@article{wesley_bellcase_forrester_dickey_reaney_jones_2024, title={Solid state synthesis of BiFeO<sub>3</sub> occurs through the intermediate Bi<sub>25</sub>FeO<sub>39</sub> compound}, volume={2}, ISSN={["1551-2916"]}, url={https://doi.org/10.1111/jace.19702}, DOI={10.1111/jace.19702}, abstractNote={AbstractThe solid‐state synthesis of perovskite BiFeO3 has been a topic of interest for decades. Many studies have reported challenges in the synthesis of BiFeO3 from starting oxides of Bi2O3 and Fe2O3, mainly associated with the development of persistent secondary phases such as Bi25FeO39 (sillenite) and Bi2Fe4O9 (mullite). These secondary phases are thought to be a consequence of unreacted Fe‐rich and Bi‐rich regions, that is, incomplete interdiffusion. In the present work, in situ high‐temperature X‐ray diffraction is used to demonstrate that Bi2O3 first reacts with Fe2O3 to form sillenite Bi25FeO39, which then reacts with the remaining Fe2O3 to form BiFeO3. Therefore, the synthesis of perovskite BiFeO3 is shown to occur via a two‐step reaction sequence with Bi25FeO39 as an intermediate compound. Because Bi25FeO39 and the γ‐Bi2O3 phase are isostructural, it is difficult to discriminate them solely from X‐ray diffraction. Evidence is presented for the existence of the intermediate sillenite Bi25FeO39 using quenching experiments, comparisons between Bi2O3 behavior by itself and in the presence of Fe2O3, and crystal structure examination. With this new information, a proposed reaction pathway from the starting oxides to the product is presented.}, journal={JOURNAL OF THE AMERICAN CERAMIC SOCIETY}, publisher={Wiley}, author={Wesley, Corrado and Bellcase, Leah and Forrester, Jennifer S. and Dickey, Elizabeth C. and Reaney, Ian M. and Jones, Jacob L.}, year={2024}, month={Feb} }
 @article{kosgei_fernando_forrester_alberts_fernando_henderson_weiss jr_2023, title={Exploring the luminescence of tin-incorporated nickel-sensitized lithium gallate short-wave-infrared phosphors}, ISSN={["1551-2916"]}, DOI={10.1111/jace.19260}, abstractNote={AbstractA series of Ni2+‐sensitized LiGa5O8 nanocrystals doped with varying amounts of Sn4+ were synthesized via a high‐temperature solid‐state method. X‐ray diffraction and scanning electron microscopy were employed to investigate the microstructure of the LiGa5O8 host, and optical spectroscopy was used to examine the effects of Sn4+ addition on the emission spectra and persistent luminescence (PersL) properties, which indicated a homogeneous distribution of the constituent elements in the phosphor. The Sn4+ incorporation led to an approximately sixfold enhancement of photoluminescence intensity at room temperature and decrease in the energy transition of Ni2+(3T2(3F)→3A2(3F)), which resulted in ∼65 nm bathochromic shift in the photoluminescence emission maxima. However, the addition of Sn4+ dopant led to a decrease in the quantum yield of luminescence compared to that of the original phosphor. Temperature‐dependent thermoluminescence measurements revealed that doping of LiGa5O8 with Sn4+ interfered with the Ni2+ trap centers. Moreover, Ni2+‐sensitized Sn4+‐doped LiGa5O8 nanocrystals exhibited an afterglow effect that persisted for up to 300 s.}, journal={JOURNAL OF THE AMERICAN CERAMIC SOCIETY}, author={Kosgei, Gilbert K. and Fernando, P. U. Ashvin Iresh and Forrester, Jennifer S. and Alberts, Erik M. and Fernando, Brianna M. and Henderson, David L. and Weiss Jr, Charles A.}, year={2023}, month={Jun} }
 @article{horn_rock_kaoumi_anderson_white_prost_rieken_saptarshi_schoell_dejong_et al._2022, title={Laser powder bed fusion additive manufacturing of oxide dispersion strengthened steel using gas atomized reaction synthesis powder}, volume={216}, ISSN={["1873-4197"]}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85127141491&partnerID=MN8TOARS}, DOI={10.1016/j.matdes.2022.110574}, abstractNote={Mechanically alloyed Fe-based alloys with oxide dispersion strengthening have largely dropped out of the marketplace due to high cost related to problems with complex and unreliable processing. Nevertheless, the desirable properties of oxide dispersion strengthened (ODS) steels have motivated research on alternate processing routes aimed at improving processing simplicity and reliability. Powders produced by gas atomization reaction synthesis (GARS) consist of stable Fe-Y intermetallic phases and a Cr surface oxide layer that acts as a chemical reservoir during solid-state processing and heat treatment to form a high density of nano-scale oxides. This research explores the use of Fe GARS powders, with 15 wt% Cr with micro-alloyed additions of 0.15 wt% Y and 0.10% Ti, in laser powder bed fusion (LPBF) additive manufacturing (AM), and evaluates the effectiveness of oxide dispersoid formation in the liquid melt pool. Additional oxygen was introduced by varying the LPBF chamber atmospheres using Ar, Ar + 1 wt% O, Ar + 5 wt% O, and air. Characterization of LPBF consolidated solids demonstrated the formation of a high density of nano-scale Y-Ti oxides in the build microstructures from the GARS precursor powders.}, journal={MATERIALS & DESIGN}, author={Horn, Timothy and Rock, Christopher and Kaoumi, Djamel and Anderson, Iver and White, Emma and Prost, Tim and Rieken, Joel and Saptarshi, Sourabh and Schoell, Ryan and DeJong, Matt and et al.}, year={2022}, month={Apr} }
 @article{kim_kim_han_lee_ko_park_jang_kim_forrester_lee_et al._2022, title={Ti/TiO2/SiO2 multilayer thin films with enhanced spectral selectivity for optical narrow bandpass filters}, volume={12}, ISSN={["2045-2322"]}, DOI={10.1038/s41598-021-03935-z}, abstractNote={AbstractThin film-based optical sensors have been attracting increasing interest for use in developing technologies such as biometrics. Multilayered dielectric thin films with different refractive indices have been utilized to modulate the optical properties in specific wavelength bands for spectral selectivity of Thin Film Narrow Bandpass Filters (TFNBFs). Progress in TFNBF design has been made with the incorporation of metallic thin films. Narrower bandwidths with higher transmittance have been achieved in specific spectral bands. In this work, Ti/TiO2/SiO2 based multilayer thin films were prepared using pulsed-DC reactive sputtering. Computer simulations using the Essential Macleod Program allowed the optimal number of layers and thickness of the multilayer thin films to be determined to efficiently tailor the optical path transmitting specific wavelength bands. The addition of Ti metal layers within dielectric (TiO2/SiO2) multilayer thin films significantly changes the cutoff frequency of transmittance at specific wavelengths. Representative 26 multilayer films consisting of Ti, TiO2, and SiO2 show lower transmittance of 10.29% at 400 nm and 10.48% at 680 nm. High transmittance of 80.42% at 485 nm was observed, which is expected to improve the spectral selectivity of the TFNBF. This work provides a contribution to future simulation based design strategy based on experimental thin film engineering for potential industrial development opportunities such as optical biometrics.}, number={1}, journal={SCIENTIFIC REPORTS}, author={Kim, Dongju and Kim, Kang Min and Han, Hyuksu and Lee, Junho and Ko, Deahyeon and Park, Kyoung Ryeol and Jang, Kyu-bong and Kim, Dongwon and Forrester, Jennifer Sue and Lee, Seung Hwan and et al.}, year={2022}, month={Jan} }