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Thermal synthesis of sodium calcium carbonate -- a potential thermal analysis standard.

Authors
Smith-JW; Johnson-DR; Robb-WA
Source
Thermochim Acta 1971 Jun; 2(4):305-312
NIOSHTIC No.
10010624
Abstract
Sodium calcium carbonate -- an equimolar double salt (Na2CO3ĚCaCO3) never described in the literature -- forms by a novel solid state reaction when intimately mixed Na2CO3 and CaCO3 powders are heated. The thermal synthesis and the properties of this compound are evaluated by thermal analysis using an instrument yielding simultaneous DTA, TG, and EGA data. The compound forms slowly at temperatures above 300░C with no gas evolution and no weight loss. This product's X-ray diffraction pattern, unique and reproducible, is not included in the ASTM X-ray data card file. Stable at room temperature, the compound undergoes four crystal inversions in the temperature range from 390 to 450░C. Easily prepared from common laboratory chemicals, this compound may be useful as a temperature and DTA resolution standard.
Keywords
Chemical-binding; Chemical-composition; Chemical-kinetics; Chemical-properties; Sodium-compounds; Calcium-compounds
CODEN
THACAS
Publication Date
19710601
Document Type
OP; Journal Article
Fiscal Year
1971
NTIS Accession No.
NTIS Price
Identifying No.
OP 118-71
Issue of Publication
4
ISSN
0040-6031
NIOSH Division
LERC
Source Name
Thermochimica Acta
State
WY
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