Growth of Beta-Barium Borate Crystal Via Mass Transport
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In this project, a general approach for the preparation of                      beta-barium borate and other similarly growth-constrained                       crystalline materials is investigated.  The approach is a                       modification of the Heat Exchanger Method (HEM) of crystal                      growth.  The modification imposes the necessary process control                 to crystal growth from high temperature molten salt solutions.                  The HEM allows a unique temperature distribution to be created                  within an otherwise "ideal" black body, thereby allowing mass                   transport from a nutrient zone to a growing crystal interface.                  The two independently controlled process variables operative in                 HEM allow optimization of the mass transport mechanism.  The                    method allows crystal growth to proceed without the complications               currently encountered in high temperature solution growth by slow               cooling.                                                                                                                                                        Beta-barium borate, a non-linear optical material, transforms to                the non-optically active centrosymmetric alpha-phase at 925                     degrees Celsius, before melting at 1105 degrees Celsius.  The                   non-reversible nature of this transformation imposes severe                     restrictions on the growth method and precludes single crystal                  growth directly from the melt.
{'FirstName': 'Chandra', 'LastName': 'Khattak', 'PI_MID_INIT': 'P', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Chandra P Khattak', 'EmailAddress': None, 'PI_PHON': '5087450088', 'NSF_ID': '000176692', 'StartDate': '01/01/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Crystal Systems Inc', 'CityName': 'Salem', 'ZipCode': '019705575', 'PhoneNumber': '5087450088', 'StreetAddress': '27 Congress Street', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Massachusetts', 'StateCode': 'MA', 'CONGRESSDISTRICT': '06', 'CONGRESS_DISTRICT_ORG': 'MA06', 'ORG_UEI_NUM': None, 'ORG_LGL_BUS_NAME': None, 'ORG_PRNT_UEI_NUM': None}
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{'Code': '5371', 'Text': 'SBIR Phase I'}
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