is found that after annealing at 1300 °C, the vaporization loss of Gd led to the formation of monoclinic ZrO2 from metastable pyrochlore phase in GZO coatings with inhomogeneous chemical composition.

Zirconia based pyrochlore thermal barrier coatings

Improvements in thermal barrier coatings (TBCs) technology, further than what is already in service to enable adequate protection to metallic components from higher (>1100°C) operating temperatures requires newer developments in materials. Many research activities have been undertaken by scientists to seek alternatives after discovering the threshold of Yttria-stabilized zirconia (YSZ) TBCs on standard aero-space materials at elevated temperatures. To increase the thermal performance of gas turbine engines, alternate TBC materials with better sintering resistance and lower thermal conductivity are required. One of the promising candidates for the TBCs is Pyrochlore-type rare earth zirconium oxides (Re2Zr2O7, Re = rare earth). Re2Zr2O7 TBCs have higher phase stability, lower thermal conductivity, lower sintering rate, no phase transformation, and lower coefficient of thermal expansion at elevated temperatures when compared with YSZ. In this work, plasma spray powders of Lanthanum Zirconate (La2Zr2O7) and Lanthanum Ceria Zirconate (La2 (Zr0.7Ce0.3)2O7) were synthesized by the solid-state reaction method with the goal to develop pyrochlore oxide-based coatings with desired properties at high temperatures (>1200°C), better than the YSZ TBCs: currently the most popular choice for TBCs. These TBCs are expected to increase gas turbine efficiencies while protecting the underlying metallic substrate at high operation temperatures. The evaluation of the synthesised TBCs has been carrying out by studying their performances at 1200°C. Results of evaluation for phase composition by employing X-Ray Diffractometry (XRD), microstructure via Scanning electron Microscope (SEM) and chemical composition via Energy Dispersive spectroscopy (EDS) also have been included.

A high phase stability transmitter clock domain design

Satellite microwave communication transmitters mainly evaluate the transmitted signal quality through EVM indicator. In this paper, we used the mathematical derivation result between phase noise and signal EVM, then proposed a high phase stability transmitter clock domain design scheme, based on the design process of a spaceborne transmitter. After testing, compared with the traditional transmitter clock domain, the new transmitter clock domain achieved an 6% increase in the EVM indicators.

An In-Bore Receiver for Magnetic Resonance Imaging.

In magnetic resonance imaging, the use of array detection and the number of detector elements have seen a steady increase over the past two decades. As a result, per-channel analog connection via long coaxial cable, as commonly used, poses an increasing challenge in terms of handling, safety, and coupling among cables. This situation is exacerbated when complementary recording of radiofrequency transmission or NMR-based magnetic field sensing further add to channel counts. A generic way of addressing this trend is the transition to digital signal transmission, enabled by digitization and first-level digital processing close to detector coils and sensors in the magnet bore. The foremost challenge that comes with this approach is to achieve high dynamic range, linearity, and phase stability despite interference by strong static, audiofrequency, and radiofrequency fields. The present work reports implementation of a 16-channel in-bore receiver, performing signal digitization and processing with subsequent optical transmission over fiber. Along with descriptions of the system design and construction, performance evaluation is reported. The resulting device is fully MRI compatible providing practically equal performance and signal quality compared to state-of-the-art RF digitizers operating outside the magnet. Its use is demonstrated by examples of head imaging and magnetic field recording.