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American Association for Crystal Growth

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GROWING CRYSTALS ?<br />

CZ or Bridgeman. Resistance or Induction. Vertical or<br />

Horizontal. ZIRCAR Ceramics, Inc. works hard <strong>for</strong> you<br />

Precision CNC machined growth chamber thermal<br />

insulation in Al2O3, ZrO2 and many other compositions<br />

We Can Help Call Today<br />

The low-mass thermal insulation products<br />

offered by ZIRCAR Ceramics, Inc., have<br />

been helping crystal growers obtain high<br />

yields of quality crystals <strong>for</strong> more than<br />

35 years.<br />

Specializing in CNC-machined ZrO2,<br />

Al2O3, Al2O3-SiO2 fiber products and<br />

Microporous thermal insulation. MoSi2<br />

and resistance wire heating elements.<br />

Resistance wire heating elements <strong>for</strong> growth and<br />

annealling systems with temperatures to 1300C<br />

Vacuum <strong>for</strong>med ceramic fiber and microporous insulation<br />

<strong>for</strong> effective management of system energy issues<br />

e-mail: dph@zircarceramics.com<br />

Tel: 1 845 651 6600 ext 13<br />

www.zircarceramics.com<br />

EDITOR<br />

Candace Lynch<br />

Photonic Products Group, Inc.<br />

clynch@ppgioptics.com<br />

201-767-1910 x 583<br />

AACG newsletter<br />

AACG OFFICERS<br />

ADVERTISING EDITOR<br />

David Bliss<br />

Air Force Research Laboratory<br />

david.bliss@hanscom.af.mil<br />

781-377-4841<br />

CONTRIBUTORS<br />

Thomas F. Kuech<br />

Kenneth A. Jackson<br />

Michael Snure<br />

John Parisis<br />

Glen Kowach<br />

Volume 36, Issue 1 Spring 2011<br />

5 President’s Corner<br />

11 Obituary of Kurt Nassau – by Kenneth A.<br />

Jackson<br />

15 Observations on Chemical Aspects to<br />

Epitaxial <strong>Crystal</strong> <strong>Growth</strong> (and a Bit of<br />

History) – by Thomas F. Kuech<br />

20 ACCGE-17 Photo Contest Winners<br />

On the cover:<br />

Spiraling pine tree-like lead sulfide (PbS) nanowires<br />

are evidence of an entirely different way of growing<br />

the nanowires. Unlike the common nanowire growth<br />

mechanisms with the help of metal catalysts, the rapid<br />

elongation of the nanowire tree trunks is driven<br />

by an axial screw dislocation, which also causes the<br />

lattice of the nanowire trunks to twist (called “Eshelby<br />

Twist”) as they grow and causes their epitaxial<br />

branches to spiral. See more details in “Dislocation<br />

Driven Nanowire <strong>Growth</strong> and Eshelby Twist” Science<br />

320, 1060 (2008).<br />

Photographer: Song Jin, Department of Chemistry,<br />

University of Wisconsin-Madison.<br />

PRESIDENT<br />

Jeff Derby<br />

University of Minnesota<br />

VICE PRESIDENT<br />

Marek Skowronski<br />

Carnegie Mellon University<br />

TREASURER<br />

Dave Vanderwater<br />

Philips-Lumileds Lighting<br />

SECRETARY<br />

Joan Redwing<br />

Pennsylvania State University<br />

SECTION PRESIDENTS<br />

WEST<br />

Edith Bourret-Courchesne<br />

Lawrence Berkeley Laboratory<br />

MID-ATLANTIC<br />

Glen Kowach<br />

The City University of New York<br />

CAPITAL<br />

Ronald G. Rosemeier<br />

Brimrose<br />

NEW ENGLAND<br />

David Bliss<br />

Air Force Research Laboratory<br />

AACG EXECUTIVE ADMINISTRATOR<br />

Shoshana Nash<br />

6986 S. Wadsworth Court, Littleton, CO 80128<br />

303-539-6907 and 888-506-1271 (toll-free)<br />

303-482-2775 (fax)<br />

AACG@comcast.net<br />

AACG Newsletter Spring 2011 3

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