From: halmos.ferenc@upcmail.hu

Sent: Sunday, February 05, 2012 4:37 AM

To: 'Phil Hamling'

Subject: RE: Trying to understand molybdenum crystals

Phil,

Sorry I have no thislike curves.

As I know the vaporasing effect of the oxides are the highest int he case of the following materials:

MoO3

PbO

CuO

Na2O

K2O

B2O3

Cr2O3

CdO

The most sensitive is the Mo, the less is the CdO in this row.

The most visible effect I become int he case of Cr2O3. If you fire  1 piece of chromium colored vase in your kiln all the other white high titan containing glazes turns to bright yellow. This effect remains at the following

2-4 firings too !!!!

I made only few experiments with MoO3 because

- i did not found it effective enough in the case of Zn crystalls

-glaze faults

-the danger of selfpoisoning with Moly vapors

The Zn vaporis highly only in metallic reduced form, the oxide not to strongly

Feri

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From: Phil Hamling [mailto:pdah@optonline.net]
Sent: Sunday, February 05, 2012 1:31 AM
To: halmos.ferenc@upcmail.hu
Subject: FW: Trying to understand molybdenum crystals

Feri,

I'm sorry. It would probably help to attach the curve.

Phil

From: Phil Hamling [mailto:pdah@optonline.net]
Sent: Saturday, February 04, 2012 6:55 PM
To: Ferenc Halmos (hafe@fibermail.hu)
Subject: Trying to understand molybdenum crystals

Feri,

A friend of mine sent this curve showing the vapor pressure of molybdenum trioxide. Do you know how similar curves for common volatile oxides involved in ceramic glazes appear  (zinc oxide, sodium oxide, etc.)?

Phil Hamling

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