Adam J. Stevenson

Pennsylvania State University

*This is an algorithmically generated author record based on publicly available information.

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Pennsylvania State University

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Adam J. Stevenson has a total of 55 co-authors. Here are the top co-authors by number of shared publications:

Gary L. Messing
Department of Materials Science and Engineering Materials Research Institute Pennsylvania State University University Park Pennsylvania 16802
7 shared publications
Sylvain Deville
Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, 69622 Villeurbanne, France
4 shared publications
Christian Guizard
IEM - Institut Européen des membranes (1919, route de Mende - BP 5051 - 34293 Montpellier cedex 5 - France)
3 shared publications
Elizabeth C. Dickey
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, USA
3 shared publications
Elizabeth R. Kupp
Department of Materials Science and Engineering and Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802
3 shared publications
Jordi Seuba
LSFC - Laboratoire de Synthèse et Fonctionnalisation de Céramiques (550 Ave Alphonse Jauffret, F-84300 Cavaillon, France - France)
3 shared publications

Latest Publications

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Cited by 30
- 1 June 2017
- Published by Elsevier in Journal of the European Ceramic Society
Fabrication of ice-templated tubes by rotational freezing: Microstructure, strength, and permeability
by Jordi Seuba, Jerome Leloup, Stephane Richaud, Sylvain Deville, Christian Guizard, Adam J. Stevenson
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- 1 June 2017
- Published by Elsevier in Journal of the European Ceramic Society
Open Access
Fabrication of ice-templated tubes by rotational freezing: Microstructure, strength, and permeability
by Jordi Seuba, Jerome Leloup, Stephane Richaud, Sylvain Deville, Christian Guizard, Adam J. Stevenson
Cited by 30
Open Access
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Cited by 40
- 1 January 2016
- Published by Taylor & Francis in Science and Technology of Advanced Materials
Gas permeability of ice-templated, unidirectional porous ceramics
by Jordi Seuba, Sylvain Deville, Christian Guizard, Adam J. Stevenson
We investigate the gas flow behavior of unidirectional porous ceramics processed by ice-templating. The pore volume ranged between 54% and 72% and pore size between 2.9 $μ$ m and 19.1 $μ$ m. The maximum permeability ( $k_{1} = 1.39$ $\times 10^{- 11}$ m $^{2}$ ) was measured in samples with the highest total pore volume (72%) and pore size (19.1 $μ$ m). However, we demonstrate that it is possible to achieve a similar permeability ( $k_{1} = 1.09$ $\times 10^{- 11}$ m $^{2}$ ) at 54% pore volume by modification of the pore shape. These results were compared with those reported and measured for isotropic porous materials processed by conventional techniques. In unidirectional porous materials tortuosity ( $τ$ ) is mainly controlled by pore size, unlike in isotropic porous structures where $τ$ is linked to pore volume. Furthermore, we assessed the applicability of Ergun and capillary model in the prediction of permeability and we found that the capillary model accurately describes the gas flow behavior of unidirectional porous materials. Finally, we combined the permeability data obtained here with strength data for these materials to establish links between strength and permeability of ice-templated materials. Graphical Abstract
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- 1 January 2016
- Published by Taylor & Francis in Science and Technology of Advanced Materials
Open Access
Gas permeability of ice-templated, unidirectional porous ceramics
by Jordi Seuba, Sylvain Deville, Christian Guizard, Adam J. Stevenson
We investigate the gas flow behavior of unidirectional porous ceramics processed by ice-templating. The pore volume ranged between 54% and 72% and pore size between 2.9 $μ$ m and 19.1 $μ$ m. The maximum permeability ( $k_{1} = 1.39$ $\times 10^{- 11}$ m $^{2}$ ) was measured in samples with the highest total pore volume (72%) and pore size (19.1 $μ$ m). However, we demonstrate that it is possible to achieve a similar permeability ( $k_{1} = 1.09$ $\times 10^{- 11}$ m $^{2}$ ) at 54% pore volume by modification of the pore shape. These results were compared with those reported and measured for isotropic porous materials processed by conventional techniques. In unidirectional porous materials tortuosity ( $τ$ ) is mainly controlled by pore size, unlike in isotropic porous structures where $τ$ is linked to pore volume. Furthermore, we assessed the applicability of Ergun and capillary model in the prediction of permeability and we found that the capillary model accurately describes the gas flow behavior of unidirectional porous materials. Finally, we combined the permeability data obtained here with strength data for these materials to establish links between strength and permeability of ice-templated materials. Graphical Abstract
