SAN FRANCISCO Claude Giroux Womens Jersey , June 19 (Xinhua) -- Research on heterostructuralalloys, built with materials of different structures, holds thepromise that their properties could be subject to greater controland that they could be better semiconductors.

While conventional alloys are isostructural, meaning thecompounds they consist of Wayne Simmonds Womens Jersey , known as the end members, have the samecrystal structure, heterostructural alloys are blends of compoundsmade from materials that don't share the same atom arrangement.

Structure and composition are the two means of controlling thebehavior of materials, said study co-author Janet Tate Nolan Patrick Womens Jersey , a physicistat Oregon State University (OSU). Combining materials gives thealloy properties between those that the end members haveindividually.

"An example of an istostructural alloy is an LED," she noted,"you have a semiconductor like aluminum gallium arsenide, dope itwith a particular material and make it emit light Adidas Jakub Voracek Jersey , and change thecolor of the light by changing the relative concentration ofaluminum and gallium."

However, "if two materials have different structures, as you mixthem together it's not so clear which structure will win," Tate Adidas Shayne Gostisbehere Jersey ,who worked with collaborators and published their findings inScience Advances, was quoted as saying in a news release from OSUon Monday.

"The two together want to take different structures, and so thisis an extra way of tuning an alloy's properties, a structural way.The transition between different crystal structures provides anadditional degree of control Adidas Claude Giroux Jersey ," Tate said.

Tate and graduate student Bethany Matthews have been focusing onthe semiconductor application. "Tin sulfide is a solar cellabsorber, and the addition of calcium sulfide changes the structureand therefore the electrical properties necessary for an absorber,"Tate said.

"Combining tin sulfide with calcium sulfide makes it moreisotropic - properties being the same regardless of orientation -and that's usually a useful thing in devices."

In addition, as a result of the study Adidas Wayne Simmonds Jersey , thin-film synthesisconfirmed the metastable phases of the alloys that had beenpredicted theoretically. "Many alloys are metastable, not stable -if you gave them enough time and temperature, they'd eventuallyseparate," said Tate.

"The way we make them Adidas Nolan Patrick Jersey , with pulsed laser deposition, we allowthe unstable structure to form, then suppress the decompositionpathways that would allow them to separate; we don't give themenough time to equilibrate."

Metastable materials are thermodynamically stable provided theyare not subjected to large disturbances.

"When theorists predict properties, they tend to work withmaterials that are stable Authentic Jakub Voracek Jersey ," Tate said. "In general the stablecompounds are easier to attack. The idea here with heterostructuralalloys is that they give us a new handle, a new knob to turn tochange and control materials' properties."

"This is a very interesting piece of materials science thatrepresents a somewhat uncharted area and it may be the beginningsomething quite important," she said about her research supportedby the U.S. Department of Energy.

"The heterostructural alloy concept had been known before, butit's different enough that it hadn't really been explored in adetailed phase diagram - the mapping of exactly how Authentic Shayne Gostisbehere Jersey , at whattemperature and what concentration, it goes from one structure toanother," she added. Enditem

AMMAN， March 8 (Xinhua) -- Jordan and the Palestinian Liberation Organization (PLO) stressed on Wednesday that there is no alternative to the two-state solution in ending the Palestinian-Israeli conflict and achieving peace in the Middle East， state-run Petra news agency reported.

At a meeting between Jordanian Foreign Minister Ayman Safadi and Secretary General of the Executive Committee of the PLO Saeb Erekat， they emphasized that terrorists may take advantage of the despair brought by the lack of progress toward the peaceful solution that can end occupation and lead to the creation of an independent Palestinian state.

Both sides called for more efforts to renew serious negotiations to realize the Palestinians' legitimate right to statehood based on the borders of 1967 with east Jerusalem as its capital.

Erekat and Safadi warned against any unilateral moves that change the status quo in east Jerusalem and alter its Arabic identity.

They said the peace on the basis of the two-state solution is a strategic option that is in line with the Arab Peace initiative， which was adopted by the Arab states in 2002.

by Will Koulouris

SYDNEY， March 6 (Xinhua) -- China's science and technology sector has been surging forward rapidly over the past decade， according to a leading Australian scientist.

Professor Andrew Dempster， director of the Australian Centre for Space Engineering Research at the University of New South Wales told Xinhua in a recent interview that specific examples， such as the BeiDou navigation satellite system， demonstrate China's strong commitment to science.

"In the last few decades we've seen significant advancements coming out of China，" Dempster said.

"For a long time GPS and GLONASS were the only satellite navigation systems around， but now the BeiDou system coming out of China is growing very rapidly."

Dempster said the satellite system， currently serving the Asian region， will be ready for global deployment soon， utilizing the BeiDou-2 and BeiDou-3 satellites.

"It's been quite a rapid deployment， and it is very impressive the way China has gone about doing that."

Although satellite navigation is Dempster's area of specific expertise， he is well versed in space technology， and is very impressed with recent technological advances coming out of China's space sector.

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