Thermal Synthesis of Sodium Calcium Carbonate – a Potential Thermal Analysis Standard

Johnson DR; Robb WA; Smith JW

i

Thermal Synthesis of Sodium Calcium Carbonate – a Potential Thermal Analysis Standard

Public Domain

1971/06/01
By Johnson DR ; Robb WA ; Smith JW
Series: Mining Publications

Details

Personal Author:

Johnson DR ; Robb WA ; Smith JW
Description:

Sodium calcium carbonate -- an equimolar double salt (Na2CO3·CaCO3) 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 degrees 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 degrees C. Easily prepared from common laboratory chemicals, this compound may be useful as a temperature and DTA resolution standard. [Description provided by NIOSH]
Subjects:

Calcium Compounds Chemistry Occupational Health Safety
Keywords:

Calcium-compounds Chemical-binding Chemical-composition Chemical-kinetics Chemical-properties Sodium-compounds
Series:

Mining Publications
ISSN:

0040-6031
Document Type:

Text
Genre:

Journal Article
Place as Subject:

OSHA Region 8 ; Wyoming
CIO:

National Institute for Occupational Safety and Health (NIOSH)
Division:

LERC - Laramie Energy Research Center
Topic:

Workplace Safety & Health
Location:

North America
Pages in Document:

305-312
Volume:

2
Issue:

4
NIOSHTIC Number:

nn:10010624
Citation:

Thermochim Acta 1971 Jun; 2(4):305-312
Federal Fiscal Year:

1971
Peer Reviewed:

True
Source Full Name:

Thermochimica Acta
Collection(s):

National Institute for Occupational Safety and Health
Main Document Checksum:

urn:sha-512:9cb7cb19ee8cd00009e7fbe5ed4d9912368afa9b017a1b916a08a6d07bd573198f909fcabbe812f1c7733cd276ea0fcd280124ce9f586bfa82282d5932ea8d15
Download URL:

https://stacks.cdc.gov/view/cdc/220066/cdc_220066_DS1.pdf
File Type:

[PDF - 548.25 KB ]

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