Cited by 40
Open Access
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Cited by 49
- 1 January 2016
- Published by Taylor & Francis in Science and Technology of Advanced Materials
The effect of wall thickness distribution on mechanical reliability and strength in unidirectional porous ceramics
by Jordi Seuba, Sylvain Deville, Christian Guizard, Adam J. Stevenson
Macroporous ceramics exhibit an intrinsic strength variability caused by the random distribution of defects in their structure. However, the precise role of microstructural features, other than pore volume, on reliability is still unknown. Here, we analyze the applicability of the Weibull analysis to unidirectional macroporous yttria-stabilized-zirconia (YSZ) prepared by ice-templating. First, we performed crush tests on samples with controlled microstructural features with the loading direction parallel to the porosity. The compressive strength data were fitted using two different fitting techniques, ordinary least squares and Bayesian Markov Chain Monte Carlo, to evaluate whether Weibull statistics are an adequate descriptor of the strength distribution. The statistical descriptors indicated that the strength data are well described by the Weibull statistical approach, for both fitting methods used. Furthermore, we assess the effect of different microstructural features (volume, size, densification of the walls, and morphology) on Weibull modulus and strength. We found that the key microstructural parameter controlling reliability is wall thickness. In contrast, pore volume is the main parameter controlling the strength. The highest Weibull modulus ( $m = 13.2$ ) and mean strength (198.2 MPa) were obtained for the samples with the smallest and narrowest wall thickness distribution (3.1 $μ$ m) and lower pore volume (54.5%). Graphical Abstract
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- 1 January 2016
- Published by Taylor & Francis in Science and Technology of Advanced Materials
Open Access
The effect of wall thickness distribution on mechanical reliability and strength in unidirectional porous ceramics
by Jordi Seuba, Sylvain Deville, Christian Guizard, Adam J. Stevenson
Macroporous ceramics exhibit an intrinsic strength variability caused by the random distribution of defects in their structure. However, the precise role of microstructural features, other than pore volume, on reliability is still unknown. Here, we analyze the applicability of the Weibull analysis to unidirectional macroporous yttria-stabilized-zirconia (YSZ) prepared by ice-templating. First, we performed crush tests on samples with controlled microstructural features with the loading direction parallel to the porosity. The compressive strength data were fitted using two different fitting techniques, ordinary least squares and Bayesian Markov Chain Monte Carlo, to evaluate whether Weibull statistics are an adequate descriptor of the strength distribution. The statistical descriptors indicated that the strength data are well described by the Weibull statistical approach, for both fitting methods used. Furthermore, we assess the effect of different microstructural features (volume, size, densification of the walls, and morphology) on Weibull modulus and strength. We found that the key microstructural parameter controlling reliability is wall thickness. In contrast, pore volume is the main parameter controlling the strength. The highest Weibull modulus ( $m = 13.2$ ) and mean strength (198.2 MPa) were obtained for the samples with the smallest and narrowest wall thickness distribution (3.1 $μ$ m) and lower pore volume (54.5%). Graphical Abstract
Cited by 49
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Cited by 58
- 12 May 2014
- Published by Wiley in Journal of the American Ceramic Society
Templated Grain Growth in Macroporous Materials
by Florian Bouville, Etienne Portuguez, Yunfei Chang, Gary L. Messing, Adam J. Stevenson, Eric Maire, Loic Courtois, Sylvain Deville
We demonstrate a facile method to produce crystallographically textured, macroporous materials using a combination of modified ice templating and templated grain growth (TGG). The process is demonstrated on alumina and the lead‐free piezoelectric material sodium potassium niobate. The method provides macroporous materials with aligned, lamellar ceramic walls which are made up of crystallographically aligned grains. Each method showed that the ceramic walls present a long‐range order over the entire sample dimensions and have crystallographic texture as a result of the TGG process. We also present a modification of the March–Dollase equation to better characterize the overall texture of materials with textured but slightly misaligned walls. The controlled crystallographic and morphologic orientation at two different length scales demonstrated here can be the basis of multifunctional materials.
