Featured Research

from universities, journals, and other organizations

A baby crystal is born

Date:
January 23, 2012
Source:
American Institute of Physics
Summary:
Scientists determine the smallest possible cubic lead sulfide cluster that exhibits the same coordination (a key structural property) as bigger bulk crystals.

Lead sulfide (PbS) forms when an equal number of lead and sulfur atoms exchange electrons and bond together in cubic crystals. Now scientists have determined that a structure comprising 32 lead-sulfur pairs is the smallest possible cubic arrangement that exhibits the same coordination as bulk lead sulfide. (The coordination number is the number of nearest neighbors each atom in the crystal has.)

Researchers from McNeese State University in Louisiana, John Hopkins University in Maryland, and the University of Konstanz in Germany identified the "baby crystal" by running computer simulations that calculated the energy and geometry of different structures containing different numbers of atoms.

They found that (PbS)32 is the smallest stable unit that possesses both the same cubic structure and coordination number as the bulk crystal.

The researchers also experimentally tested their theoretical findings by gently depositing (PbS)32 clusters on a graphite surface where they could easily migrate and merge together to form larger nanoscale structures. By using scanning tunneling microscope images to measure the dimensions of the resultant lead sulfide nano-blocks, the researchers confirmed that the (PbS)32 "baby crystals" had indeed stacked together as theoretically predicted.

The results, published in the AIP's Journal of Chemical Physics, show how small lead sulfide crystals come together to form larger units and could help provide a better understanding of the mechanisms involved in the formation of solids.


Story Source:

The above story is based on materials provided by American Institute of Physics. Note: Materials may be edited for content and length.


Journal Reference:

  1. B. Kiran, Anil K. Kandalam, Rameshu Rallabandi, Pratik Koirala, Xiang Li, Xin Tang, Yi Wang, Howard Fairbrother, Gerd Gantefoer, Kit Bowen. (PbS)32: A baby crystal. The Journal of Chemical Physics, 2012; 136 (2): 024317 DOI: 10.1063/1.3672166

Cite This Page:

American Institute of Physics. "A baby crystal is born." ScienceDaily. ScienceDaily, 23 January 2012. <www.sciencedaily.com/releases/2012/01/120118111212.htm>.
American Institute of Physics. (2012, January 23). A baby crystal is born. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2012/01/120118111212.htm
American Institute of Physics. "A baby crystal is born." ScienceDaily. www.sciencedaily.com/releases/2012/01/120118111212.htm (accessed July 23, 2014).

Share This




More Matter & Energy News

Wednesday, July 23, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Robot Parking Valet Creates Stress-Free Travel

Robot Parking Valet Creates Stress-Free Travel

AP (July 23, 2014) 'Ray' the robotic parking valet at Dusseldorf Airport in Germany lets travelers to avoid the hassle of finding a parking spot before heading to the check-in desk. (July 23) Video provided by AP
Powered by NewsLook.com
Boeing Ups Outlook on 52% Profit Jump

Boeing Ups Outlook on 52% Profit Jump

Reuters - Business Video Online (July 23, 2014) Commercial aircraft deliveries rose seven percent at Boeing, prompting the aerospace company to boost full-year profit guidance- though quarterly revenues missed analyst estimates. Bobbi Rebell reports. Video provided by Reuters
Powered by NewsLook.com
Europe's Car Market on the Rebound?

Europe's Car Market on the Rebound?

Reuters - Business Video Online (July 23, 2014) Daimler kicks off a round of second-quarter earnings results from Europe's top carmakers with a healthy set of numbers - prompting hopes that stronger sales in Europe will counter weakness in emerging markets. Hayley Platt reports. Video provided by Reuters
Powered by NewsLook.com
9/11 Commission Members Warn of Terror "fatigue" Among American Public

9/11 Commission Members Warn of Terror "fatigue" Among American Public

Reuters - US Online Video (July 22, 2014) Ten years after releasing its initial report, members of the 9/11 Commission warn of the "waning sense of urgency" in combating terrorists attacks. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins