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A Gateway for High-Pressure Scientists to Beamlines of the APS

Ferroelectrics: Enhanced Ferroelectric and Visible-Light Photoelectric Properties in Multiferroic KBiFe2O5 via Pressure-Induced Phase Transition
Ferroelectrics: Enhanced Ferroelectric and Visible-Light Photoelectric Properties in Multiferroic KBiFe2O5 via Pressure-Induced Phase Transition
New study from a team of HPSTAR scientists, led by Drs. Ganghua Zhang and Wenge Yang, find that pressure can simultaneously enhance ferroelectric and photoelectric properties of multiferroic KBiFe2O5. These findings may open a new avenue to discovering and designing optimal ferroelectric compounds for solar energy applications. The work was highlighted on the Advanced Electronic Materials cover inside. More...

Stability of Ar(H2)2 to 358 GPa
Stability of Ar(H2)2 to 358 GPa Hydrogen-rich materials have been predicted to be promoters for the metallization of hydrogen. A group of scientists led by HPSTAR director, Dr. Ho-kwang Mao has studied Ar(H2)2, a hydrogen-rich material formed by Argon (Ar) and Hydrogen (H2), to 358 gigapascals— almost the pressure in the inner core of the Earth, by combining experimental and theoretical methods. Contrary to the previous thought, it was observed that Ar damps the intermolecular interactions between H2 molecules, an effect as ‘negative’ chemical pressure which postpones metallization. The results were published in Proceeding of the National Academic of Sciences, USA. More...

Dehydrogenation of goethite in Earth’s deep lower mantle
The hydrogen cycling in the deep Earth. Image courtesy Qingyang Hu.
In Earth interior, water (H2O) plays an important role in rock physics but geoscientists rarely treat water in its decomposable forms, like hydrogen plus oxygen. However, new work from a team led by HPSTAR director, Dave Mao, has identified the hydrogen can escape from the water under lower mantle conditions. Their results were published in Proceeding of the National Academic Science, U.S.A.More...

The origin of ultrahigh piezoelectricity in relaxor-ferroelectric solid solution crystals.
The origin of uptrahigh piezoelectricity in relaxor-ferroelectric solid solution crystals
Over last 60 years, efforts to enhance piezoelectricity generally resort to tuning the long-range ferroelectric phase transition. In the work published in the recent issue of Nature Communications (doi:10.1038/ncomms13807), the researchers revealed that small amount of nanoscale local inhomogeneity may dramatically improve the piezoelectric responses (50-80%) of a ferroelectric crystal.More...

Pressure-Induced Bandgap Optimization in Lead-Based Perovskites with Prolonged Carrier Lifetime and Ambient Retainability
Pressure-Induced Bandgap Optimaization in Lead-Based Perovskites with Prolonged Carrier Lifetime and Ambient Retainability
For the first time, scientists have reached the Shockley-Queisser theory optimized bandgap for single-junction solar cells in lead-based perovskites. A new study led by HPSTAR scientists Dr.Gang Liu and Dr. Dave Mao, report an unprecedentedly tuned bandgap of the Shockley–Queisser limit and double-prolonged carrier lifetime in formamidinium lead triiodide (HC(NH2)2PbI3) in the latest issue of Advanced Functional Materials (DOI: 10.1002/adfm.201604208).More...

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