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- 12 May 2014
- Published by Wiley in Journal of the American Ceramic Society
Templated Grain Growth in Macroporous Materials
by Florian Bouville, Etienne Portuguez, Yunfei Chang, Gary L. Messing, Adam J. Stevenson, Eric Maire, Loic Courtois, Sylvain Deville
We demonstrate a facile method to produce crystallographically textured, macroporous materials using a combination of modified ice templating and templated grain growth (TGG). The process is demonstrated on alumina and the lead‐free piezoelectric material sodium potassium niobate. The method provides macroporous materials with aligned, lamellar ceramic walls which are made up of crystallographically aligned grains. Each method showed that the ceramic walls present a long‐range order over the entire sample dimensions and have crystallographic texture as a result of the TGG process. We also present a modification of the March–Dollase equation to better characterize the overall texture of materials with textured but slightly misaligned walls. The controlled crystallographic and morphologic orientation at two different length scales demonstrated here can be the basis of multifunctional materials.
Cited by 58
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Cited by 25
- 20 August 2013
- Published by Wiley in Journal of the American Ceramic Society
Parasitic Light Absorption Processes in Transparent Polycrystalline MgAl ₂ O ₄ and YAG
by Adrian Goldstein, Alexander. I. Shames, Adam J. Stevenson, Zvi Cohen, Marina Vulfson
Parasitic radiation absorption by impurities located in transparent polycrystalline ceramic hosts may significantly impair their functioning. At least two classes of impurity which can act as parasitic absorbers were encountered: transition or rare‐earth metal cations and neutral species (molecules or atoms) trapped in lattice void spaces. The most ubiquitous parasitic absorbers, able to affect transmission in the visible domain, have been identified for the case of MgAl ₂ O ₄ ‐spinel and Y ₃ Al ₅ O ₁₂ ‐garnet hosts; their spectral effect was described and explained. In the case of spinel, S ₈ type molecules and carbon atom clusters are the most damaging impurities, with Ce ³⁺ and Y ²⁺ also of significance for YAG host. Oxygen vacancy formation assists some of the redox processes which generate uncontrolled absorption. For instance, the Ti ⁴⁺ reduction to Ti ³⁺ is facilitated by such a process.
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- 20 August 2013
- Published by Wiley in Journal of the American Ceramic Society
Parasitic Light Absorption Processes in Transparent Polycrystalline MgAl ₂ O ₄ and YAG
by Adrian Goldstein, Alexander. I. Shames, Adam J. Stevenson, Zvi Cohen, Marina Vulfson
Parasitic radiation absorption by impurities located in transparent polycrystalline ceramic hosts may significantly impair their functioning. At least two classes of impurity which can act as parasitic absorbers were encountered: transition or rare‐earth metal cations and neutral species (molecules or atoms) trapped in lattice void spaces. The most ubiquitous parasitic absorbers, able to affect transmission in the visible domain, have been identified for the case of MgAl ₂ O ₄ ‐spinel and Y ₃ Al ₅ O ₁₂ ‐garnet hosts; their spectral effect was described and explained. In the case of spinel, S ₈ type molecules and carbon atom clusters are the most damaging impurities, with Ce ³⁺ and Y ²⁺ also of significance for YAG host. Oxygen vacancy formation assists some of the redox processes which generate uncontrolled absorption. For instance, the Ti ⁴⁺ reduction to Ti ³⁺ is facilitated by such a process.
Cited by 25
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Cited by 78
- 1 April 2012
- Published by Elsevier in Optical Materials
Effect of Yb3+ concentration on optical properties of Yb:CaF2 transparent ceramics
by Andréas Lyberis, Adam J. Stevenson, Akiko Suganuma, Sandrine Ricaud, Frédéric Druon, Frédéric Herbst, Daniel Vivien, Patrick Gredin, Michel Mortier
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- 1 April 2012
- Published by Elsevier in Optical Materials
Effect of Yb3+ concentration on optical properties of Yb:CaF2 transparent ceramics
by Andréas Lyberis, Adam J. Stevenson, Akiko Suganuma, Sandrine Ricaud, Frédéric Druon, Frédéric Herbst, Daniel Vivien, Patrick Gredin, Michel Mortier
Cited by 78
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Cited by 135
- 1 December 2011
- Published by Elsevier in Journal of Fluorine Chemistry
Fluoride materials for optical applications: Single crystals, ceramics, glasses, and glass–ceramics
by Adam J. Stevenson, Hélène Serier-Brault, Patrick Gredin, Michel Mortier
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- 1 December 2011
- Published by Elsevier in Journal of Fluorine Chemistry
Fluoride materials for optical applications: Single crystals, ceramics, glasses, and glass–ceramics
by Adam J. Stevenson, Hélène Serier-Brault, Patrick Gredin, Michel Mortier
Cited by 135
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Cited by 62
- 28 April 2011
- Published by Springer Nature in Journal of Materials Research
Low temperature, transient liquid phase sintering of B₂O₃-SiO₂-doped Nd:YAG transparent ceramics
by Adam J. Stevenson, Elizabeth R. Kupp, Gary L. Messing
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- 28 April 2011
- Published by Springer Nature in Journal of Materials Research
Low temperature, transient liquid phase sintering of B₂O₃-SiO₂-doped Nd:YAG transparent ceramics
by Adam J. Stevenson, Elizabeth R. Kupp, Gary L. Messing
Cited by 62
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Cited by 4
- 10 February 2011
- Published by SPIE-Intl Soc Optical Eng
Last advances in Yb³⁺doped CaF 2 ceramics synthesis
by Michel Mortier, Andréas Lyberis, Akiko Suganuma, Adam Stevenson, Daniel Vivien, Patrick Gredin, Gilles Patriarche
One at% Yb:CaF₂ transparent ceramics for high power lasers are obtained by vacuum sintering and hot pressing nanoparticles synthesized through a soft chemistry route. The residual optical losses of these ceramics are as low as 0.09 cm^-1 (corresponding to an in-line transmittance of 96.7%) at 1200 nm. Densification during sintering is limited by large voids, but pressure assisted densification after sintering results in high optical quality transparent ceramics. Absorption spectra are similar to Yb:CaF₂ single crystal, and the fluorescence lifetime was measured to be 2 ms in the wavelength 1010 to 1050 nm range. The 1 at% Yb:CaF2 transparent ceramics successfully produced laser oscillation at 1031 nm when placed in an Omega-type laser cavity under 970 nm diode laser pumping.
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- 10 February 2011
- Published by SPIE-Intl Soc Optical Eng
Last advances in Yb³⁺doped CaF 2 ceramics synthesis
by Michel Mortier, Andréas Lyberis, Akiko Suganuma, Adam Stevenson, Daniel Vivien, Patrick Gredin, Gilles Patriarche
One at% Yb:CaF₂ transparent ceramics for high power lasers are obtained by vacuum sintering and hot pressing nanoparticles synthesized through a soft chemistry route. The residual optical losses of these ceramics are as low as 0.09 cm^-1 (corresponding to an in-line transmittance of 96.7%) at 1200 nm. Densification during sintering is limited by large voids, but pressure assisted densification after sintering results in high optical quality transparent ceramics. Absorption spectra are similar to Yb:CaF₂ single crystal, and the fluorescence lifetime was measured to be 2 ms in the wavelength 1010 to 1050 nm range. The 1 at% Yb:CaF2 transparent ceramics successfully produced laser oscillation at 1031 nm when placed in an Omega-type laser cavity under 970 nm diode laser pumping.
Cited by 4
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Cited by 30
- 31 January 2011
- Published by AIP Publishing in Applied Physics Letters
Color center formation in vacuum sintered Nd3xY3−3xAl5O12 transparent ceramics
by Adam J. Stevenson, Brad C. Bittel, Christopher G. Leh, Xin Li, Elizabeth C. Dickey, Patrick M. Lenahan, Gary L. Messing
Color center formation was studied in vacuum sintered ${Nd}_{3 x} Y_{3 - 3 x} {Al}_{5} O_{12}$ transparent ceramics. The primary color centers were F- and $F^{+}$ -centers as evidenced by optical absorption in the 250–400 nm wavelength range and the presence of an electron spin resonance (ESR) line at $g = 1.9977$ . Annealing in air at $1600 ° C$ for 10 h reduced the number of color centers to below the detection limit of ESR. Color center formation is controlled by oxidation and reduction of ${Fe}^{2 + / 3 +}$ impurities.
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- 31 January 2011
- Published by AIP Publishing in Applied Physics Letters
Color center formation in vacuum sintered Nd3xY3−3xAl5O12 transparent ceramics
by Adam J. Stevenson, Brad C. Bittel, Christopher G. Leh, Xin Li, Elizabeth C. Dickey, Patrick M. Lenahan, Gary L. Messing
Color center formation was studied in vacuum sintered ${Nd}_{3 x} Y_{3 - 3 x} {Al}_{5} O_{12}$ transparent ceramics. The primary color centers were F- and $F^{+}$ -centers as evidenced by optical absorption in the 250–400 nm wavelength range and the presence of an electron spin resonance (ESR) line at $g = 1.9977$ . Annealing in air at $1600 ° C$ for 10 h reduced the number of color centers to below the detection limit of ESR. Color center formation is controlled by oxidation and reduction of ${Fe}^{2 + / 3 +}$ impurities.
Cited by 30

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